List of Supergirl episodes

Supergirl is an American superhero action-adventure drama television series developed by Ali Adler, Greg Berlanti, and Andrew Kreisberg, based on the DC Comics character Supergirl, created by Otto Binder and Al Plastino, that originally aired on CBS and premiered on October 26, 2015. Supergirl is a costumed superheroine who is the biological cousin to Superman and one of the last surviving Kryptonians. The series was officially picked up on May 6, 2015, and received a full season order on November 30, 2015. The series moved from CBS to The CW from its second season onwards.

During the course of the series, 20 episodes of Supergirl aired, between October 26, 2015, and November 9, 2021.

Episodes

Season 1 (2015–16)

Main article: Supergirl season 1

Supergirl, season 1 episodes

No. overall	No. in season	Title	Directed by	Written by	Original air date	Prod. code	U.S. viewers (millions)
1	1	"Pilot"	Glen Winter	Story by: Greg Berlanti & Ali Adler & Andrew Kreisberg Teleplay by: Ali Adler	October 26, 2015 (2015-10-26)	276088	12.96
Cousins Kal-El and Kara Zor-El are sent to Earth before Krypton's impending destruction. The planet's implosion forces Kara's ship off course and into the Phantom Zone for 24 years, before landing on Earth. Kal, now operating as the superhero Superman in Metropolis, puts Kara in the care of the Danvers in National City. Twelve years later, Kara, working at CatCo Worldwide Media, reveals her powers as a vigilante. She tells her co-worker, Winn Schott, about her secret and he starts aiding her. Her cold-hearted boss, Cat Grant, titles the vigilante "Supergirl". Alex, Kara's adoptive sister, works at the Department of Extranormal Operations (DEO), under the leadership of Hank Henshaw, investigating alien activity. Kara learns that there are hundreds of aliens on Earth, most of whom came from a prison that was run by her mother, Alura. Her actions attract the attention of an alien called Vartox, and she is able to defeat him, although he then kills himself. James Olsen, another one of Kara's colleagues, reveals that Kal sent him to look after her and presents her with a new cape. Vartox's superior is revealed to be Astra In-Ze, Alura's identical twin sister, who wants to conquer Earth.
2	2	"Stronger Together"	Glen Winter	Story by: Greg Berlanti & Andrew Kreisberg Teleplay by: Andrew Kreisberg & Ali Adler	November 2, 2015 (2015-11-02)	4X7602	8.87
In an effort to put a positive image on Supergirl in the wake of a serious mishap, Kara asks Winn and James to help her perfect her skills, while Hank and Alex put Kara through extensive physical training. Kara learns that an alien of the Hellgrammite species who escaped from Fort Rozz, Alura's prison, is on Earth searching for chlorine-based food. The DEO prepares an ambush for the Hellgrammite, but it escapes, kidnaps Alex, and takes her to Astra, who uses Alex as a trap for Kara. As Kara and Astra fight, Hank injures Astra with a Kryptonite knife and Alex kills the Hellgrammite. Learning that Kara has become more powerful than she had imagined and that humanity has a means of weakening Kryptonians, Astra muses that her "plans" may need to be postponed. Alex provides Kara with an interactive artificial intelligence of Alura's consciousness. Meanwhile, Cat pressures James to get her an interview with Supergirl. In the end, Kara agrees to the interview and prevents James from getting fired. It is also revealed that Hank might have a secret of his own when his eyes glow red.
3	3	"Fight or Flight"	Dermott Downs	Michael Grassi & Rachel Shukert	November 9, 2015 (2015-11-09)	4X7603	8.07
During the interview with Cat, Kara accidentally reveals that she is Superman's cousin. After Cat exposes the relationship, Kara is attacked by Reactron, who seeks to kill her in order to get his revenge on Superman, but she manages to send him fleeing. He later goes to LORD Technology labs and kidnaps Maxwell Lord to get him to fix his suit. Kara later learns that a reactor meltdown Superman stopped in the past killed Reactron's wife. She goes to the hideout of Reactron, identified as Ben Krull, and manages to save Maxwell, only to get badly injured by Krull afterwards, but Superman comes to save her. She gets mad at James for calling Superman for help. During a party Cat organized, Krull breaks in to find Supergirl. While James distracts Reactron, Kara covers her hand in lead so that she can use it to safely remove the power core in Krull's suit and defeat him. Kara, who has feelings for James, witnesses his ex-girlfriend, Lucy Lane, also Lois Lane's younger sister, paying him a visit to restart their relationship.
4	4	"How Does She Do It?"	Thor Freudenthal	Yahlin Chang & Ted Sullivan	November 23, 2015 (2015-11-23)	4X7604	7.19
Cat leaves town, entrusting her son Carter to Kara. A bomber starts targeting Lord's company. On the opening night of Lord's new bullet train, Kara and the DEO find out about two bomb threats simultaneously, one at the airport and one on the train. The DEO goes to the airport, where Hank secretly uses his powers to deactivate the bomb. Kara goes to the train to save Carter, who is on it with the bomber. As she confronts the bomber, he claims that he is doing it for his daughter. He requests her to save the people on the train after he starts the timer, killing himself. At DEO headquarters, Alex finds a fail-safe in the bomb defused by Hank, who claimed it was just a decoy. Kara deduces that Lord was the one behind the bombings. As Supergirl, she confronts Lord, who implies that the threats were used to test her skills. He also vows to find the person important to her on the train. Meanwhile, James initially refuses to date Lucy, but Kara convinces him to return to her.
5	5	"Livewire"	Kevin Tancharoen	Roberto Aguirre-Sacasa & Caitlin Parrish	November 16, 2015 (2015-11-16)	4X7605	7.77
After fighting an alien escapee, Kara meets Alex at the apartment to greet the latter's mother, Eliza, for Thanksgiving, inviting Winn due to his lack of plans. CatCo's shock jock, Leslie Willis is demoted by Cat to traffic reporting after a controversial bashing of Supergirl. During a severe thunderstorm, Kara tries to save Leslie, but lightning strikes them both, imbuing Leslie with electromagnetic powers. Leslie takes the name "Livewire" and tries to take revenge on Cat, but Kara eventually stops her and she is imprisoned at the DEO. Cat and Kara become closer. Meanwhile, Alex tells Eliza in a fit of rage at the dinner table that she's actually working for the DEO. Eliza reveals to Alex and Kara that her husband, Jeremiah, offered himself up to work for Henshaw in exchange for Kara's safety and then died mysteriously. Alex and Kara decide to investigate Henshaw and find the truth about Jeremiah's death.
6	6	"Red Faced"	Jesse Warn	Michael Grassi & Rachel Shukert	November 30, 2015 (2015-11-30)	4X7606	8.02
Kara hurts a civilian due to her uncontrolled anger. Sam Lane, Lucy's father and also a military general, arrives at the DEO with her as his attache, demanding Supergirl let them test her powers by fighting an android called Red Tornado, which is invented by T.O. Morrow. She overpowers Red Tornado, leading to Sam firing Morrow. Sam is later attacked by Red Tornado, but Kara saves him. The DEO realizes that Red Tornado is actually a drone controlled by Morrow. Alex and Kara engage Morrow and Red Tornado, respectively. Alex kills Morrow, making Red Tornado engage Kara without control. She uses her heat vision at full force to destroy it. Lucy resigns from military service in order to stay with James. Kara finds out that her powers have diminished when she cuts herself and starts bleeding. Meanwhile, Winn informs Kara and Alex that Jeremiah and Hank went on a mission in South America, where Jeremiah died, deducing that Hank is the last person to have seen him alive.
7	7	"Human for a Day"	Larry Teng	Yahlin Chang & Ted Sullivan	December 7, 2015 (2015-12-07)	4X7607	7.67
As Kara tries to adapt to life without her powers, an earthquake hits National City. Winn informs Kara that she needs a rise of adrenalin in her blood to regain her powers. The team begins saving the CatCo staff upstairs by the elevator shaft, from where James falls after saving everyone. Kara regains her powers and saves him before rushing to help the citizens. Winn becomes jealous of the intimacy between her and James. Afterwards, Kara is attacked by Astra and her operatives. Meanwhile, the earthquake causes a DEO prisoner called Jemm, who has psychic abilities to read and control minds, to escape. Hank locks the facility and takes a team to engage Jemm, with the former being the only survivor. This causes Alex to become more suspicious of Hank. She locks him in a room and engages Jemm alone, being overpowered, but Hank arrives in time and kills him. He explains to her that he is the sole survivor of an alien species and his name is J'onn J'onzz. The real Hank Henshaw died after killing Jeremiah, who had turned against him to protect J'onn, who assumed Hank's shape and identity.
8	8	"Hostile Takeover"	Karen Gaviola	Roberto Aguirre-Sacasa & Caitlin Parrish	December 14, 2015 (2015-12-14)	4X7608	7.28
Kara is overpowered by Astra and escapes. In a second duel, the former defeats the latter and brings her to the DEO, where the latter states that all she wanted was to save Krypton, the same thing she wants for Earth. She also reveals that Alura used Kara on Krypton to arrest the former. Kara confronts the interactive artificial intelligence of Alura, who refuses to confirm that Astra's plan could have worked. It is revealed that Astra wanted to get arrested in order to divert attention from her husband, Non, and his team from attacking LORD Technologies. Kara rushes there and engages him. Meanwhile, Cat's emails are hacked and her personal information is leaked to the press. Kara finds out that the chairman of the board was behind the hack and provides Cat with evidence by the help of James, Lucy and Winn, leading to the chairman's arrest. Kara also finds out from the leaks that Cat has a 24-year-old son named Adam Foster. Cat reveals to Kara that she has found out about the latter's alter ego.
9	9	"Blood Bonds"	Steve Shill	Ted Sullivan & Derek Simon	January 4, 2016 (2016-01-04)	4X7609	8.75
Non overpowers Kara and leaves with Hank. Lord sends the DEO away from his facility, vowing to defend it himself, and returns to a secret experiment he is conducting. Non offers to trade Hank for Astra, but Sam, who is placed in charge of the DEO by the President, refuses. He tortures Astra for Non's location, and walks into a trap placed by Non. Kara is distraught over both her defeat and the fact that Cat will fire her unless she is convinced that Kara is not Supergirl. Kara goes to the DEO and talks with Astra who tells her that Alura believed her claim that Krypton was doomed, but sentenced her for her illegal methods while promising to work for her cause. Alex and Kara make the trade over Lane's objections and Astra orders Non to withdraw despite his numerical advantage. Sam and his men leave the DEO. Hank uses his shape-shifting power to present Cat with Kara and Supergirl simultaneously, casting doubt on her initial deduction of their identities. Kara, James and Winn decide to find the secret about Lord, who is shown in possession of an alien woman.
10	10	"Childish Things"	Jamie Babbit	Story by: Yahlin Chang Teleplay by: Anna Musky-Goldwyn & James DeWille	January 18, 2016 (2016-01-18)	4X7610	8.77
Winn's father, known as the Toyman, escapes from prison, leaving the former a message to meet him. Winn tells the FBI about it. They find it a trap, but Kara saves them. Winn reveals that his father's boss, Chester Dunholtz, stole his toy designs, leading to the Toyman trying to kill Dunholtz, killing other people instead and going to jail. The Toyman kidnaps Winn, demanding him to attend a ceremony to kill Dunholtz and threatening to kill the other guests by the bombs he has planted. Kara manages to save the guests and have the Toyman arrested. Lucy accepts Cat's job offer and Winn addresses his feelings to Kara. Meanwhile, Alex goes to dinner with Maxwell, giving Hank the chance to infiltrate LORD Technologies by shapeshifting into Maxwell. He finds the woman and takes pictures, but is forced to clear a security guard's memory to escape without arousing suspicion. Maxwell is revealed to be monitoring Alex using a camera and microphone he planted on her purse. He finds out about Supergirl's identity.
11	11	"Strange Visitor from Another Planet"	Glen Winter	Michael Grassi & Caitlin Parrish	January 25, 2016 (2016-01-25)	4X7611	7.90
Miranda Crane, an anti-alien Senator, arrives in National City and is attacked by an alien. Kara saves Crane and brings her to the DEO, where Hank reveals to Alex that the alien is a White Martian, whose species wiped out the Green Martians, Hank's species. Kara finds out that the Crane inside the DEO is actually the White, who is a shapeshifter. The White escapes, abducting Alex. Hank proposes a trade of himself with Alex, which the White accepts. Kara interrupts the exchange, giving Hank the chance to attempt to kill the White, but Kara dissuades him and the White is incarcerated in the DEO. Crane withdraws from her anti-alien initiative. Meanwhile, Kara and Winn become distant to each other. Adam pays a visit to Cat due to receiving a letter, which was actually written by Kara. Adam and Cat find it hard to develop a relationship, but Kara later helps them reconcile. Adam asks Kara on a date, which she accepts. An identical Supergirl appears in National City.
12	12	"Bizarro"	John Showalter	Roberto Aguirre-Sacasa & Rachel Shukert	February 1, 2016 (2016-02-01)	4X7612	6.68
It is revealed that the new Supergirl is the woman Maxwell has been experimenting on and has brainwashed her with the sole purpose of killing the prime Supergirl. Cat titles her "Bizarro", who later witnesses Supergirl saving civilians and realizing that Supergirl is not a bad person, as Maxwell has dictated to her. However, Maxwell convinces her to continue hunting Supergirl. Bizarro attacks Kara when she is out with Adam, making her realize that Maxwell knows her identity. The DEO uses Kryptonite on Bizarro, whose face gets deformed instead and manages to escape. Kara decides to end her relationship with Adam. Maxwell advises Bizarro to use a person Supergirl cares about, so she kidnaps James. Kara arrives and engages her before Alex uses a modified Kryptonite to weaken Bizarro, who is rendered unconscious and kept in the DEO. Alex brings Maxwell to the DEO and locks him up, so he threatens Eliza indirectly. Back at her apartment, Kara is attacked by an unknown creature.
13	13	"For the Girl Who Has Everything"	Dermott Downs	Story by: Andrew Kreisberg Teleplay by: Ted Sullivan & Derek Simon	February 8, 2016 (2016-02-08)	4X7613	7.92
The creature, which is known as the Black Mercy, places Kara in a dreamlike state that has her imagining she is back on Krypton. The Black Mercy is part of a plot by Non, who is using Earth's technology to launch "Myriad", which he and Astra are planning to use to wipe out humanity. Astra secretly informs Alex of the Black Mercy, and the latter enlists the help of Hank, Winn, Maxwell, and James to save Kara, with Alex entering Kara's mind to pull her out and bring her back to reality. When Kara comes back, she seeks revenge on Non and stops him, who escapes with after revealing the word "Myriad". Elsewhere, Astra engages Alex and Hank, who fights as the Martian Manhunter. The former overpowers him before Alex impales her with a Kryptonite sword, killing her. Kara arrives and Hank tells her that he killed Astra instead of Alex, who starts to feel guilty over whether she should tell Kara the truth. Non vows revenge on Kara in the wake of Astra's death.
14	14	"Truth, Justice and the American Way"	Lexi Alexander	Story by: Michael Grassi Teleplay by: Yahlin Chang & Caitlin Parrish	February 22, 2016 (2016-02-22)	4X7614	7.25
Kara and Non pay their final respects to Astra, and he vows to kill her after he finishes mourning. Kara, Alex, and J'onn track down an armored alien known as the Master Jailer, whom they discover was a guard at Fort Rozz. He has become a vigilante who kills the alien fugitives, including those convicted of non-violent crimes such as a professor sentenced for drug smuggling. Kara confronts the Jailer, but he takes her prisoner and plans to execute her for not joining him. The DEO pinpoints their location and Kara is able to save the professor and defeat the Jailer. Alura refuses to reveal anything about Myriad and Kara realizes she cannot forgive J'onn for killing Astra. Meanwhile, Cat assigns James and Lucy to investigate Maxwell's disappearance. Tensions between James and Lucy develop after he reveals his knowledge of the DEO and friendship with Supergirl. The DEO releases Maxwell, threatening to disclose his criminal activity if he reveals Supergirl's identity or the DEO's location. Kara finds competition in Cat's new "first assistant" Siobhan Smythe.
15	15	"Solitude"	Dermott Downs	Story by: Rachel Shukert Teleplay by: Anna Musky-Goldwyn & James DeWille	February 29, 2016 (2016-02-29)	4X7615	6.69
A hacker steals the personal information of several people and gives it to Cat for disclosure, which she refuses. The hacker, turned out to be an alien named Indigo with the ability to use the internet for traveling, announces her decision to destroy National City. Kara leaves the DEO and enlists the help of James and Lucy to stop Indigo while the DEO enlists Winn for it. Lucy realizes that Indigo's intention in the hacking was only one person, a military general with access to the nuclear arsenal. Indigo infiltrates the nuclear base using the general's cell phone and launches a missile towards National City. Kara stops it using the DEO's help. Winn uploads a virus to Indigo, destroying her after she reveals to Kara that it was she who helped Kara's ship exit the Phantom Zone, which in turn facilitated Fort Rozz's expulsion. Kara decides to rejoin the DEO, and Alex reveals the truth about Astra, being forgiven by Kara. Lucy ends her relationship with James, accusing him of loving Kara. Winn and Siobhan develop a relationship. Non recovers Indigo's pieces and revives her.
16	16	"Falling"	Larry Teng	Robert Rovner & Jessica Queller	March 14, 2016 (2016-03-14)	4X7616	6.53
After helping fight a warehouse fire, Supergirl inadvertently comes into contact with Red Kryptonite which overrides her inhibitions. Kara/Supergirl soon becomes more cold, shallow, and cynical which causes Winn, James, Alex, and even Cat to wonder what is going on with her. Kara even goes so far as to rat out the back-stabbing Siobhan by leaking information that Siobhan has been contacting the Daily Planet for information on Supergirl's actions, which results in Cat firing Siobhan and denying her a job at the Daily Planet. It soon turns out that Maxwell Lord created the so-called Red Kryptonite, in the hopes of stopping Non's next attack. After the compromised Supergirl makes an attempt on Cat's life, Cat goes on TV and denounces Supergirl. Alex and Maxwell are forced to form an uneasy alliance while he tries to help the DEO stop Supergirl. After a climactic battle downtown, the DEO is able to subdue and cure Supergirl, but at the price of Hank revealing himself as the Martian Manhunter.
17	17	"Manhunter"	Chris Fisher	Story by: Derek Simon Teleplay by: Cindy Lichtman & Rachel Shukert	March 21, 2016 (2016-03-21)	4X7617	6.00
While Kara is trying to win back National City's trust, the hot-headed Marine Colonel James Harper (guest star Eddie McClintock) begins an investigation into the J'onn affair with Lucy, having re-enlisted into the Army at her previous rank of Major, as his legal assistant. Hank/J'onn J'onzz then tells the backstory about how he first met Jeremiah Danvers (guest star Dean Cain) 10 years earlier while he and Hank were on a mission in South America to find him and how J'onn took his identity to oversee the DEO. After her interrogation, the vindictive Lucy implicates Alex with her knowledge about J'onn's real identity. After learning that Hank and Alex are on their way to Project Cadmus, Kara finally tells Lucy that she is Supergirl and convinces her to help rescue Hank and Alex. Hank learns that Jeremiah is still alive, so he and Alex go on the run to find him, but not before manipulating Harper into resigning from the Marines and appointing Lucy as the acting director of the DEO. Meanwhile, Siobhan tries to get revenge on Kara for getting her fired, but gets caught by Winn and discovers that she has the power to sonic scream.
18	18	"Worlds Finest"	Nick Gomez	Story by: Greg Berlanti Teleplay by: Andrew Kreisberg & Michael Grassi	March 28, 2016 (2016-03-28)	4X7618	7.17
Siobhan discovers that the women in her family are cursed with the spirit of a banshee, which can only be quieted by killing whoever wronged them. Deciding to kill Kara, Siobhan frees Livewire from captivity at the DEO and suggests they team up to kill both Kara and Cat. Siobhan—now calling herself Silver Banshee—and Livewire kidnap Cat and wreak havoc on National City Park. Meanwhile, Supergirl has a run-in with Barry Allen / Flash, a superhero from a parallel universe, whom she asks for his help to find Livewire and Silver Banshee. After a climactic fight in a downtown park, Kara is able to subdue them and win back National City's trust. Later when Kara decides to reveal her romantic feelings for James, she discovers that he and everyone in National City has fallen under some kind of spell, revealed by Non to be the result of Myriad. This episode is a crossover with The Flash season 2 episode 18.
19	19	"Myriad"	Adam Kane	Yahlin Chang & Caitlin Parrish	April 11, 2016 (2016-04-11)	4X7619	6.12
The Myriad effect has taken over National City and even Superman is under control due to his human upbringing leaving him susceptible to the signal, leaving Kara, Cat, and Maxwell as the only ones immune, as Max had devised a means of blocking the signal that he gave to Cat. Now, Kara must find a way to stop Non, but Maxwell is looking at destroying the Kryptonians with a Kryptonite bomb even at the risk of killing other humans. Cat objects and prompts Kara to find an alternative. The effect brings fugitives Alex and J'onn back after Alex tells Eliza the truth about Jeremiah and Hank Henshaw. When Indigo senses the two returning, she defeats J'onn, but takes Alex and places her under mind control as Non's payback for Astra's death.
20	20	"Better Angels"	Larry Teng	Story by: Andrew Kreisberg & Ali Adler Teleplay by: Robert Rovner & Jessica Queller	April 18, 2016 (2016-04-18)	4X7620	6.11
Kara fights with Alex, who is controlled by Non. Eliza pleads with Alex to stop, as Alex is about to kill Kara with the Kryptonite sword, which breaks Non's control over her. The team learns that hope is the key to stopping Myriad. Supergirl inspires the citizens of National City, waking them from the Myriad trance. However, Indigo convinces Non to kill all the humans on Earth by increasing Myriad's frequency. Max warns Kara that she might not survive a solo fight with Non and Indigo; J'onn later insists on helping her. Kara and J'onn confront Non and Indigo at Fort Rozz, which is powering Myriad. Kara defeats Non in a heat vision battle and J'onn rips Indigo's body apart. As Indigo dies, she reveals that she locked the system so Myriad cannot be shut down. Kara flies Fort Rozz into space, rendering Myriad harmless; Alex rescues her using Kara's pod. Afterward, J'onn is reinstated as the Director of the DEO and Cat gives Kara a promotion. While Kara celebrates at her house, a pod (similar to Kara's) crashes near National City. Kara opens the pod and is shocked by what is inside it.

Season 2 (2016–17)

Main article: Supergirl season 2

Supergirl, season 2 episodes

No. overall	No. in season	Title	Directed by	Written by	Original air date	Prod. code	U.S. viewers (millions)
21	1	"The Adventures of Supergirl"	Glen Winter	Story by: Greg Berlanti & Andrew Kreisberg Teleplay by: Andrew Kreisberg & Jessica Queller	October 10, 2016 (2016-10-10)	T13.20151	3.06
Kara finds an unknown young man lying unconscious in the pod and takes him to DEO. She prepares for a date with James just as the commercial spacecraft, the Venture, is launched into space. It suffers engine failure and descends to Earth, but Kara saves the craft with help from Superman. They discover the main target was Lena Luthor, the new CEO of Luthor Corp after her brother, Lex, was convicted of numerous crimes. In a ceremony where she renames the company L-Corp, she is attacked again by John Corben, an assassin. Alex engages him while Kara and Clark stop a building from collapsing. Corben reveals he was working for Lex before he is shot by Lena. Kara chooses to be a reporter for CatCo, a decision supported by Cat. Kara and James decide to keep their relationship friendly. Winn is formally hired to work at the DEO. Meanwhile, J'onn reveals to Alex that he was the one who found the first cluster of Kryptonite and decided to keep it against the wishes of Clark, who wanted to destroy it. At Project Cadmus, the organization's leader revives Corben and begins turning him into a being called Metallo.
22	2	"The Last Children of Krypton"	Glen Winter	Robert Rovner & Caitlin Parrish	October 17, 2016 (2016-10-17)	T13.20152	2.66
Kara and Clark continue operating together in National City before he decides to return to Metropolis. When they encounter Corben, who has turned into Project Cadmus' prototypical cyborg, his Kryptonite-based powers pose a serious threat. The DEO deduces that there is a mole who smuggled the Kryptonite out. During a subsequent encounter with Corben, another Metallo prototype goes on a rampage in Metropolis without opposition. Alex finds the mole, but he is killed by Cadmus's leader, a scientist who intends to destroy aliens. Winn builds anti-Kryptonite gear for Kara and Clark, who manage to defeat the Metallos with the help of Alex and Hank. Kara promises the Cadmus leader she will find her. Hank entrusts the remaining Kryptonite to Clark, who returns to Metropolis. Meanwhile, Cat introduces Kara to the latter's new boss, Snapper Carr, who does not like her and refuses to give her an assignment. Cat advises her to solve the problem herself and announces that she has decided to leave CatCo, leaving James in charge. Kara manages to prove her value to Snapper, who agrees to teach her. At the DEO, the alien man regains consciousness and attacks Kara.
23	3	"Welcome to Earth"	Rachel Talalay	Jessica Queller & Derek Simon	October 24, 2016 (2016-10-24)	T13.20153	2.65
The alien man escapes the DEO. As President Olivia Marsdin arrives in National City to sign an act giving all aliens amnesty, she is attacked by an unknown alien with the power to shoot fiery energy, believed to be the escapee. Alex encounters police detective Maggie Sawyer at the crime scene, who takes her to a secret bar hosting aliens. Winn discovers the DEO escapee is from Daxam, Krypton's sister planet. Kara defeats the Daxamite and returns him to the DEO. She is uncharacteristically hostile towards him, prejudging his intentions because of a long feud between the Kryptonians and Daxamites. The President is attacked again while signing the Alien Amnesty Act; the assailant is revealed to be an Infernian named Scorcher, who is defeated by Kara, Alex, and Maggie. Kara releases the Daxamite, who introduces himself as Mon-El. She tells him that Daxam's population was annihilated and that Daxam is a wasteland due to Krypton's destruction. Olivia briefly flashes an alien face as she leaves, unbeknownst to the members of the DEO. Meanwhile, Kara interviews Lena, who reveals that L-Corp has invented an alien detection device. In the bar, Hank encounters M'gann M'orzz, a female Green Martian.
24	4	"Survivors"	James Marshall and James Bamford	Paula Yoo & Eric Carrasco	October 31, 2016 (2016-10-31)	T13.20154	2.22
J'onn asks that Mon-El stay at the DEO until he is fully examined. An alien body is found and the DEO track down the murderer, who is then kidnapped by unknown armed men. Maggie and Alex track him down to a secret facility where a woman, Veronica Sinclair (also known as Roulette), hosts rich and powerful people. The aliens are forced to duel, sometimes to the death. They spot M'gann as a contestant before Kara intervenes and is attacked by an alien called Draaga, who overpowers her and escapes. J'onn confronts M'gann, who confesses her intense guilt for having survived the extinction of her species. Veronica abducts J'onn with M'gann's help. Using Lena, Kara finds the fight club's new address, where J'onn and M'gann are forced to duel until J'onn convinces her to stop blaming herself and she refuses to continue. When they are attacked by Draaga, Kara arrives and defeats him thanks to Mon-El's advice. She dissuades the other aliens from protecting Veronica, who is arrested but later released by orders from on high. M'gann secretly shapeshifts to reveal that she is a White Martian.
25	5	"Crossfire"	Glen Winter	Gabriel Llanas & Anna Musky-Goldwyn	November 7, 2016 (2016-11-07)	T13.20155	2.47
A group of robbers, led by Chet Miner, starts challenging Supergirl using alien guns. Cadmus demands the repealing of the Amnesty as a solution. Kara deduces that Cadmus is arming Miner's team. Lena holds a fundraiser which is attacked by Miner and his men. She reveals to Winn that the fundraiser was a ruse for the robbers and they activate a device that destroys the alien weapons, leading to the robbers' arrest. Miner and his team are killed by Cadmus before he can expose them. The leader of Cadmus is revealed to be Lillian, Lena's adoptive mother. Meanwhile, Kara takes Mon-El to CatCo for work, but he continuously ignores her commands, leading to him being fired. Alex convinces her to let him choose his own path. James starts operating as a vigilante. Winn finds out and initially reprimands him, but finally decides to help, intending to make a suit for him. Alex learns that Maggie has broken up with her girlfriend and tries to cheer her up, with Maggie realizing Alex is a lesbian and Alex herself accepting that fact.
26	6	"Changing"	Larry Teng	Story by: Greg Berlanti Teleplay by: Andrew Kreisberg & Caitlin Parrish	November 14, 2016 (2016-11-14)	T13.20156	2.35
In Norway, a group of scientists led by Dr. Jones discover an abnormal wolf corpse, resulting in the mysterious murder of all of the scientists except Jones, who is revealed to be infected by a parasite. The DEO finds out that Jones killed the other scientists. Kara gets angry with Mon-El when she finds out that he has been using his powers to make money. The DEO predicts Jones' next target and Kara and J'onn attempt to stop him, but he drains their powers, becomes larger and stronger, and escapes, leaving the pair weakened and unconscious and J'onn near death. Alex convinces M'gann to donate blood in order to save J'onn. Jones attacks his target again, but Mon-El intervenes. With his suit ready, James arrives to fight Jones too, taking the alias "Guardian." Kara regains consciousness and attacks Jones, using Plutonium 239, which he absorbs, causing him to overload with energy and implode. James convinces Winn not to tell Kara about his alter ego. Mon-El is abducted by Cadmus. Meanwhile, Alex comes out to Kara and tells her about her feelings for Maggie. Kara encourages her to tell Maggie how she feels, but Maggie reveals that she would prefer to remain friends, upsetting Alex.
27	7	"The Darkest Place"	Glen Winter	Robert Rovner & Paula Yoo	November 21, 2016 (2016-11-21)	T13.20157	2.61
A new vigilante appears and starts killing some of the criminals. Mon-El continues his escape plans. Lillian demands Kara come to Cadmus. Kara is overpowered by the real Hank, who is enhanced and called the "Cyborg Superman." Winn helps identify the criminal targets with James help to try and stop the serial killer that was framing Guardian. Lillian forces Kara to deplete her powers, giving the former the chance to take blood samples. Jeremiah saves Kara and Mon-El and helps them escape by staying behind. Guardian confronts the culprit in Phillip Karnowski and defeats him as the police arrive. Kara finally approves of the Guardian, unaware of his true identity only known to Alex. Mon-El recognizes feelings for Kara. Cyborg Superman arrives at the Fortress of Solitude demanding to know about the "Medusa" project. Meanwhile, J'onn begins having hallucinations about White Martians in the DEO. She warns him about the transfusion and reveals that White Martians figured out how to weaponize their blood; if it is in a Green Martian, they become a White Martian, which is happening to J'onn. Alex finally accepts Maggie.
28	8	"Medusa"	Stefan Pleszczynski	Jessica Queller & Derek Simon	November 28, 2016 (2016-11-28)	T13.20158	3.53
Cyborg Superman unleashes a virus in the alien bar, killing every alien there except Mon-El, who is quarantined by the DEO. Eliza Danvers, visiting for Thanksgiving, determines that the virus is Kryptonian. At the Fortress of Solitude, Kara learns that Henshaw was after "Medusa", a virus created by her father, Zor-El, to kill non-Kryptonians in case of alien invasion. At L-Corp, she stops Henshaw from getting the isotope required to disperse Medusa. Lena refuses to help when Kara reveals that Lillian is Cadmus' leader. Later, Lena willingly gives Lillian the isotope. Kara and J'onn confront the Luthors and Henshaw before Medusa is disseminated via rocket launcher. J'onn fights Henshaw, becoming a White Martian, while Kara chases the rocket, which explodes and disperses Medusa. However, Lena has double-crossed Lillian and rendered the virus inert. Lillian is arrested, but Henshaw escapes. Eliza cures Mon-El and uses Medusa to restore J'onn's Green Martian form. Alex comes out to Eliza, who supports her. Later, Maggie and Alex kiss after Maggie admits she does have feelings for Alex. An unknown alien race is searching for Mon-El. Barry Allen and Cisco Ramon arrive from their Earth to enlist Kara's help. This episode ends with a scene that sets up a crossover event that begins on The Flash season 3 episode 8, continues on Arrow season 5 episode 8, and concludes on Legends of Tomorrow season 2 episode 7.
29	9	"Supergirl Lives"	Kevin Smith	Story by: Andrew Kreisberg Teleplay by: Eric Carrasco & Jess Kardos	January 23, 2017 (2017-01-23)	T13.20159	2.65
Winn gets beaten aiding James, leading the former to believe he is not fit for field work. Kara starts investigating a strange series of missing persons. The DEO tracks the kidnappings to a fake clinical trial run by aliens. Searching for the missing people, Kara and Mon-El pass through a portal and land on the planet Maaldoria, epicenter of the slave trade. Realizing that they will not have their powers due to Maaldoria's red sun, the pair tracks the kidnappees to a fortress, intentionally getting captured to wind up in the same cell as the others. They learn that Roulette is involved in the trafficking. Meanwhile, J'onn reveals that the Maaldorian atmosphere is lethal to Martians, making Alex the lead on the rescue team. She convinces Winn to join her, despite his misgivings. Kara incites a riot and the prisoners lock Roulette and her Maaldorian accomplice in the cell before escaping. After reuniting with the DEO, they get to the portal and return to Earth. Winn accepts his potential, while Mon-El, whom the Maaldorians intentionally allowed to leave, decides to become a superhero. An alien group is revealed to be searching for Mon-El. Maggie tells Alex about her knowledge of Kara's alter ego.
30	10	"We Can Be Heroes"	Rebecca Johnson	Caitlin Parrish & Katie Rose Rogers	January 30, 2017 (2017-01-30)	T13.20160	2.35
Kara starts training Mon-El. Leslie is found to be out of prison. Kara and Mon-El go off to engage Livewire, but it turns out to be another woman, who attacks the pair with a male of the same abilities. Mon-El ignores Kara's instructions to protect the civilians, choosing to save her instead. The Guardian arrives and aids them. Their adversaries escape and Kara finds out about James' alter ego, scolding him and Winn. She also gets angry with Mon-El for prioritizing her over the others. The DEO learns that Leslie was actually abducted from incarceration. Winn locates her. James and Mon-El rush there to prove themselves. The duo is captured by a scientist who has been draining Leslie's powers and giving them to his subjects. Kara arrives and saves them, freeing Leslie and dissuading her from killing the scientist in exchange for allowing her to escape. Kara rejects James' offer for cooperation in vigilantism. Mon-El confirms his feelings for her. Meanwhile, M'gann loses consciousness. J'onn agrees to bond with her. In a shared memory, he tells her that she is forgiven. She regains consciousness and J'onn frees her. She reveals that the White Martians are searching for her.
31	11	"The Martian Chronicles"	David McWhirter	Gabriel Llanas & Anna Musky-Goldwyn	February 6, 2017 (2017-02-06)	T13.20161	2.43
J'onn starts following M'gann so as to protect her. Armek, her former mate, comes to Earth with orders to take her back to Mars for execution and gives her two hours to surrender before he goes after her friends. Fearful, J'onn decides to bring her to the DEO for protection. The real M'gann shows up, revealing the other one to be Armek in disguise, forcing J'onn to put the DEO into lockdown. Assuming Winn's identity, Armek initiates a meltdown in the building's nuclear reactor while another White Martian posing as Alex ambushes Kara. J'onn and M'gann free the real Winn and Alex and confront Armek, killing him with a metal pole. Winn fixes the reactor in time and Alex helps Kara subdue the other Martian. Afterwards, M'gann informs J'onn that she intends to return to her home planet in order to reform her people. Encouraged by Alex, Kara tries to ask Mon-El out on a date, only to find that he already has a relationship with Eve.
32	12	"Luthors"	Tawnia McKiernan	Robert Rovner & Cindy Lichtman	February 13, 2017 (2017-02-13)	T13.20162	2.52
Lena testifies against Lillian, and Kara encourages her to visit Lillian, who reveals that she is her husband's daughter from another woman. A package of synthetic Kryptonite is sent to Corben. While testifying, he attacks the court and frees Lillian. A faked video is leaked showing Lena stealing the Kryptonite and she is arrested on suspicion of helping Lillian. Corben breaks her out. Kara remains the only person to believe in Lena's innocence. Lillian takes Lena to a remote facility set up by Lex before his imprisonment and forces her to access a stockpile of alien weapons, several of which she takes. Kara arrives and intervenes. Winn determines that the synthetic Kryptonite is becoming increasingly unstable and will soon explode. Kara manages to save Lena before Corben self-destructs while Lillian and Henshaw escape by helicopter. Lena is exonerated, but begins contemplating her relationship with her family, especially Lex. Kara and Mon-El, who had a disastrous date with Teschmacher, confess their feelings for each other at her apartment when a man calling himself Mister Mxyzptlk arrives and declares his love for her. Meanwhile, Alex introduces Maggie to the group as her girlfriend.
33	13	"Mr. & Mrs. Mxyzptlk"	Stefan Pleszczynski	Jessica Queller & Sterling Gates	February 20, 2017 (2017-02-20)	T13.20163	2.24
Mxyzptlk, an imp from the fifth dimension who can manipulate reality, proposes marriage to Kara, whose refusal he sees as a challenge. Mon-El suggests killing Mxyzptlk, which she rejects. Mxyzptlk summons Parasite to attack National City before killing it in order to impress her. Mon-El inadvertently reveals that another way to remove imps is by getting them to say or spell their names backwards. Later, Winn discovers a device in the DEO's collection that is connected to the same fifth dimensional energy from which Mxyzptlk draws power. Mon-El attempts to use it to duel with Mxyzptlk to the death, but Kara ends the duel by agreeing to marry him. He later arrives at the Fortress of Solitude for their wedding, but Kara states that she will not marry him. Angered, he attacks her, but she stops the battle by locking the fortress down and activating the self-destruct sequence. Mxyzptlk begs for the code to stop the countdown but, after inputting the code, realizes that it spells his name backwards, vanquishing him. Mon-El and Kara develop a romance. Meanwhile, Winn starts dating Lyra Strayd, an alien from Starhaven, and Alex and Maggie celebrate their first Valentine's Day together.
34	14	"Homecoming"	Larry Teng	Caitlin Parrish & Derek Simon	February 27, 2017 (2017-02-27)	T13.20164	2.17
The DEO receives an alarm regarding a convoy departing from Cadmus. Kara and J'onn investigate and rescue a chained Jeremiah, who claims Cadmus has created a fusion bomb using energy from her heat vision. He persuades J'onn to reinstate him back at the DEO, which makes Mon-El suspicious, causing friction between him and Kara. He persuades Winn to watch Jeremiah, who attempts to access the DEO's database, alerting Winn. After confronting Jeremiah, Kara is hesitant to accept his excuse, while Alex believes him. Winn locates the purported bomb, but the DEO finds nothing at the location. J'onn realizes he cannot read Jeremiah's mind and that he is working for Cadmus, having been cybernetically enhanced. Jeremiah overpowers J'onn and downloads information from the mainframe before escaping. Kara and Alex confront Jeremiah, Lillian, and Henshaw, and Kara rushes to save a train that Cadmus endangered while Alex goes after the trio. Jeremiah escapes due to Alex's reluctance to shoot him. Winn later determines that Jeremiah downloaded the list of all the registered aliens in the country.
35	15	"Exodus"	Michael Allowitz	Paula Yoo & Eric Carrasco	March 6, 2017 (2017-03-06)	T13.20165	2.16
Cadmus begins abducting aliens, so Kara asks Snapper to publish an article, but he insists on verifying her sources. When Supergirl confirms the story but refuses to reveal her own source, Snapper refuses to publish. Alex's bias towards Jeremiah leads to J'onn suspending her, but Maggie decides to help her find him. They stop a Cadmus team from abducting an alien and find Cadmus' holding site. It is revealed Jeremiah was blackmailed into working for Cadmus; Lillian threatened to kill his daughters should he refuse. Lena also finds out about the site before Lillian's operatives attempt to stop her, but Kara manages to save Lena. At the Cadmus site, Alex is captured and Jeremiah reveals that Cadmus is planning to deport the aliens to another planet in a large spaceship; he had changed the plan from killing to deporting. Meanwhile, Kara publishes the story on a blog, forcing Lillian to deport the aliens she already has. Alex convinces Jeremiah to help her stop the launch and, while he engages Cadmus operatives, she enters the ship and frees the aliens, but they are locked inside by another gate before the ship launches, programmed to accelerate to light speed once exiting the atmosphere. Supergirl arrives and manages to stop the ship. Snapper fires Kara from CatCo, while Alex is reinstated by J'onn. Daxamites arrive near the Moon.
36	16	"Star-Crossed"	John Medlen	Katie Rose Rogers & Jess Kardos	March 20, 2017 (2017-03-20)	T13.20166	2.07
The Daxamites demand the humans relinquish Mon-El, who surrenders. Kara accompanies him and learns that Mon-El is actually the Prince of Daxam. The ship is commanded by his parents, who want him to lead his people and rebuild Daxam. Kara becomes angry with Mon-El for lying to her. She and Mon-El return to Earth. He apologizes several times, but to no avail. She eventually ends the relationship. Mon-El demands his parents leave him and Earth. Meanwhile, Winn and Lyra break into an art museum for a tryst. He is later arrested by Maggie, who reveals that a painting is missing. Alex convinces Maggie to give them 24 hours to prove Winn's innocence. They find and capture Lyra, who reveals that her brother, Bastian, owes a large sum to a smuggler named Mandrax. She steals paintings to pay down Bastian's debt. Winn frees Lyra as part of a sting operation. The DEO and Guardian then confront and arrest Mandrax and free Bastian. Winn later forgives Lyra's dishonesty. The DEO has captured a new alien, who quickly hypnotizes Kara and escapes to Earth-1 to do the same to Barry. Kara wakes up in a dream where she is a lounge singer. This episode ends with a scene that sets up a crossover event that is featured on The Flash season 3 episode 17.
37	17	"Distant Sun"	Kevin Smith	Gabriel Llanas & Anna Musky-Goldwyn	March 27, 2017 (2017-03-27)	T13.20167	2.21
Kara is attacked by a series of alien bounty hunters. Mon-El suspects his parents are responsible and hope that he will abandon Earth if Kara is dead. His suspicion is confirmed after J'onn telepathically interrogates one of the hunters. Kara suggests she and Mon-El meet with Rhea, his mother, to change her mind. However, Rhea refuses to listen and tries to kill Kara using Kryptonite, so Mon-El agrees to leave Earth if she spares Kara's life. Against President Marsdin's orders, J'onn helps Kara rescue Mon-El from his parents' ship and, after a fierce battle, King Lar Gand agrees to let Mon-El stay on Earth. Marsdin is revealed to be an alien. Rhea kills Lar Gand for what she views as his betrayal and vows to return to Earth to reclaim Mon-El. Meanwhile, after an encounter with an ex-girlfriend of Maggie's, Alex learns that Maggie neglected to tell her that she cheated on the woman, prompting a frank discussion in which Alex asks Maggie to trust her with her secrets.
38	18	"Ace Reporter"	Armen V. Kevorkian	Paula Yoo & Caitlin Parrish	April 24, 2017 (2017-04-24)	T13.20168	1.80
Lena invites Kara to a press conference being held by her former boyfriend Jack Spheer, who unveils Biomax, a new nanobot technology that can heal human ailments. After the conference, Kara is approached and told the human trials of Biomax were faked, but her source is killed by the nanobots before she is told more. Kara and Mon-El crash Lena and Jack's dinner date and take Jack's keycard for his office, discovering footage showing Jack injecting Biomax into himself. Kara later shows the footage to Lena, who confronts Jack and discovers he is being controlled by his CFO Beth Breen via the side effect of the nanobots, loss of free will. Supergirl then turns up to save Lena, but when the former is trapped by the nanobots, Lena is forced to deactivate them, killing Jack in the process. Breen is incarcerated and Snapper rehires Kara at CatCo for providing the Biomax story. Lena is visited by Rhea. Meanwhile, Winn brings Lyra onto the team with him and Guardian, causing tensions that lead to Lyra leaving the team. James returns her to the team with the condition that she follow his instructions.
39	19	"Alex"	Rob Greenlea	Eric Carrasco & Greg Baldwin	May 1, 2017 (2017-05-01)	T13.20169	1.75
Alex is abducted by a person who demands the release of Peter Thompson, a man serving a life sentence for several felonies. The kidnapper is identified as Rick Malverne, Thompson's son and also a childhood friend of the Danvers, having deduced Kara's alter ego on his own. Rick is captured and taken to the DEO. Alex sends a location to Winn, but when Kara rushes to the coordinates, the trap triggers an alarm, causing water to start filling Alex's cell. While the DEO and Kara refuse to negotiate with Rick, Maggie tries to break Thompson out of prison before being confronted by Kara, who convinces Thompson to reveal Alex's location. Kara and Maggie manage to rescue Alex in time and Alex and Maggie profess their love for each other. J'onn decides to wipe Rick's memory. Meanwhile, Rhea gives Lena the schematics of a high-tech device for transporting matter. Lena soon deduces that Rhea is an alien and becomes angry, but Rhea manages to convince her to continue working with her.
40	20	"City of Lost Children"	Ben Bray	Story by: Robert Rovner Teleplay by: Gabriel Llanas & Anna Musky-Goldwyn	May 8, 2017 (2017-05-08)	T13.20170	1.88
James becomes discouraged with being Guardian when he realizes that those he helps are afraid of him. The DEO investigates a Phorian woman who uses her telekinetic powers to cause rampage. James tracks down her son, Marcus, who refuses to speak with anyone but James, who spends time bonding with him. With Rhea's encouragement, Lena completes the matter transporter, which Rhea activates, causing Marcus to nearly destroy the office with his powers. Afterwards, the DEO discovers Rhea and Lena's involvement and that Marcus's mother's "attack" was unintentional on her part. Marcus leads James and Winn to his mother, who is with a large group of Phorians. Rhea reactivates the transporter, causing the Phorians to lose control. James manages to calm Marcus, who in turn calms the others. Kara, J'onn, and Mon-El attempt to shut down the transporter, but are unsuccessful. Mon-El confronts Rhea, but hesitates to kill her. The transporter brings a massive fleet of Daxamite ships to conquer Earth and transform it into "New Daxam". Rhea then teleports herself, Mon-El, and Lena to her ship.
41	21	"Resist"	Millicent Shelton	Jessica Queller & Derek Simon	May 15, 2017 (2017-05-15)	T13.20171	1.93
The Daxamites launch a full invasion of National City, killing and arresting civilians. They also attack the DEO, but Alex and Winn manage to escape. Mon-El learns that he has to marry Lena in order to unite the people of Earth with Daxam. On Air Force One, Marsdin and Cat contact Rhea and demand their withdrawal, but the Daxamite fleet fires on them. Kara saves Cat and they discover that Marsdin is an alien, a refugee from the planet Durla. She tasks the DEO with destroying the Daxamite mother ship with a special cannon. Hesitant to do so, Kara turns to Cadmus for a way into the ship. Cat and Winn stage a distraction, inciting a civilian riot against the Daxamites, while Kara, Hank, and Lillian use a Phantom Zone projector to board the ship. Alex and Maggie regain control of the cannon, while the Luthors escape and try to disable the projector. Having predicted that, Supergirl is able to send Mon-El to safety and goes to confront Rhea, who reveals that she has taken control of Superman and has him attack Kara.
42	22	"Nevertheless, She Persisted"	Glen Winter	Story by: Andrew Kreisberg & Jessica Queller Teleplay by: Robert Rovner & Caitlin Parrish	May 22, 2017 (2017-05-22)	T13.20172	2.12
Rhea uses Silver Kryptonite to manipulate Kal's senses, causing Kara to appear to be General Zod. Kara eventually overpowers and takes him to the Fortress, where a recovered Kal finds a way to end the invasion. Kara challenges Rhea to Dakkam Ur, a rite in which two leaders duel and the loser concedes the war, accepted by Rhea. Lillian, Lena and Winn build a device to disperse lead into the atmosphere. As lead is lethal to Daxamites, it would make the planet uninhabitable to them. With Mon-El's approval, Kara tells the DEO to use it if she loses. During the duel, Rhea resumes the invasion. M'gann returns with other benevolent White Martians and J'onn awakens to join the battle. Rhea claims the invasion will not stop even if she loses, so Kara launches the device, killing Rhea and forcing the fleet to leave. Kara puts Mon-El in a pod and sends him away from Earth. Cat reassumes her position at CatCo and Alex asks Maggie to marry her. In deep space, Mon-El's pod is drawn into a wormhole. In flashbacks to Krypton's destruction, an unknown faction sends another infant to Earth in order to "reign."

Season 3 (2017–18)

Main article: Supergirl season 3

Supergirl, season 3 episodes

No. overall	No. in season	Title	Directed by	Written by	Original air date	Prod. code	U.S. viewers (millions)
43	1	"Girl of Steel"	Jesse Warn	Story by: Andrew Kreisberg Teleplay by: Robert Rovner & Caitlin Parrish	October 9, 2017 (2017-10-09)	T13.20651	1.87
Kara has been dreaming of Mon-El and has become obsessive with her vigilantism, ignoring downtime with others in her life. Lena and James oppose industrialist Morgan Edge regarding his plan for waterfront housing estates. James is running CatCo with Cat serving as White House Press Secretary and Snapper on sabbatical. Kara quits CatCo, believing she needs to prioritize being Supergirl and pushing away Alex, who is making plans to marry Maggie. Edge hires criminal Bloodsport to attack the unveiling of a Supergirl statue by the waterfront with a submarine, forcing Kara to go underwater to stop them. When she passes out, her dream of Mon-El rallies her and she stops the attack. In order to nullify Edge's attempts to buy CatCo and silence it, Lena buys it herself. Kara decides to return to CatCo and rejoins her friends. Meanwhile, Samantha "Sam" Arias, a woman whom Alex helped at the waterfront, wakes up after a dream with a disturbing creature.
44	2	"Triggers"	David McWhirter	Gabriel Llanas & Anna Musky-Goldwyn	October 16, 2017 (2017-10-16)	T13.20652	1.76
Kara battles a powerful metahuman bank robber called Psi, who can evoke her victims' deepest fears, forcing Kara to struggle with her memories of Krypton's destruction and her guilt over Mon-El. After Winn's psychic dampener fails, Kara finally overcomes her fear and arrests Psi. Lena decides to run CatCo personally, taking James by surprise and creating friction with Kara, who initially has difficulty separating work and their friendship. Sam Arias' daughter, Ruby, deliberately puts herself in danger to test whether her mother has superpowers, but she is rescued by Kara. Sam begins to question who she is and her origins and becomes Lena's replacement at L-Corp, acting as its CFO. Alex learns that Maggie seems to not want children. J'onn receives a telepathic summons from M'gann, urging him to come to Mars immediately.
45	3	"Far from the Tree"	Dermott Downs	Jessica Queller & Derek Simon	October 23, 2017 (2017-10-23)	T13.20653	1.76
J'onn tells Kara and Alex about M'gann's message and Kara goes with him as back-up. The two journey to Mars in his spaceship, encountering M'gann and a resistance of White Martians. They discover J'onn's father, M'yrnn, has been coerced into giving the villainous White Martians the location of the Staff of Kolar, a psychic weapon that can defeat the resistance. J'onn rescues M'yrnn, who initially believes J'onn is a White Martian in disguise. Eventually, Kara convinces M'yrnn to let J'onn prove his identity. Having acquired the location, the resistance arrives and defeats a contingent of White Martian operatives. The recovered staff is entrusted to J'onn, who returns to Earth with M'yrnn and Kara. Meanwhile, Eliza throws Alex and Maggie a bridal shower. Alex convinces Maggie to invite her father, who comes but still cannot tolerate her homosexuality. She tells him that she no longer needs him because she now has a family who accepts her. However, she confirms to Alex that she does not want children.
46	4	"The Faithful"	Jesse Warn	Paula Yoo & Katie Rose Rogers	October 30, 2017 (2017-10-30)	T13.20654	1.82
The night Kara first revealed her powers and became Supergirl, a grieving passenger, Thomas Coville, was inspired by her. In the present, Kara attends an ostensible self-help group with Winn and James and discovers a "cult" made up of people she previously saved. Led by Coville, they worship Supergirl and follow Kryptonian God Rao's teachings. Those who wish to join initiate disasters so that Supergirl will save them. Coville recognizes Kara in her alter-ego when she confronts him. The group plans to blow up a stadium filled with people. When Kara tries to stop them, she finds Kryptonite inside the bomb which she uses to wound herself, thereby disillusioning the cult. Alex gets rid of the Kryptonite and, with Coville's help, pushes the bomb into a deep hole created by Kara's heat vision, where it detonates. The explosion causes a being in a vessel to awaken. Coville advises Kara to follow Rao to find her path. Meanwhile, Sam has a vision of a monstrous creature in her home, telling her she soon will "reign". Alex reveals to Kara that, while Maggie does not want children, she does.
47	5	"Damage"	Kevin Smith	Eric Carrasco & Cindy Lichtman	November 6, 2017 (2017-11-06)	T13.20655	1.87
Several children are diagnosed with lead poisoning. Morgan publicly blames Lena's lead device which repelled the Daxamites, causing the public to turn on her. She attempts to give a speech to defend herself, but ends up taking fire. Kara and Sam investigate, discovering that all the affected children attended a public pool laced with a chemical which causes the same symptoms and is manufactured by one of Morgan's subsidiaries. Lena confronts Morgan alone. She is knocked unconscious and imprisoned inside a plane with barrels of the chemical, set on a collision course for the city's water supply. Lena manages to get a message to Supergirl, who rescues Lena, secures the barrels, and destroys the plane. Morgan, however, covers his tracks. Maggie and Alex realize that, even though they love each other, they must let each other go because they disagree on having children. Alex lets Maggie know how much she has helped her happily accept herself. Maggie, in turn, lets Alex know how much stronger she grew as a person. They part tearfully, with Maggie bringing everything full circle: "See you around, Danvers". Sam discovers that she was shot during the attempt on Lena's life, but was not injured.
48	6	"Midvale"	Rob Greenlea	Caitlin Parrish & Jess Kardos	November 13, 2017 (2017-11-13)	T13.20656	1.89
Kara and Alex arrive at Eliza's home to help overcome their grief, but they quarrel instead. Ten years prior, while attending Midvale High School, Alex and Kara did not get along until a mutual friend, Kenny Li, was murdered. A photograph on his laptop revealed their teacher was in a relationship with Alex's best friend. Kara sent the remaining encrypted files to her cousin Clark's friend Chloe for decryption. After an attempt on Alex and Kara's lives, the teacher was arrested, but Alex discovered an alibi for him. Kara decided to cease looking into Kenny's death after a conversation with Noel Neill, an FBI agent who strongly resembles Alura (in reality, a disguised J'onn). Alex went to the sheriff Ronald Collins for help just as Kara learned that the sheriff was involved in drug dealing and was Kenny's killer. Kara saved Alex from being killed by the sheriff. The sisters bonded and Kara decided to not use her powers again, taking Agent Neill's advice to embrace her new home. In the present, after recalling their first adventure together, the sisters reconcile and return to National City.
49	7	"Wake Up"	Chad Lowe	Gabriel Llanas & Anna Musky-Goldwyn	November 20, 2017 (2017-11-20)	T13.20657	1.92
Kara, J'onn, and Winn investigate a crashed spaceship detected beneath National City. They find Mon-El and occupied stasis tanks aboard. They take him back to the DEO; when he attempts an escape, a suspicious Kara locks him in a cell. Mon-El convinces Winn to take him back to the ship because the life-support systems are unstable. Kara follows them. Mon-El explains that his pod went through a wormhole, bringing him to the 31st century where L-Corp had long since developed a cure for the Daxamite lead allergy. While only seven months had passed for Kara, Mon-El experienced seven years in the future. One of the tanks begins to malfunction; Mon-El cannot break it open, so Kara frees its occupant: Mon-El's wife, Imra. J'onn decides to rent an apartment for him and M'yrnn to live together, taking the first step towards restoring their bond. After discovering another superhuman ability, Sam visits her foster mother and learns of her Kryptonian origins. She later travels to the "Fortress of Sanctuary", where a holographic artificial intelligence reveals that, while Sam's motherhood was unexpected, her Kryptonian physiology is enhanced and she is destined to become the Worldkiller. Despite Sam's resistance, her eyes turn red and her alternate persona – Reign – is triggered from her subconscious.
50	8	"Crisis on Earth-X, Part 1"	Larry Teng	Story by: Andrew Kreisberg & Marc Guggenheim Teleplay by: Robert Rovner & Jessica Queller	November 27, 2017 (2017-11-27)	T13.20658	2.71
On the parallel world of "Earth-X", a Nazi regime rules the planet where an archer, Dark Arrow, is the Führer, and personally hunts the resistance forces. Dark Arrow seizes a temporal gateway from the Freedom Fighters members including James' parallel universe doppelgänger, a device that allows interdimensional travel to other universes; he schemes to invade parallel Earths with the device to spread his reign so that it may last. Kara and Alex travel to Earth-1 to attend Barry Allen's wedding with Iris West. Alex meets the Legends' leader Sara Lance / White Canary, taking the first step to recover from her break up with Maggie. The wedding ceremony is interrupted by Earth-X Nazi invaders, led by Dark Arrow, his Kryptonian-powered wife Overgirl, and his partner Prometheus. After Kara defeats and injures Overgirl during the fight the Nazis retreat, and Alex and Sara capture Prometheus to interrogate. As Overgirl recuperates, she, Dark Arrow, and a yellow-clad speedster regroup and discuss their next move, Dark Arrow and Overgirl are revealed as parallel universe doppelgängers of Oliver Queen / Green Arrow and Kara, and the yellow speedster is Barry's nemesis from the 22nd century Eobard Thawne / Reverse-Flash. This episode begins a crossover event that continues on Arrow season 6 episode 8 and The Flash season 4 episode 8, and concludes on Legends of Tomorrow season 3 episode 8.
51	9	"Reign"	Glen Winter	Paula Yoo & Caitlin Parrish	December 4, 2017 (2017-12-04)	T13.20659	1.81
Sam wakes up at home with no memory of being in a Kryptonian fortress, but finds she is oddly tired. A mysterious Kryptonian symbol, unknown to Kara, appears throughout National City and Thomas Coville later explains to her that it is a mark of a great evil from Krypton deliberately erased from its society. Mon-El and Imra explain how their ship came from the future and how the former founded the superhero team, the Legion. As Kara hosts a Christmas get-together at her apartment, Sam becomes Reign who, as a masked vigilante, attacks and kills random criminals around National City, including Edge, who is able to escape when she attacks him. Reign's rampage damages Supergirl's reputation due to her having the same powers and similar physical attributes. Lena and James begin a relationship after an assassination attempt on Lena by Edge. When Kara decides to face Reign, they fight throughout the city; in the process, Kara discovers that Reign is stronger than her. Though the fight clears Supergirl's name and reveals another Kryptonian in National City, Reign eventually overpowers Kara and drops her off a building, requiring emergency medical care from the DEO. On Christmas Day, Ruby runs downstairs to find her mother, but Sam does not seem quite right.
52	10	"Legion of Superheroes"	Jesse Warn	Derek Simon & Eric Carrasco	January 15, 2018 (2018-01-15)	T13.20660	2.17
Kara's injuries are healed by the Legion's technology, but she remains in a coma following her defeat by Reign. The Legion's Coluan member, Brainiac 5, enters her mind to try to wake her. Though Sam continues her life with Ruby, Reign takes control sporadically without Sam's knowledge and Ruby remains unaware of her mother's divided personality. Reign continues her rampage throughout National City and has a series of confrontations with the DEO and the Legion. Kara emerges from her coma to join them when Reign seeks to destroy a prison. Kara injects Reign with a concentrated dose of liquefied Kryptonite, forcing her to retreat. Prior to Kara's awakening, J'onn, who disguised himself as Kara to cover for her, advises Lena on her new relationship with James. Lena sees that James is not trying to distance himself from her because of her family, but she is afraid to be with him; they become closer afterward. Kara takes steps to move on from Mon-El after her near-death experience and develops a friendship with Brainiac 5. As Reign recuperates in her fortress, she learns that there are other Worldkillers like her and Coville joins her cause.
53	11	"Fort Rozz"	Gregory Smith	Gabriel Llanas & Anna Musky-Goldwyn	January 22, 2018 (2018-01-22)	T13.20661	2.07
Sam prepares to go on a business trip, leaving Alex to babysit Ruby. The DEO learns that a priestess with knowledge of Reign's mission is imprisoned in Fort Rozz, which is currently drifting near a blue star that emits a radiation fatal to males and strips Kara of her powers. Kara forms a team with Imra, Livewire, and Psi to locate the priestess. Reign learns of their mission and intercepts them inside Fort Rozz. The team locates the priestess, Jindah Kal Rozz, and she reveals the existence of two other Worldkillers (Purity and Pestilence) before Reign kills her. Livewire sacrifices herself to save Kara's life while Psi uses her powers to drive off Reign. Imra's ship starts drifting into the star, but Winn, communicating through the Voyager 2 probe, saves the vessel. The team returns to Earth and Kara repays Psi's assistance by asking the DEO to give her better accommodations. Prompted by a nightmare, Sam asks Alex for help with her "missing time". A woman named Julia Freeman is struck by a car; however, she effortlessly moves it off her chest, and her eyes turn silver, revealing herself to be a Worldkiller.
54	12	"For Good"	Tawnia McKiernan	Story by: Robert Rovner Teleplay by: Cindy Lichtman & Alix Sternberg	January 29, 2018 (2018-01-29)	T13.20662	2.11
Lena is poisoned by an unknown hitman; James pursues him, but the hitman is shot down by a sniper. Kara and Alex are able to stabilize Lena at the DEO. Meanwhile, Edge's car is remotely hijacked. Lena and Kara gatecrash a party hosted by Morgan Edge, where Lena confronts him about trying to kill her and warns that her mother wants revenge. Lena confesses to Edge that she hijacked his car. A drone controlled by Lillian Luthor attacks Morgan, prompting him to admit he tried to kill Lena. After Supergirl arrives, Lillian attacks her with a Kryptonite blade while wearing Lex's exoskeleton. Kara and Mon-El fight Lillian until Winn hacks the drone and disables the armor. Edge is stopped from escaping with the recorder containing his confession by Guardian; Lena retrieves the recorder. Lillian and Edge are arrested. Sam fears she has a brain tumor due to her memory loss, but all the medical tests come back normal. Winn, J'onn, and Mon-El deduce that the Worldkillers are genetically modified to be stronger and more able to blend into the human race than conventional Kryptonians. Suspecting the Worldkillers arrived on Earth around the same time as Superman and have secret identities, Winn discovers four possible women, including Julia Freeman, whom Kara identifies.
55	13	"Both Sides Now"	Jesse Warn	Jessica Queller & Paula Yoo	February 5, 2018 (2018-02-05)	T13.20663	2.12
Supergirl and the DEO converge on Julia Freeman's home; initially, she seems normal, but her alter-ego, Purity, takes over and fights them before being subdued. Sam, on sick leave from L-Corp due to her amnesiac episodes, decides to spend time with Ruby by taking her ice skating. However, Reign takes control over Sam after Purity's capture and abandons Ruby to deal with the DEO. Ruby calls Lena after finding herself alone. Through Purity, Supergirl suspects that each of the Worldkillers' personalities are split, including Reign's; therefore, in order to stop them, they need to reach their benevolent sides. When Purity escapes despite the heroes' attempts to recapture her, Julia regains control, but Reign abducts her to the Fortress of Sanctuary to complete her transformation. While repairing the Legion's ship, Mon-El confides to J'onn that he still loves Kara despite also loving Imra, although he did not marry her on his own terms. Imra confesses to Mon-El that she and Brainiac 5 have a secret agenda. At L-Corp, Reign briefly takes control over Sam in front of Lena.
56	14	"Schott Through the Heart"	Glen Winter	Caitlin Parrish & Derek Simon	April 16, 2018 (2018-04-16)	T13.20664	1.91
Kara, Alex, and Winn attend his father's funeral. Winn is approached by his estranged mother, Mary, but remains distant. Kara saves Winn and Mary when the coffin detonates. Mary reveals to Winn that, after trying to escape to an abuse shelter, Winn's father ran them off the road and threatened Winn's life if she ever went near him again. Flying monkey toys attack the DEO, which Kara and James fend off. Mary helps her son analyze the toys to discover their origin. Mon-El attempts to reconnect with Kara and reveals the Legion came to National City to stop the Worldkiller Pestilence, who will transform into Blight in 1,000 years. Toyman's penitentiary officer, who sent the toys, kidnaps Mary and holds her at an abandoned toy factory. Kara, Mon-El, and Winn save Mary after battling a toy dinosaur and incapacitating the officer. James calls up Lena, who claims to be busy with L-Corp work; she is keeping Sam in a locked medical bay in L-Corp under sedation.
57	15	"In Search of Lost Time"	Andi Armaganian	Story by: Eric Carrasco Teleplay by: Katie Rose Rogers & Nicki Holcomb	April 23, 2018 (2018-04-23)	T13.20665	1.38
Lena brings Sam out of sedation and tells her that her blood tests are normal, but further analysis shows Sam undergoes a metamorphosis at the cellular level when she becomes Reign. Sam refuses to believe her even when shown images of Reign that correspond with the times of her blackouts. At the DEO, M'yrnn performs a ritual to help preserve his mind, but the psychic bleed affects everyone by bringing out their aggression, except for Mon-El (whose Legion ring protects him). Mon-El trains Supergirl on how to use her cape during combat. M'yrnn's ritual causes chaos around the DEO. J'onn convinces M'yrnn to wear a power-dampening bracelet to stop the psychic bleed after a White Martian and other prisoners escape their cells. Sam refuses to believe she is Reign, so Lena is forced to push Sam to the limit emotionally by threatening to keep Ruby away from her, causing Sam to turn into Reign. After she regains control and Lena shows her the video proof, Sam asks Lena to keep Ruby away from her until she is cured. While flying, Kara and Mon-El see dead birds fall from the sky and realize Pestilence is behind it.
58	16	"Of Two Minds"	Alexandra La Roche	Gabriel Llanas & Anna Musky-Goldwyn	April 30, 2018 (2018-04-30)	T13.20666	1.50
The DEO investigates the rash of dead animals; it spreads to humans, as people develop flu-like symptoms with a large scratch on their wrists. Imra believes this is the work of Pestilence, the third Worldkiller. Winn and Alex become infected; Brainiac 5 creates a cure using a blood transfusion from Mon-El and Imra, though it fails. The DEO discovers the person behind the attacks is Grace Parker, who has fully accepted her powers and role as a Worldkiller. Supergirl, Mon-El, and Imra battle Pestilence until Purity arrives to help her escape. Imra is able, however, to gain a blood sample from Pestilence for Brainiac to manufacture a working cure. Lena still holds Sam at the L-Corp lab to run tests, where she causes Reign to appear for brief moments so she can learn more about her. While in Sam's mind, Reign tells her they are coming for them. After detecting Purity and Pestilence approaching L-Corp, Kara, Mon-El, Imra, and J'onn go to warn Lena, where they discover Sam. Purity and Pestilence arrive, freeing Reign, and the three fly off together.
59	17	"Trinity"	Jesse Warn	Story by: Jessica Queller Teleplay by: Caitlin Parrish & Derek Simon	May 7, 2018 (2018-05-07)	T13.20667	1.60
Lena is questioned at the DEO and reveals that she contained Reign using the last of Lex's Kryptonite. At the Fortress of Sanctuary, the Worldkillers work to bring about a total eclipse, which will render Kara powerless permanently. Grace is dead, but Sam and Julia are still fighting to remember their human lives and stop the Worldkillers from taking control. Kara asks James to make sure Lena does not possess more Kryptonite, but James decides to take Lena's word. Brainiac 5 broadcasts Supergirl's, Alex's, and Lena's minds into Juru, a Kryptonian valley, where they track down Sam and Julia. Sam is reminded of Ruby, which prompts her to retake control of her body on Earth. Sam activates a location beacon for the DEO just as Brainiac pulls Supergirl, Alex, and Lena out of Juru. Reign takes back control as the DEO arrives in the Legion ship. A fight culminates in Julia (awakened by Alex) and Pestilence killing each other and Reign absorbing their powers, causing the fortress to collapse. James tells Lena he is Guardian and that Supergirl asked him to confirm there was no more Kryptonite. Lena admits that she made the Kryptonite herself. Reign decides to go after Ruby.
60	18	"Shelter from the Storm"	Antonio Negret	Story by: Robert Rovner Teleplay by: Lindsay Gelfand & Allison Weintraub	May 14, 2018 (2018-05-14)	T13.20668	1.53
Lena and James are attacked by Reign at Lena's place. Lena uses Kryptonite against Reign, which forces Reign to retreat. However, Lena learns about Reign's hunt to kill Ruby. The Legion's members prepare for return to their time. Lena tells Supergirl and Alex about Lex's mansion, where she had arranged for Ruby's stay. Alex visits Ruby to keep her company. Supergirl and J'onn visits Sam's mother to keep her safe from Reign and to set a trap for her when she comes looking for Ruby there. However, Reign kills Sam's mother. Supergirl and J'onn discover that Reign now has the powers of all three Worldkillers. Reign attacks Alex and Ruby at the mansion, leading the latter to discover her mother's split personality. Mon-El stays behind to help Supergirl. They are able to capture Reign with the help of Kryptonite created by Lena. Later, Alex comforts Ruby following the revelation; Ruby now fears for her mother and herself, knowing that she is Reign's child. Lena tells Kara that Supergirl crossed a line by using her personal relationship with James and she will never trust her again, leading Kara to be abashed of her actions and doubting her ethics.
61	19	"The Fanatical"	Mairzee Almas	Paula Yoo & Eric Carrasco	May 21, 2018 (2018-05-21)	T13.20669	1.47
Kara and James discuss Lena's mistrust of Supergirl and keeping secret identities. Tanya, a Coville follower, brings Coville's personal journal for James to give to Supergirl. Mon-El and Kara find remnants of a nuclear explosion at the cult's last location. The cult kidnaps Tanya from CatCo, pursued by Guardian. In the ensuing fight, Olivia, the cult's new leader, shoots off James' mask and the cult escapes after the police arrive; the cult later demands Tanya and the journal from James, threatening to reveal Guardian's secret identity. From Coville's journal, Kara realizes the cult is trying to make a new Worldkiller using Harun-El, a black Kryptonite. Mon-El purposefully gets kidnapped by the cult as Tanya turns herself over to them. As Olivia starts the ritual to transform herself into a Worldkiller, Mon-El sends a signal for Supergirl to locate them. After a brief fight, Supergirl reasons with Olivia enough for her to give up the desire to be a Worldkiller. Winn and Lena find more of the Harun-El, which can be used to help Sam, on a meteor; Mon-El and Kara fly J'onn's spaceship to travel there.
62	20	"Dark Side of the Moon"	Hanelle Culpepper	Derek Simon & Katie Rose Rogers	May 28, 2018 (2018-05-28)	T13.20670	1.57
Kara and Mon-El reach the meteor and discover there is a city on it. They are attacked by caretaker droids, but use disguises to blend in while traveling through the city towards the rock. Alex is attacked while spending time with Ruby. She initially suspects it is the killer sheriff she and Kara helped capture ten years ago until a second attempt is made on her life. Kara realizes the meteor is a surviving part of Krypton, Argo City, and discovers her mother is alive. Alura arranges for a meeting of their High Council to discuss the issue of the Harun-El, as it is used to sustain the life and security of the city. Kara manages to convince the members of the High Council to give her a small quantity of it to defeat Reign. Alex and J'onn set a trap for Alex's assassin by having J'onn pose as Alex, but the man targets the real Alex before she captures him. Later Selena, a High Council member, is revealed to be a Dark Priestess. Kara and Mon-El arrive back at L-Corp just as Reign's increasing immunity to Lena's Kryptonite allows her to escape containment.
63	21	"Not Kansas"	Dermott Downs	Gabriel Llanas & Anna Musky-Goldwyn	June 4, 2018 (2018-06-04)	T13.20671	1.83
Kara and Mon-El fight Reign as Lena creates an antidote from the Harun-El. Once injected, Reign separates from Sam and disintegrates. Sam reunites with Ruby at the DEO and Kara asks Lena to artificially reproduce the black rock for Argo City. Kara decides to return to Argo City to be with Alura and she invites Mon-El to join her. Winn and James discover a gun from the DEO is being used on the street as they monitor National City's security for Kara. James and J'onn learn the gun manufacturer sold a version of the DEO weapon to the general public and J'onn later mandates that the DEO switch to non-lethal weaponry. Back in Argo, Kara and Mon-El talk about their feelings for each other, but are interrupted by a woman who has been following Kara. She identifies herself as a Dark Priestess and Selena as her High Priestess. M'yrnn and J'onn discuss performing the Reach, a Martian ritual for an elder to pass on all memories to a younger family member. Kara and Mon-El discover that Selena and the other priestesses stole their ship and Coville joins them when they arrive on Earth, leaving Kara and Mon-El trapped on Argo.
64	22	"Make it Reign"	Armen V. Kevorkian	Ray Utarnachitt & Cindy Lichtman	June 11, 2018 (2018-06-11)	T13.20672	1.76
Coville, Selena, and the other Kryptonians begin a ritual at the Fortress of Sanctuary to summon Reign back to Earth. However, her body will not completely form and Selena determines they require blood from Pestilence and Purity. Sam undergoes testing at the DEO and M'yrnn and J'onn begin the Reach. Kara uses Alura's hologram crystal to contact Winn and explain Selena's plan to conquer Earth. Winn replicates a portal in the DEO as Mon-El fixes the one on Argo to travel between Argo and National City. The Kryptonians break into the DEO to locate the Worldkillers' blood. Kara, Alura, and Mon-El travel back to Earth to join the fight and the Kryptonians leave once they possess the blood. They complete the ritual, but Selena kills Coville. Lena determines that, as Reign gets stronger, Sam gets weaker. Alura reveals there is a fountain that can strengthen Sam and weaken Reign; Sam travels to Juru to find it. Reign begins traveling to the Earth's core with the sword of Juru to terraform Earth into a new Krypton, setting off earthquakes.
65	23	"Battles Lost and Won"	Jesse Warn	Robert Rovner & Jessica Queller	June 18, 2018 (2018-06-18)	T13.20673	1.78
As the earthquakes worsen, Supergirl, Alura, Guardian, and the DEO protect National City; Imra and Brainiac 5 return to help. M'yrnn gives J'onn one final memory before merging with the Earth to stop the terraforming; the heroes defeat the priestesses. Sam finds the fountain in Juru and makes peace with her mother. She drinks from the fountain and defeats Reign using the sword. However, this leads to Sam, Mon-El, and Alura dying, so Supergirl goes back in time and changes the outcome of their fight using the Harun-El. Brainiac 5 decides to stay on present-day Earth because a distant relative has started wiping out all other AI and asks Winn to take his place with the Legion. Winn accepts his offer and travels to the future with Mon-El. J'onn steps down from the DEO and promotes Alex as director. Offscreen, James publicly confesses that he is Guardian. Kara decides to stay on Earth instead of returning to Argo with her mother. Sam, completely rid of her Kryptonian side, returns to her life with Ruby. Lena gives Alura all of the Harun-El and a mathematical formula to create more, but synthesizes a portion for secret experiments. A duplicate Kara appears in Siberia at the same time Reign is defeated with the Harun-El. This episode marks Jeremy Jordan's final episode as a series regular.

Season 4 (2018–19)

Main article: Supergirl season 4

Supergirl, season 4 episodes

No. overall	No. in season	Title	Directed by	Written by	Original air date	Prod. code	U.S. viewers (millions)
66	1	"American Alien"	Jesse Warn	Story by: Robert Rovner & Jessica Queller Teleplay by: Gabriel Llanas & Aadrita Mukerji	October 14, 2018 (2018-10-14)	T13.21201	1.52
Kara has stayed busy in her heroic duties working with the D.E.O., and as a reporter at CatCo proving she can multitask. Brother and sister Otis and Mercy Graves attack an alien, Dr. Vose, and steal an EMP device from his lab. J'onn believes it to be a hate crime, with the recent rise in anti-alien hatred in the country, although Kara disagrees. The duo plan to attack President Marsdin's summit to mark the anniversary of her amnesty act. Supergirl saves the President and captures Otis, but Mercy escapes. Camera footage of the attack ends up exposing the President's true identity as an alien. Meanwhile, Alex and Brainy struggle to communicate with each other at the D.E.O. The Graves are working with a mysterious masked individual who says he is an "agent of liberty" as he stabs Fiona Byrne, an alien telepath that J'onn had met in a support group for other aliens. The duplicate Kara is seen punching through walls in a cavern surrounded by Kasnian soldiers.
67	2	"Fallout"	Harry Jierjian	Story by: Dana Horgan Teleplay by: Maria Maggenti & Daniel Beaty	October 21, 2018 (2018-10-21)	T13.21202	1.34
In the wake of President Marsdin's outing as an alien, a wave of anti-alien sentiment spreads across the country. Marsdin resigns, leaving Vice President Baker to replace her. Mercy hacks L-Corps' image inducers to disable them, in an effort to force aliens out of hiding. When Brainy is outed to a pizzeria, he is rattled by the hatred he faces. J'onn continues to investigate his friend's disappearance and the trail leads him to Agent Liberty, who holds an anti-alien rally. At L-Corp, Mercy and Lena fight, each using an arm piece of Lex's exoskeleton. Mercy is captured by Supergirl and held at the D.E.O. with Otis. Nia, who reveals herself to be transgender, convinces James to write an editorial against anti-alien hatred. Mercy and Otis convince an agent, Jensen, to release them. Using Lena's lead dispersion device, the three send Kryptonite into the atmosphere, which hits Supergirl mid-flight, making her pass out and fall to the ground.
68	3	"Man of Steel"	Jesse Warn	Rob Wright & Derek Simon	October 28, 2018 (2018-10-28)	T13.21203	1.28
J'onn catches Kara before she crashes to the ground; he brings her to the D.E.O. and the Kryptonite in the atmosphere continues to weaken her. In an effort to keep her safe while a cure is found, Lena outfits Kara in a prototype armor that will help filter the Kryptonite out of her system. In a series of flashbacks, Ben Lockwood, a university professor, and his family suffer a series of personal tragedies that slowly turn him against aliens and lead him into the path of Mercy Graves, who gives him the Agent Liberty armor. Back in the present, Ben prevents Mercy and Otis from killing Jensen by blackmailing the young agent into breaking them into D.E.O. headquarters.
69	4	"Ahimsa"	Armen V. Kevorkian	Story by: Eric Carrasco Teleplay by: Katie Rose Rogers & Jess Kardos	November 4, 2018 (2018-11-04)	T13.21204	1.23
With the air still Kryptonite-saturated, Kara is not permitted to leave the D.E.O. and fight as it may damage the suit and kill her. Lena and Brainy devise a method to filter the Kryptonite out of the atmosphere. A second D.E.O. agent turns rogue and breaks two aliens out. Mercy kills him after he brings the aliens to her. J'onn meets Manchester Black, Fiona's fiancé. Ben hypnotizes the aliens, using Fiona's empathic powers, into committing chaos, to give justification for killing aliens. As they attack a carnival, Supergirl fights until her suit is damaged. J'onn and Manchester join the fight and find Fiona, forcing Jensen to deactivate the alien device, breaking the hypnosis on the aliens. Mercy and Otis corner Alex and Supergirl where Otis threatens to expose Supergirl to the Kryptonite-filled air. One of the aliens kills Mercy and Otis as the air is completely cleared of Kryptonite. J'onn is only able to ease Fiona's pain before she dies. Later, Ben transfers a parasite into Jensen, and Manchester purchases lethal weaponry. President Baker assigns Colonel Lauren Haley to be Alex's commanding officer at the D.E.O.
70	5	"Parasite Lost"	David McWhirter	Maria Maggenti & Aadrita Mukerji	November 11, 2018 (2018-11-11)	T13.21205	1.16
The parasite enables Jensen to absorb an alien's powers through touch, while also killing them. Jensen uses his powers in public and weakens Supergirl enough to escape. Kara and Nia interview a healer alien, Amadei, to counter the anti-alien rhetoric. Amadei is then attacked and left to die without his healing amulet. J'onn and Kara discover the amulet was stolen for the Children of Liberty, to stop Jensen's new powers from killing him. Colonel Haley obtains uranium to use against Jensen and the D.E.O. sets up a containment dome to limit the blast radius. James and Lena meet Ben Lockwood at a media summit, where James asserts that Guardian does not stand for Ben's anti-alien sentiments. Alex convinces Jensen to remove Amadei's amulet, leading to him becoming brain-dead. James believes that if he understands the anti-alien movement, he can get those people to listen, so he contacts Ben.
71	6	"Call to Action"	Antonio Negret	Gabriel Llanas & Daniel Beaty	November 18, 2018 (2018-11-18)	T13.21206	1.13
Masked citizens calling themselves the Children of Liberty patrol the streets, attacking innocent aliens. Supergirl and Manchester intervene and chase them off. Anti-alien manifestos entitled "Twilight's Last Gleaming" rain down on them. Manchester has Children of Liberty member Petrocelli held captive to torture him for information. Haley reprimands Supergirl for intervening in the attack and refuses to use D.E.O. resources to investigate the manifesto. Lena and Eve are frustrated that their experimental trials with the Harun-El rock are not successful. Kara replaces James on a television show where she ends up debating Ben Lockwood, who gets the best of her. James meets Tom, a Children of Liberty member, and they patrol neighborhoods with a dog that can detect aliens hiding. Then the group starts putting together the clues: the alien-sensing dog allowed the Children of Liberty to identify alien houses, and the special lenses that Manchester discovered in Petrocelli's mask will allow the Children to see the infrared marks. At CatCo, Nia's narcolepsy alarms Kara and James. Brainy removes the infrared marks and defeats a group of Children and Kara saves an alien family from Children.
72	7	"Rather the Fallen Angel"	Chad Lowe	Dana Horgan & Katie Rose Rogers	November 25, 2018 (2018-11-25)	T13.21207	1.15
Supergirl is lured by Manchester to Shelley Island, an alien immigration center and monument site where their powers are dampened, where the Children of Liberty detain her and lock her inside the monument and set it to detonate. Manchester previously made a deal with the Children to meet Agent Liberty, but the one he meets is not Ben. James investigates the area, and is almost convinced by the Children to detonate the monument. Kara, whose powers are only partially drained, manages to attract his attention with her heat vision. Manchester, realizing the Children were playing him, destroys the power dampeners, allowing her to escape while Manchester and James fight off the Children. Meanwhile, Lena proceeds with her experiments to enhance humans in an effort to "level the playing field" between humanity and super-beings. She takes on a volunteer, Adam, who dies during the trial, after bonding with Lena through their shared motivational grief. James, unaware of the experiments, goes to make up with Lena. Kara, Alex and Brainy are visited by J'onn who is upset about not being able to stop Manchester from killing people.
73	8	"Bunker Hill"	Kevin Smith	Rob Wright & Eric Carrasco	December 2, 2018 (2018-12-02)	T13.21208	1.26
Nia wakes up suddenly from a dream involving Agent Liberty. Kara and J'onn look through Manchester's apartment and find his brass knuckle, which J'onn used to communicate with him telepathically in a desperate attempt to dissuade of his current course of action. Kara and Brainy help Nia with her dreams which lead to the old Lockwood Factory, where Manchester Black had pursued Ben as Agent Liberty to after exposing his secret to his wife. Kara stops Manchester Black from killing Ben's wife and sends Ben and Manchester to prison where the latter is visited by J'onn. Later, President Baker demands Supergirl to reveal her secret identity to him to improve his poll ratings. She refuses, so Baker fires her from the D.E.O. She later observes Ben as he is being remanded to prison, where his wife incites a crowd of protestors in support of her husband as Ben remarks that he's far from finished.
74	9	"Elseworlds, Part 3"	Jesse Warn	Story by: Marc Guggenheim Teleplay by: Derek Simon & Robert Rovner	December 11, 2018 (2018-12-11)	T13.21209	2.17
Barry Allen and Oliver Queen wake up as wanted criminals hunted by John Deegan as a black suited Superman while Kara is imprisoned at S.T.A.R. Labs, with a rewritten Alex guarding her. After narrowly escaping Deegan, Barry and Oliver locate Cisco Ramon, who works as a mob boss with James as a henchman, and retrieve Superman from Earth-38. Supergirl convinces Alex to release her, and together with Barry retrieves the Book of Destiny. Superman uses the book to return Barry and Oliver to their original forms, but Deegan steals it back. Barry and Kara travel in opposite directions to slow the Earth's rotation in order to impede Deegan, despite Clark saying it will kill them. With help from Lois, Brainy, and J'onn, Superman and Oliver successfully defeat Deegan and restore Earth-1 to normal. On Earth-38, Clark reveals Lois is pregnant, and they are going to be moving to Argo City for a while, leaving Earth in Kara's hands. Clark proposes to Lois and she accepts. On Earth-1, Oliver gets a call from Batwoman, revealing Deegan is in Arkham and has seemingly made friends with the Psycho-Pirate, who teases a future crisis. This episode concludes a crossover event that begins on The Flash season 5 episode 9 and continues on Arrow season 7 episode 9.
75	10	"Suspicious Minds"	Rachel Talalay	Maria Maggenti & Gabriel Llanas	January 20, 2019 (2019-01-20)	T13.21210	1.04
Kara finds a boat where a man named Randall McAllister is killed and dragged into the ocean by a slightly visible alien. Colonel Haley dismisses Kara from the crime scene because of her continued refusal to reveal her identity. All the D.E.O. agents who know Supergirl's identity, including Alex, agree to resist Haley's interrogations. Kara, Alex and J'onn learn that the attackers were Morai, a trio of aliens with the ability to turn invisible with only Kara being able to see them. One Morai kills itself to avoid Haley, who, alongside McAllister, tortured them to be weapons. Two more Morai infiltrate the D.E.O., and Brainy marks them with a paintball gun so the agents can see them. Haley re-enables the use of lethal weaponry, killing one of the Morai. Haley and Alex are saved by Supergirl from the last Morai. Haley realizes that Supergirl is Kara, and tries to blackmail her back into the D.E.O. before Alex incapacitates her. J'onn wipes Haley's mind of Supergirl's identity, but Haley remains determined to discover it, bringing in an alien truth-seeking creature to ferret out the secret. To keep Kara's identity safe, Alex has J'onn wipe everyone's memory of Supergirl's identity including her own.
76	11	"Blood Memory"	Shannon Kohli	Jessica Queller & Dana Horgan	January 27, 2019 (2019-01-27)	T13.21211	1.34
The Supergirl clone falls into a coma. The Russians try to revive her, but sends purple lightning around the globe; causing illegal tablets to glow purple. People taking the purple drugs temporarily transform into unstoppable monsters, catching the D.E.O.'s attention. While chasing these monsters, Kara has a disconnect with Alex due to her no longer remembering her secret identity. Alex feels that something inside her is missing, so she asks J'onn to take a look. J'onn and Brainy agree to place a placebo in Alex's mind to cover the truth. Meanwhile, Nia reveals to Kara that she is transgender and that she has ill confidence about her family when due to developing the unwanted Dreamer powers that occur to one female in every generation in her family. Nia's sister (who was taught dream interpretation while expecting to gain the powers) discovers Nia has the powers and regretfully renounces her. Kara reveals her identity to Nia to reassure her. While Nia's mother lies dying of a spider bite, Nia uses her powers to talk to her mother about them, who assures her she'll be able to continue the dreamer line.
77	12	"Menagerie"	Stefan Pleszczynski	Story by: Robert Rovner Teleplay by: Daniel Beaty & Greg Baldwin	February 17, 2019 (2019-02-17)	T13.21212	1.15
After a meteor crash lands, Pamela Ferrer, a thief, and her boyfriend are caught in a car crash. A symbiotic, snake-like alien parasite known as Menagerie inhabits Pamela's body. Meanwhile, Brainy requests Nia to train with him but refuses as she is still grieving her mother, although she decides to invite Brainy to a Valentine's Day party. Alex decides to give advice for Brainy. Lena decides to share her research with the government, causing James to break up with her as that could be weaponized. Ben convinces his son to lead the Children of Liberty. After, the D.E.O. track down Pamela who attacks the Valentine's Day party. Following a confrontation with Kara, Nia and the Children of Liberty, the parasite is (apparently) killed. Pamela is arrested and put in prison where she gets a message from Manchester Black. President Baker realizes crimes are only considered terrorist attacks if they are against humans, not aliens, forcing him to release Ben from prison. It is revealed that the symbiote is still alive.
78	13	"What's So Funny About Truth, Justice, and the American Way?"	Alexis Ostrander	Eric Carrasco & Aadrita Mukerji	March 3, 2019 (2019-03-03)	T13.21213	1.14
Manchester breaks out of prison with Hat and Menagerie who together form "The Elite," along with a Morai. Hat is revealed to be an alien whose Bowler hat has fifth-dimension properties. Meanwhile, Brainy trains Nia at the Fortress of Solitude. Supergirl confronts President Baker to convince him to prevent a missile launch carrying a satellite which would destroy any alien ship coming to Earth, but he refuses. Later, Supergirl, Nia, Brainy, Alex, and J'onn stop The Elite, while Supergirl learns that the Claymore satellite has been reprogrammed to destroy The White House. She redirects the satellite so that it fires at a body of water and then destroys it. However, Manchester manages to flee with the Legion ring he stole from Brainy during their confrontation. Ben is offered to be Director of Alien Affairs by the President. At the same time, Alex begins distrusting Baker after Haley confirms that the President took action against protocol; to this end, she offers Lena anything she needs for her research. After being visited by Supergirl following the incident, Baker makes Ben the Director of Alien Affairs but denies his request to deputize the Children of Liberty.
79	14	"Stand and Deliver"	Andi Armaganian	Rob Wright & Jess Kardos	March 10, 2019 (2019-03-10)	T13.21214	1.05
Ben starts a revolution against aliens, attempting to repeal the Alien Amnesty Act, which gets The Elite's attention and they decide to help the aliens resist against the humans. However the revolution eventually fails when aliens and humans begin to bond. Supergirl, Nia and J'onn defeat the Morai, The Hat and Menagerie. J'onn fails to stop Manchester so he decides to begin a manhunt. At Cat Co, James gets shot by an unknown figure.
80	15	"O Brother, Where Art Thou?"	Tawnia McKiernan	Derek Simon & Nicki Holcomb	March 17, 2019 (2019-03-17)	T13.21215	1.07
Four years ago, Lena's brother Lex created a red sky over Metropolis to take down Superman, but was caught and sent to prison. In the present, Lex is released due to a disease, so Lena helps him by working on a cure. Meanwhile, J'onn and Kara continue investigating Manchester, who confronts the two by using the Martian Staff of Kolar, which triggers J'onn's traumatic memories. Lena decides to use the cure on a temporarily dead James. Though his sister Kelly tries to stop her, Alex convinces Kelly to stop. Just before Lena's able to, Manchester causes a power outage across the city, so Kara and J'onn confront him again. J'onn kills Manchester while Kara stops the city from being flooded. The following day, Lena reveals that Lex cut off the backup power, and he also admits that Otis (thought dead) shot James on Lex's orders all so that Lena would have no choice but to test the cure on him. It is also revealed that Eve was working with Lex and Otis this whole time. Otis chloroforms Lena, leaving Eve to look after her. Lex escapes with Otis, but is stopped by Supergirl.
81	16	"The House of L"	Carl Seaton	Dana Horgan & Eric Carrasco	March 24, 2019 (2019-03-24)	T13.21216	1.12
Three years ago, Lex was put on trial for mass murder but before going to prison he is visited by Eve (revealed to be a fangirl of Lex), who is hired by Lex to go undercover to spy on James. Nine months ago, the Kaznians found a stray, amnesiac copy of Supergirl, who was created from Harun-El, and informed Lex about this four months later. Since then, the Kaznians have been training the Supergirl copy while Lex raised and manipulated her for his own uses, teaching her a biased history about her rival, the original Supergirl. It is also revealed that Lex planned for Lena to test the cure in order to save the Supergirl copy from a sudden illness that rendered her comatose due to her being created from Harun-El. Lex gives the cure to the Supergirl copy whom he names Red Daughter. In the present, Lex is revealed to possess metahuman powers, which he uses to escape from Supergirl.
82	17	"All About Eve"	Ben Bray	Story by: Gabriel Llanas Teleplay by: Katie Rose Rogers & Brooke Pohl	March 31, 2019 (2019-03-31)	T13.21217	1.06
Supergirl teams up with Alex and Lena to track down Eve. They find her cousin Bitsie, whom they learn was given the cure to eradicate her cancer; persuaded to help, Bitsie reveals the location of Eve's old lab. It is revealed that Eve shot James and used the Kryptonite heart used for Metallo to resurrect Otis. Supergirl finds Black Kryptonite in the vault, with Lena explaining she created it and it has been the basis of her medical research. Supergirl reveals her concerns about people like Lex gaining powers and her not being able to stop them. J'onn leaves the planet after seeing a vision of his father. During a press conference at the White House, in which the Alien Amnesty Act is officially repealed, Red Daughter attacks disguised as Supergirl to turn public opinion against the latter. President Baker declares martial law against Supergirl, who is now public enemy number one, though Alex, Lena and Haley all believe she is innocent. While attending the press conference, James is left unable to move out of fear, so he turns to his sister for therapy.
83	18	"Crime and Punishment"	Antonio Negret	Story by: Rob Wright Teleplay by: Lindsay Sturman & Aadrita Mukerji	April 21, 2019 (2019-04-21)	T13.21218	0.99
Red Daughter attacks the White House disguised as Supergirl, but James, Nia, Alex, Lena, Brainy, and Haley are not fooled. Ben demands the use of the DEO's alien weapons to arrest Supergirl. Brainy realizes Ben will come for the alien registry next, so he downloads a copy of it before deleting the original. A reluctant Haley agrees to Ben's request, and borrows Alex's signal watch. Alex lies about how to summon Supergirl. Despite seeing through it, she presses it so that Supergirl does not show up, so Ben makes off with the weapons. Baker grants Ben's previous request to deputize the Children of Liberty. James has another PTSD episode but the psychiatrist's anti-PTSD advice has little effect due to his powers surfacing. Supergirl and Lena visit Stryker's island for information and discover Lex's hidden room. Otis, now an advanced Metallo, attacks Supergirl and starts a prison riot before self-destructing in the secret room. Eve secretly works on rebuilding Otis. Steve Lomeli, Lex's cell neighbor, gives her a flash drive on the room. Supergirl is framed for the riot, so Kara decides to stop being Supergirl for a while, claiming to Alex and Lena she is "going into hiding."
84	19	"American Dreamer"	David Harewood	Story by: Dana Horgan Teleplay by: Daniel Beaty & Jess Kardos	April 28, 2019 (2019-04-28)	T13.21219	1.14
With Kara ceasing to operate as Supergirl, Dreamer takes her place as National City's superhero. Ben returns to his duties as Agent Liberty. Now deputized, he and the Children of Liberty begin arresting innocent aliens. His son realizes his best friend is an alien, having kept this a secret because of Ben's policies, which makes him reconsider his parents' anti-alien propaganda. Brainy and Kelly try to discover the source of James's PTSD, discovering that panic attacks make his powers develop faster; his powers are revealed to be identical to Kryptonians. Kara works to clear Supergirl's name, as she and Lena discover Lex's link to Kaznia, as well as a company called AmerTek. An alien whose husband was arrested by the Children of Liberty kills Ben's wife. J'onn completes his mission on Mars.
85	20	"Will the Real Miss Tessmacher Please Stand Up?"	Shannon Kohli	Story by: Derek Simon Teleplay by: Katie Rose Rogers & Natalie Abrams	May 5, 2019 (2019-05-05)	T13.21220	1.05
James tests his powers in the Fortress of Solitude. Lena and Kara go to Kaznia for information on Lex and discover Red Daughter's existence as well as her role in Lex's plot to invade America. Eve creates clones of herself to throw the duo off and sets off the facility's self destruct. Kara discovers and burns Red Daughter's room and realizes Lex knows that she is Supergirl. She and Lena defeat the Eve clones and escape; having collected evidence of the impending invasion. The D.E.O. tracks down Ben's wife's murderer. Ben orders all aliens at that location to be arrested, but his soldiers are convinced to disobey orders by Brainy. Ben takes the super serum to arrest them himself, but he is subdued by a returning J'onn. Ben is denounced by his son because of his anti-alien rhetoric. Kara meets Baker in his office to warn him about Lex's plot, but he has her black-bagged, revealing he is in on the plot.
86	21	"Red Dawn"	Alexis Ostrander	Story by: Lindsay Sturman Teleplay by: Gabriel Llanas & Eric Carrasco	May 12, 2019 (2019-05-12)	T13.21221	1.11
Baker has had the CatCo servers wiped, terminating Kara's evidence. Kara escapes an execution at the hands of Red Daughter. Lena interrogates Ben about Lex's plan, but he is unaware of it. Ben's hair begins to fall out as he has taken an untested Harun-El. J'onn, Brainy, and Nia infiltrate an AmerTek factory to save the aliens there, but are captured. One of the agents strikes Brainy in the forehead, inadvertently causing him to behave like his ancestors while rebooting. He escapes and betrays J'onn and Nia, getting them deported with the other aliens. Ben finds Otis, who unknowingly reveals that Lex plans to betray Kaznia before getting killed by him. Lena places a baby truth creature around Lillian's arm and is convinced by her to add more Harun-El to James after he becomes traumatized. Red Daughter appears at Alex's home, disguised as Kara, before Supergirl arrives and fights her. Alex remembers again that Kara is Supergirl. Red Daughter nearly kills Kara, but Lex apparently kills Red Daughter on television. Baker lies that he killed Supergirl, framing her as the mastermind behind the Kaznia invasion. Haley calls Alex to inform her about the true purpose of the Claymore satellite: it has enough energy to power a Lexosuit.
87	22	"The Quest for Peace"	Jesse Warn	Story by: Robert Rovner & Jessica Queller Teleplay by: Rob Wright & Derek Simon	May 19, 2019 (2019-05-19)	T13.21222	1.07
Lex has framed himself as a hero for stopping his self-initiated Kaznian invasion. J'onn and Nia are sent to Shelley Island, where enslaved aliens are setting up a Claymore satellite on Lex's orders to destroy Argo, where Superman is. When Lex and Baker find out Ben killed Otis, they make it seem like he is responsible for Lex's crimes. Ben watches as Baker makes Lex the new Director of Alien Affairs. Kara recovers her evidence from Brainy and publicly exposes Lex and Baker. J'onn and Nia escape and overload the satellite, while Brainy returns to his normal-self. Kara, Alex and James arrive at Shelley Island and fight Lex and Ben. James and Ben remove the Harun-El from each other, while Red Daughter, who was held captive on the island, sacrifices herself to save Kara. She fuses with Kara, who uses her newfound powers to destroy the Lexosuit. Lex teleports away, but is ambushed by Lena, who removes the Harun-El from him, before shooting him. However, before dying, Lex reveals to Lena that Kara is Supergirl in an attempt to embitter her, which succeeds. Ben and Baker are arrested, while the Vice President re-initiates the Alien Amnesty Act. Kelly and Alex reveal their feelings for each other. Eve tries to escape, but is intercepted by a representative of Leviathan, who refuses to let her go despite Lex's failure, revealing they forced her to work for Lex. Elsewhere, The Monitor releases J'onn's brother on Earth before retrieving Lex's corpse.

Season 5 (2019–20)

Main article: Supergirl season 5

Supergirl, season 5 episodes

No. overall	No. in season	Title	Directed by	Written by	Original air date	Prod. code	U.S. viewers (millions)
88	1	"Event Horizon"	Jesse Warn	Derek Simon & Nicki Holcomb	October 6, 2019 (2019-10-06)	T13.21801	1.26
After discovering Kara Danvers' secret identity from her brother Lex Luthor before she killed him, Lena fights Kara in a virtual simulation and has built an A.I. named Hope to talk to as she no longer trusts anyone. Meanwhile, Andrea Rojas acquires CatCo, replacing James Olsen as editor-in-chief, and employs tabloid journalism to increase subscription numbers. Alex Danvers convinces Kara to tell Lena that she is Supergirl, so she tells her at a party celebrating her Pulitzer Prize. Suddenly, the party is attacked by Midnight, a Phantom Zone prisoner that J'onn J'onzz defeated years prior. Kara reconciles with and reveals her identity to Lena before using a new suit Brainy created for her to stop a black hole Midnight opened and send her back to the Phantom Zone. While Kara shows more openness to Lena about her secret, Lena re-enters the simulation to vent; pledging to use Kara's trust to "fix mankind". James quits CatCo, refusing to support Andrea's sensationalist plans. Elsewhere, J'onn's brother, Malefic, vows to get revenge himself following Midnight's failure despite J'onn not remembering having a brother while Eve Teschmacher returns to National City on Leviathan's orders, but gets black-bagged.
89	2	"Stranger Beside Me"	David McWhirter	Dana Horgan & Katie Rose Rogers	October 13, 2019 (2019-10-13)	T13.21802	0.97
With Kelly Olsen's help, J'onn learns that his memories of the Martian Civil War were altered, but that Malefic was his brother who betrayed the Green Martians to aid the White Martians. J'onn and Malefic receive immense pain whenever they attack one another due to a curse, which J'onn still suffers from, so he asks Kelly to soothe his pain using Q-waves, but Malefic secretly sees this and realizes Q-waves can help further his revenge against his brother. Meanwhile, Lena reveals to Eve her plan to use Andrea's technology to improve humanity by giving them Hope's altruism and loyalty before having Hope take over Eve's body. Elsewhere, Kara chafes at her new work assignments, and rival reporter William Dey seems to be on the trail of her secret identity.
90	3	"Blurred Lines"	Eric Dean Seaton	Lindsay Sturman & J. Holtham	October 20, 2019 (2019-10-20)	T13.21803	0.92
J'onn requests Nia Nal's help in delving deeper into his past, finding that he used his telepathy to erase Malefic from his father's memory since the latter blamed himself for Malefic's isolation due to his unstable power. Malefic attacks Kelly, who he tricked into revitalizing his suppressed mind control powers, but escapes after a confrontation with J'onn. Kelly is revealed to have developed a psychic link with Malefic when she returned his powers and identify him in a shapeshifted form. Meanwhile, Kara, Alex, and James track down an alien with the ability to shoot cobwebs. They find the culprit in former special ops commander Caroline O'Connor, who is possessed by the spider-like Aurafacian symbiotes. Alex uses a device to remove the Aurafacians from Caroline's body. However, she is later mysteriously killed by an unknown person before she can be taken into D.E.O. custody. Lena asks Kara to steal Lex's childhood journal and discovers his research on mind control. Nia confronts Brainy about their relationship.
91	4	"In Plain Sight"	David McWhirter	Jay Faerber & Jess Kardos	October 27, 2019 (2019-10-27)	T13.21804	0.95
With Nia's help, Kara discovers that William is an undercover reporter who suspects that Andrea is a criminal. She prevents a new supervillain called Breathtaker from assassinating Elena Torres and has her remanded to the DEO. Meanwhile, James and Kelly return to their hometown, which they find corrupted by the presence of a new prison, where people receive unjustly long prison sentences for minor crimes. They meet a teenager named Simon, who James helps in his mother's case. Elsewhere, Malefic takes control of Alex, but she is saved by Kara and J'onn and seemingly send him to the Phantom Zone. Brainy and Nia reconcile their relationship and James leaves National City to take over his hometown newspaper. Unbeknownst to Kara and her allies, Malefic was teleported into Lena's office instead, where Lena forges an alliance with him. This marks Mehcad Brooks' final episode as a series regular with the departure of James Olsen from National City.
92	5	"Dangerous Liaisons"	Alysse Leite-Rogers	Rob Wright & Daniel Beaty	November 3, 2019 (2019-11-03)	T13.21805	0.78
Lena promises to help Malefic overcome his inhibition to kill J'onn in exchange for experimenting on him to duplicate his mental inception power. However, she reneges and uses the power to keep him in captivity. Kara and William pursue leads involving an assassin called Rip Roar, who William believes killed his friend, Russell Rogers, and is working for the Rojas family. Rip Roar steals a laser weapon from an Army base and uses it to cause a devastating flood, though Supergirl, J'onn, and Dreamer are able to prevent mass casualties and capture the assassin. It is later revealed that Rip Roar is Rogers, knows Andrea, and is under the control of Leviathan instead. Meanwhile, Andrea successfully launches her new VR product, where Dey confronts a simulation of Andrea that he made. Andrea is visited by an elderly representative of Leviathan, Margot, who informs her about what happened to Rip Roar.
93	6	"Confidence Women"	Shannon Kohli	Dana Horgan & Nicki Holcomb	November 10, 2019 (2019-11-10)	T13.21806	0.84
Flashbacks show how Andrea and Lena met, and how their friendship became strained. While searching for the acrata medallion, Andrea has her first encounter with Leviathan, who put her up to killing Governor Harper and Caroline O'Connor by telling her how the medallion works. To further their goals, Leviathan brainwashes Rogers into becoming Rip Roar to act on their behalf. In the present, Andrea is assigned to eliminate the captured Rogers, but her first attempt to break into the D.E.O. fails. After going to Lena for help, Andrea sets up a fake break-in for Supergirl to investigate while she raids the D.E.O. headquarters once again with psychic tech as the masked Acrata; making off with Rip Roar even in spite of Supergirl's intervention. During the raid, Supergirl discovers the assassin's connection to Leviathan. Andrea gives Lena the medallion and attempts to run away with Rogers, but a Leviathan operative kills him before another of their representatives meets with her. Though she says she does not have the medallion anymore, she is told that it merely activated her powers, which actually came from the darkness within her. Elsewhere, Alex and Lena independently continue to learn more about Leviathan.
94	7	"Tremors"	Andi Armaganian	J. Holtham & Katie Rose Rogers	November 17, 2019 (2019-11-17)	T13.21807	0.79
Margot fails to get the medallion back from Lena, forcing Leviathan to take action. Meanwhile, J'onn begins to have visions of Malefic. When he asks his father's spirit for help, he suggests J'onn should attempt to bond with his brother, no matter the outcome. The bond is successful, and Malefic forgives J'onn. Back at the D.E.O., Brainy discovers Leviathan's location and travels there with Alex while Lena and Kara search for a weapon in the Fortress of Solitude to defeat the organization. Suddenly, they are attacked by Rama Khan, a centuries old alien and agent of Leviathan who can manipulate the Earth. While fighting him, Kara manages to suppress Khan's powers, forcing him to retreat. Afterwards, Lena admits to Kara she killed Lex, knew her secret before she told her, and rants about how she broke her trust and deserves to feel her pain. Lena ignores Kara's attempts to reason with her and leaves her trapped in kryptonite gas.
95	8	"The Wrath of Rama Khan"	Marcus Stokes	Lindsay Sturman & Jess Kardos	December 1, 2019 (2019-12-01)	T13.21808	0.87
Alex and Brainy save Kara from the Fortress' trap. Alex tells Kara that Lena is beyond redemption, but Kara disagrees. Meanwhile, Andrea joins Kara and J'onn in fighting Khan while Lena prepares to mind-control all of Earth with Q-waves. In response, the D.E.O. has Malefic use his own Q-waves to repel them. Kara subdues Khan before Andrea seals him in a tar pit before they attack Leviathan's hideout. After breaking up the fight, Andrea flees just as Leviathan operative Gamemnae relieves Khan of his duties. When Lena and Hope are discovered, the latter takes the fall as Eve and is arrested. Later, Malefic decides to return to Mars, and the Monitor reveals to J'onn that he brought Malefic to Earth to test him for the impending crisis, which he passed by reconciling with his brother. Unbeknownst to anyone, the Monitor has resurrected Lex and is also preparing him for the crisis; fulfilling the latter's desire to become a hero in exchange for helping him with a favor involving Lena.
96	9	"Crisis on Infinite Earths: Part One"	Jesse Warn	Story by: Robert Rovner & Marc Guggenheim Teleplay by: Derek Simon & Jay Faerber	December 8, 2019 (2019-12-08)	T13.21809	1.67
As the Crisis begins, Brainy detects an anti-matter wave approaching Argo City, so Kara warns her mother Alura Zor-El, her cousin Clark Kent, and his wife Lois Lane. The Kents narrowly send their son Jonathan off-world just as the wave hits Argo. Meanwhile, on Earth-1, Harbinger brings Barry Allen, Kate Kane, Oliver Queen, Mia Smoak, Sara Lance, and Ray Palmer to Earth-38 and rescues the Kents. As Harbinger briefs the heroes on the Anti-Monitor, the Monitor raises a quantum tower to impede the anti-matter wave while the DEO and Lena work to evacuate Earth-38. After learning Jonathan ended up on Earth-16, Lois, Sara, and Brainy leave to get him. In preparation, Oliver passes the mantle of Green Arrow to Mia but, when he learns Barry is fated to die, he argues with the Monitor over the deal they made last year. The heroes fend off an army of shadow demons until the Monitor breaches them off-world. However, Oliver stays behind, sacrificing himself to ensure the exodus succeeds. On Earth-1, Lois' team returns with Jonathan before the Monitor brings a dying Oliver to share his good-byes. Nash Wells, now a "pariah" for releasing the Anti-Monitor, appears, announcing everything is doomed. This episode begins a crossover event that continues on Batwoman season 1 episode 9, The Flash season 6 episode 9, and Arrow season 8 episode 8, and concludes on Legends of Tomorrow's special episode.
97	10	"The Bottle Episode"	Tawnia McKiernan	Story by: Derek Simon Teleplay by: Nicki Holcomb & Jen Troy	January 19, 2020 (2020-01-19)	T13.21810	0.84
Following the Crisis and her Earth being merged with Earth-1, Kara adjusts to her new life on Earth-Prime when she discovers she is working for Lex, who is now the owner of the D.E.O. and Leviathan is no longer a public threat while J'onn restores their allies' pre-Crisis memories. Four alternate Brainiac-5's, who had survived the Crisis, suddenly appear on Earth-Prime. They are unsure of how it happened, though they know they are being targeted by the Anti-Life Equation. Nia discovers that one of them plans to bring back his Earth, which he trapped inside a bottle. However, she, Kara, and Brainy defeats the desperate Brainiac-5, who makes peace with the team and decides to live in the bottled Earth until Kara and her team can find a way to bring it back. Before the other Brainiacs merge with Brainy to form the "Big Brain", the female Brainiac-5 informs him that in order to defeat Leviathan, he must secretly ally himself with Lex and sacrifice his friends and relationship with Nia to do so. Elsewhere, William voices his suspicions about Lex to Kara while Gamemnae visits Andrea under the alias of board member Gemma Cooper.
98	11	"Back From the Future – Part One"	David Harewood	Dana Horgan & Katie Rose Rogers	January 26, 2020 (2020-01-26)	T13.21811	0.81
With Brainy's help, Lex breaks out a doppelganger of Winn Schott to attack a toy convention under the alias of Toyman. Just then, Winn returns from the future to stop his doppelgänger from changing his future. Kara, Alex, Winn, Nia and Brainy seek out J'onn, who has built a new base of operations called "the Tower" instead of going to the D.E.O. so he can get Winn up to speed on what happened before the Crisis. At the Tower, Nia attempts to use her powers to find Winn's doppelgänger, but instead sees Brainy turn into a white tiger. The team learn from a livestream that Winn's doppelganger plans to attack Andrea for ruining his father's reputation using robotic white tigers. Armed with this information, Kara, Winn, Nia and Brainy manage to stop him, but he gets caught in an explosion and seemingly killed. After saving Winn's future, Brainy tells him about his alliance with Lex. Unbeknownst to everyone, the alternate Winn's consciousness suddenly appears in the D.E.O.'s computers.
99	12	"Back From the Future – Part Two"	Alexis Ostrander	Rob Wright & J. Holtham	February 16, 2020 (2020-02-16)	T13.21812	0.65
The D.E.O. discover the alternate Toyman used the Obsidian Lenses to upload his consciousness into their computers moments before his death so he can weaponize the Internet. Alex places the D.E.O. on lockdown while Winn and Supergirl head to the server room. When they get there, they learn Winn's father, the original Toyman's, consciousness was also activated as he wants to help defeat his son's evil counterpart. When Winn confronts his doppelgänger's A.I., he reluctantly allows his father to buy him time. He enters the codes and foils his counterpart's plans as both Toymen's consciousnesses are deleted. Winn returns to the future to become a heroic Toyman in his father's memory. Due to what she learned from Brainy, Alex resigns as the D.E.O.'s director, so Lex swears in Brainy while procuring a copy of the data he wanted in order to get them closer to Leviathan. Meanwhile, Lex tracks down Gemma to discuss a collaboration with Obsidian Tech to improve the Obsidian Platform. Won over, Gemma advises Andrea to take the offer. She later has Margot inform the Anointed One that LuthorCorp is in their clutches as planned. While in their loft, Kara and Alex are visited by Mxyzptlk.
100	13	"It's a Super Life"	Jesse Warn	Story by: Robert Rovner & Jessica Queller Teleplay by: Derek Simon & Nicki Holcomb	February 23, 2020 (2020-02-23)	T13.21813	0.66
Mxyzptlk offers to help Kara by traveling back in time so she can tell Lena her identity before Lex can and ensure their friendship turns out differently. After several failed attempts, Kara decides to tell Lena after the latter moved to National City. However, Ben Lockwood blackmails Kara into globally revealing her identity by kidnapping Lena before killing Kara's friends and family. Then, Mxyzptlk shows Kara a reality where she and Lena did not meet, but his powers stop working. Nia saves them from danger and brings them to meet Alex, J'onn, Winn, Kelly, and Mon-El. Kara learns that Lena killed Lex before harnessing the 5th Dimension's energy for her Hope-Bots and getting Reign and a reprogrammed Brainy on her side. While her allies fight them off, Supergirl confronts Lena and Mxyzptlk looks for the Hat's namesake. Once he gets it, he undoes the reality. As nothing else worked, Kara decides to confront Lena as Mxyzptlk takes his leave; leaving a video about the day Lena and Lex started working together. Kara tells Lena that she can still help her, but will be forced to take action against her if she continues to help Lex.
101	14	"The Bodyguard"	Gregory Smith	Story by: Lindsay Sturman Teleplay by: Emilio Ortega Aldrich & Chandler Smidt	March 8, 2020 (2020-03-08)	T13.21814	0.67
Brainy informs Lex that Leviathan's members are from the same system as Krypton and that they need to find their version of Kryptonite. Supergirl thwarts an attempt on Andrea's life, so Lex assigns her to bodyguard duty so the Obsidian Platform's launch will go smoothly while pitching this idea to Gemma as a means of keeping her people out of the way. J'onn is informed of the energy that Supergirl saw during the attack and recognizes them as a Chlorophyllian's. Lena tests her program on Stryker's Island inmates, taking note when they develop vengeful feelings. Alex and J'onn find evidence that takes them to an abandoned farm where a Chlorophylloid named Todd resides. After being rescued by Supergirl, they find Todd dead and his wife Amy out for revenge on Obsidian Corp after they fired Todd for his virtual reality addiction. As Alex and J'onn rescue the workers, Supergirl successfully talks Amy down. With the danger averted, Andrea retrieves the Acrata medallion from her office. Lex visits Gemma to work out a deal, wherein he will get them something in exchange for meeting her people.
102	15	"Reality Bytes"	Armen V. Kevorkian	Dana Horgan & Jay Faerber	March 15, 2020 (2020-03-15)	T13.21815	0.68
Nia's roommate Yvette is assaulted by a man named Gregory Bauer, a vicious transphobe who catfishes and assaults transgender women to try and force Dreamer into retirement. Using her civilian identity as bait, Nia nearly kills him as Dreamer until Kara talks her down, reminding Nia of her importance to people. Meanwhile, Alex and J'onn take on a case to rescue a man trapped in virtual reality.
103	16	"Alex in Wonderland"	Tawnia McKiernan	Story by: Rob Wright Teleplay by: Jess Kardos & Mariko Tamaki	March 22, 2020 (2020-03-22)	T13.21816	0.65
Jeremiah Danvers has been found, but recently died. Alex lashes out at everyone, weary of mourning for him again. In her despair, she uses the VR Lenses to enter a fantasy where she is Supergirl. However, consumers in the virtual reality are slowly losing their grip on actual reality and believing it to be real as they develop red eyes in the real world. Alex starts to succumb to this, but is unable to use the fail safe to exit the VR world. Kelly is able to get Alex out. After learning of this danger, Andrea talks to one of her employees, a restored Eve.
104	17	"Deus Lex Machina"	Melissa Benoist	Story by: Lindsay Sturman Teleplay by: Katie Rose Rogers & Brooke Pohl	May 3, 2020 (2020-05-03)	T13.21817	0.61
Retaining his pre-Crisis memories, Lex takes note of the changes that were made while he continues his hunt for Leviathan. As part of his plans, he convinces his Leviathan double agent, Eve, to manipulate Amy Sapphire and Richard Bates as well as kill Jeremiah. After seeing Lena show sympathy to Kara, Lex tricks the former into believing Supergirl is using Myriad. As Lena leaves the Fortress of Solitude, a Morae follows her and releases a Sun-Eater. Malefic's computers detect it, prompting M'gann to return and confront it. With help from J'onn and M'gann, Supergirl shrinks the Sun-Eater. Unbeknownst to them, Lex locates the VR victims' bodies. As Kara and J'onn meet with William, they learn Lex rescued everyone and eliminated Margot. Gamemnae confronts Lex, but he persuades her to focus Leviathan's wrath on Supergirl. Following a discussion with his mother, Lex uses Lena's transportation watch to enter the Fortress of Solitude.
105	18	"The Missing Link"	Avi Youabian	Dana Horgan & J. Holtham	May 10, 2020 (2020-05-10)	T13.21818	0.62
Supergirl fights against Rama Khan and Leviathan. Lex and Lena are forced to work together when Lena's project fails to work and they get stuck inside a prison riot. Lex helps Leviathan against Supergirl. Alex and Kara meet with Pete Andrews, a man Malefic impersonated, to learn more about Leviathan. Rama Khan lets himself get captured so he can destroy the DEO's headquarters. Lena realizes she is becoming like Lex while beginning to question her own path, causing the latter to explode on her before Lena leaves. She comes to Kara's apartment to apologize for her actions. William follows Eve into an alley and is black-bagged.
106	19	"Immortal Kombat"	David Harewood	Story by: Derek Simon Teleplay by: Emilio Ortego Aldrich & Nicki Holcomb	May 17, 2020 (2020-05-17)	T13.21819	0.65
Lena tells Kara what she knows about Lex's plans, and they agree to work together to defeat him and Leviathan. Dreamer has visions of Brainy while fighting Leviathan, which she later realizes were about his secret plans. Brainy, without Lex's involvement, formulates a plan to stop Leviathan by shrinking them into a container. While the team distracts Leviathan, Brainy secretly infiltrates their headquarters. Upon learning that Leviathan plans to use the Unity Festival, Supergirl enters it to persuade its connected users to disconnect from virtual reality. Brainy puts his plan in motion when J'onn draws Leviathan's agents away. Supergirl ends the Unity Festival while Rama Khan and two Leviathan members are contained, but a weakened Brainy is unable to stop Lex from taking the container, which he and Lillian plan to use. After working together once again, Kara and Lena start to reconcile. Gamemnae, enraged, sheds her human guise.

Season 6 (2021)

Main article: Supergirl season 6

Supergirl, season 6 episodes

No. overall	No. in season	Title	Directed by	Written by	Original air date	Prod. code	U.S. viewers (millions)
107	1	"Rebirth"	Jesse Warn	Story by: Robert Rovner & Jessica Queller Teleplay by: Jay Faerber & Jess Kardos	March 30, 2021 (2021-03-30)	T13.22601	0.73
Lex Luthor brainwashes half of the planet into loving him using the Obsidian Lens and gains the combined powers of the bottled Leviathan members, intending on doing what the Anti-Monitor couldn't do; destroy all life on Earth and beyond, save only for his brainwashed followers. With the help of her team, Kara Danvers destroys Gamemnae by uploading the Anti-Life Equation into the nearest console. In order to take down Lex's satellites, Kara falsely offers herself up to Lex at the Fortress of Solitude. Lex defeats Kara's friends and sends Kara to the Phantom Zone before being depowered and arrested. Meanwhile, J'onn J'onzz and M'gann M'orzz destroy the satellites. Afterward, Lillian Luthor visits Lex at the National City Prison, but Lena Luthor uses Myriad to wipe their memory of Supergirl's identity. As Acrata, Andrea Rojas secretly buys her father's shares in Obsidian in order to restore her company. J'onn and M'gann begin searching for people to aid them in rescuing Kara, including Jonn's brother Malefic, but to no avail.
108	2	"A Few Good Women"	Jesse Warn	Derek Simon & Elle Lipson	April 6, 2021 (2021-04-06)	T13.22602	0.69
In the Phantom Zone, Supergirl meets her father, Zor-El, who survived Krypton's destruction by sending himself into the Phantom Zone and saves her from the Phantoms. Meanwhile, Alex Danvers struggle to cope with her sister's disappearance, and is consoled by J'onn. Kara's friends find a benign vampire-like Transilvanian named Silas who once broke into the Phantom Zone, and they agree to work with him. However, due to the Crisis, the Zone fractured into an archipelago and they cannot locate Supergirl as easily. With Silas's help, Kara's friends open a portal to the Phantom Zone, but they are unable to travel through and several Phantoms escape. Meanwhile, Lex's trial ends in an acquittal after he discredits Eve and Lena as witnesses, portraying them as bitter women. Nia Nal and William Dey resolve to expose Lex's crimes through their journalism. Silas later contacts J'onn stating that one of the Phantoms evaded capture.
109	3	"Phantom Menaces"	Sudz Sutherland	Dana Horgan & Emilio Ortega Aldrich	April 13, 2021 (2021-04-13)	T13.22603	0.59
A Phantom escapee attacks Silas and attempts to overtake him, and M'gann is injured while fighting it. In the Phantom Zone, Zor-El is kidnapped by Kryptonian criminals and is sent to be sacrificed to the Phantoms. Kara is injured, though she is rescued by a depowered fifth-dimensional being named Nyxlygsptlnz, a princess who knows Mxyzptlk and was sent to the Zone by her father. Meanwhile, Lena locks Lex out of LutherCorp's systems and donates all of his funds to a children's hospital. In retaliation, Lex has Otis Graves destroy it and puts the blame on a project that Lena oversaw. Kelly Olsen helps Alex cope with her sister's disappearance, and Lena talks Brainiac 5 down from a plan to murder Lex. Lena later quits LuthorCorp. Kara finds that her wounds won't heal normally in the Phantom Zone, but Nyxly heals her after Kara helps her regain her magic. They rescue Zor-El, who reveals that Alura Zor-El built the Phantom Zone, and focus on making an escape plan using Nyxly's magic.
110	4	"Lost Souls"	Alysse Leite-Rogers	Karen E. Maser & Nicki Holcomb	April 20, 2021 (2021-04-20)	T13.22604	0.59
Lena creates a weapon against the Phantoms and a way to track Kara in the Phantom Zone using Kara's DNA, but Alex later forces her to re-calibrate the device to find the Phantoms' lair as it's the only way to rescue the stolen souls. Nia has visions of Kara and Alex in Midvale High, and helps Brainy process his emotions. In the Phantom Zone, Kara, Nyxly, and Zor-El search for a mirror that can transport them home, but Zor-El is attacked. Nyxly attempts to convince Kara to leave Zor-El behind, claiming that he has been hindering her progress like her own father. Kara refuses and Nyxly reveals that she was the attacker, plans to take revenge on her father, and plots mischief on Earth. While fighting, Kara starts a self-destruct sequence and smashes the mirror to block Nyxly's escape. Sentinel, Brainy, Dreamer, and J'onn release the collected souls, restoring Silas and the transformed Phantoms. In order to get more of Kara's DNA, the team must go back in time to when Kara was in high school.
111	5	"Prom Night!"	Alexandra La Roche	Rob Wright & Jess Kardos	April 27, 2021 (2021-04-27)	T13.22605	0.50
In 2009 Midvale, with Alex away at college, Kara has been do-gooding with the help of Kenny Li (who is alive on Earth-Prime). Cat Grant tracks evidence of super-feats in Midvale for a Daily Planet story. Kara, Alex, and Kenny find Brainy and Dreamer immediately. At the same time, the poacher Professor Naxim Tork and his henchman Mitch arrive in a Bismolian ship to capture superpowered aliens for his menagerie. He plans to attract Kryptonians to a staged disaster. Kara and Dreamer use their powers to prevent the disaster, which Cat partially witnesses. She enlists a child with a small drone to investigate further. Kara resolves to break off with Kenny but then learns he has built her a "Fortress of Solitude." Brainy identifies Tork, but learns that their new activities have prevented him from being captured three days later in Uruguay by the DEO. Brainy and Dreamer track Tork down, but he captures them in a forcefield.
112	6	"Prom Again!"	Chyler Leigh	Rob Wright & Jess Kardos	May 4, 2021 (2021-05-04)	T13.22606	0.62
Kara eliminates the forcefield, and all three defeat the poachers. Brainy locks them in their ship and sets to fly them to Uruguay, but Cat observes this with her drone, finds the cloaked ship, and accidentally releases the poachers. Their interference causes Kara to be severely poisoned when she stops the meteor. When the poachers demand Kara, Kenny instead surrenders, who is taken on the ship along with Cat. Brainy, Dreamer, and Kara rescue Kenny and Cat, but also release Plutonian Land Sharks. Tork and Mitch flee, the ship becomes visible, and Kara is captured. Brainy and Dreamer travel back in time again to the first fight with the poachers, and Kara stows away on their ship. Dreamer destroys the drone, interprets her dream, and convinces Cat to quit the Planet and begin her media empire. Kara and Brainy defeat Tork and Mitch, sending them again to Uruguay. When the meteor arrives, Kara is only slightly injured and Brainy recovers her blood sample. Kara tells Kenny she will leave town for college, and invites Kenny to come with her, but he chooses to find his own destiny.
113	7	"Fear Knot"	David Harewood	J. Holtham & Elle Lipson	May 11, 2021 (2021-05-11)	T13.22607	0.47
While escaping with Zor-El, Kara experiences a Fear Vision of her friends' deaths. Brainy and Nia return with Kara's DNA, J'onn transforms the Tower into a spaceship, and they head for the Phantom Zone while M'gann stays behind to defend National City. Kelly teaches everyone how to overcome Fear Visions, leading J'onn and Alex to argue over who is more suited to retrieve Kara. A Phantom breaches containment, causing everybody to experience Fear Visions. Alex sees herself getting infected by a Phantom and sacrificing herself to draw the Phantoms away. Lena sees a Kelpie, a mythical creature that drowns everyone onboard. Kelly sees her friends infected and doubting her strength. Nia sees Brainy being sucked out of the ship after failing to interpret her dreams. J'onn and Brainy are unaffected due to their alien natures, and are able to force the Phantom back into containment, ending the Fear Visions. Kara and Zor-El are rescued and return to Earth while Nyxly secretly stows away with them on top of the Tower.
114	8	"Welcome Back, Kara"	Armen V. Kevorkian	Dana Horgan & Jay Faerber	August 24, 2021 (2021-08-24)	T13.22608	0.56
The team celebrates Kara's return, but Kara suffers repeated flashbacks from her traumatic experience. Zor-El joins Kara and Nia at CatCo, posing as Kara's uncle Archie. Kara visits William, who is now seeing someone else. As CatCo's ratings plummet, Andrea overworks Kara and William and snoops for information as Acrata in attempts to trash Lex and reclaim CatCo's spot, but later realizes that there's nothing she can do and apologizes. Zor-El joins Supergirl in putting out a fire from a fallen satellite at a large collection of garbage in the ocean. The garbage prompts Zor-El to combat Earth's environmental crises out of guilt for failing Krypton, so he uses a Kelex named Oscar. It is programmed to convert garbage into energy, but it malfunctions and becomes a giant trash robot. Brainy and Zor-El create a virus to destroy it. Afterwards, Zor-El leaves to reunite with Alura on Argo City, Kara talks to Alex about her time in the Phantom Zone, and Lena calls Nia saying that she interpreted her Fear Vision of the Kelpie and leaves to visit her birthplace. In the middle of the night, Nia awakens, saying Nyxly's name.
115	9	"Dream Weaver"	Shannon Kohli	Karen E. Maser & Emilio Ortega Aldrich	August 31, 2021 (2021-08-31)	T13.22609	0.59
In a dream, Nia unsuccessfully tries to reach her late mother. Nyxly gets trapped in the dream and offers to bring Nia's mother to life for one day in exchange for her freedom, promising to return to the Fifth Dimension afterward. Kara, J'onn and Alex track explosives while Andrea continues urging Kara and William to get human interest stories about the Superfriends. Kelly is assigned to help an alien superpowered boy named Joey. His brother Orlando is in prison, and Kelly and Kara soon learn that his work release plan has been corrupted to use him and other superpowered aliens to steal parts for a dirty bomb. William and Kara identify the warden as the plotter, in league with Intergang boss Bruno Mannheim. Supergirl convinces Orlando and the other aliens to surrender. Andrea is pleased with William's live interview with Supergirl, defending the now-reformed work release program and Kelly covertly exposes the abusive nature of Joey's foster home. With Alex and James Olsen's support, Kelly plans to take on the role of Guardian.
116	10	"Still I Rise"	Jesse Warn	Story by: Jess Kardos Teleplay by: Nicki Holcomb & Jen Troy	September 7, 2021 (2021-09-07)	T13.22610	0.48
Nyxly puts Nia into isolation for the day, where her mother chastises her for releasing Nyxly, but helps her understand and overcome her fear. Nyxly, left powerless, is captured by Naxim Tork's former partner Mitch, but he releases her and plans to impress Tork by capturing Supergirl. Mitch first finds an Edifarian engineering expert, Dr. Desmond Raab, to build a cryo-bomb capable of freezing everything within a mile and uses it on the Ormfell Building, a housing project to which Orlando would be able to bring Joey. J'onn stabilizes the building and Supergirl destroys the bomb with her heat vision, but this inadvertently recharges Nyxly's powers. Supergirl tries to persuade the city to not let Councilwoman Rankin turn the Ormfell Building into a tech complex, and succeeds by letting Orlando tell his story to the city council. As the Superfriends rescue citizens, Nyxly freezes Supergirl and begins destroying the building. As Nyxly gloats that Supergirl is powerless against magic, Supergirl summons Mxyzptlk.
117	11	"Mxy in the Middle"	Glen Winter	Story by: Rob Wright Teleplay by: Elle Lipson & Chandler Smidt	September 14, 2021 (2021-09-14)	T13.22611	0.40
Mxy and Supergirl escape to the Tower, where Mxy musically explains that Nyxly plans to gain unlimited power by assembling seven magical stones, which she'll use to exact revenge against her father, King Brpxz. Nyxly intends to imprison Mxy in a crystal, and she will find him immediately if he uses any magic. She terrorizes the city with a giant cat and a deadly Hell Dragon. Mxy surrenders to Nyxly, who enlists Mitch's help. Meanwhile, Lena arrives in Newfoundland and visits the hometown of her mother, Elizabeth Walsh, guided by a photo of her friends Margaret Bishop and Florence Abbott. Elizabeth is remembered as an evil witch and is blamed for the death of Margaret and her abusive husband by their daughter Peggy. With Andrea's help, Lena finds Abbott who reveals that their coven accidentally killed Bishop's abusive husband. Florence tells Lena that she also has magical abilities.
118	12	"Blind Spots"	David Ramsey	J. Holtham & Azie Tesfai	September 21, 2021 (2021-09-21)	T13.22612	0.48
Earlier, Kelly sees the destruction of the Ormfell building and helps Orlando pull Joey out of the rubble. The overwhelmed hospital workers pay little attention to them, even though they are glowing strangely. Councilwoman Rankin, also glowing, intimidates a doctor into giving her an experimental treatment, allowing her to recover immediately and gain the ability to materialize objects. As the Superfriends are preoccupied with finding Nyxly, Kelly and John Diggle work to identify Rankin's strange abilities. Kelly fights Rankin as Guardian and grabs a piece of her hair, allowing Brainy to learn how to stop her. He also improves the Guardian suit and tells Kelly that even the 31st century has inequality and oppression. Guardian uses Brainy's device to return Rankin's stolen 5th dimensional energy and she is arrested. Meanwhile, Lena begins studying magic in Newfoundland but rushes back to help her friends and finds a magic book from Florence.
119	13	"The Gauntlet"	Tawnia McKiernan	Story by: Dana Horgan Teleplay by: Jay Faerber & Brooke Pohl	September 28, 2021 (2021-09-28)	T13.22613	0.40
At the Fortress, Kara and Lena learn about the Totem of Courage from Vita, a simulation of an eccentric Kryptonian witch. When someone activates it with a magic word, they must revisit a time when they lacked courage, gaining its power when they succeed in this trial. Supergirl disrupts Nyxly's theft of the totem in the form of a slingshot that David used to slay Goliath and blasts it with her heat vision before Nyxly can escape, leaving Supergirl and Nyxly with half each. This event enhances the courage of everyone at the scene: a shy scientist is emboldened to harness lightning, Sentinel becomes reckless, J'onn is distracted by being able to express his feelings, and Brainy dares to make inaccurate predictions. Attempting the trial, Kara revisits her emergence as Supergirl, but fails, and Nyxly revisits her defeat by her father, finally succeeding by expressing her anger at her brother's betrayal. Kara's half of the totem tries to rejoin the other. Kara has Lena release it because she can only stop a catastrophic lightning storm with her team restored to their normal personalities. This works, but Nyxly now has the totem and looks for more. Vita suggests to Lena that a previously unknown Earth witch might be able to help.
120	14	"Magical Thinking"	Simon Burnett	Karen E. Maser & Derek Simon	October 5, 2021 (2021-10-05)	T13.22614	0.42
William asks to be embedded with the Superfriends, agreeing to keep some operational details secret. Nyxly finds and takes the Totem of Humanity (a Bodhi charm) and activates it, causing everyone in range to join a brawling mob. Lena first fails to use her mother's spell, but William helps her with a cooking analogy. The spell works, but makes the area of violence larger. Supergirl convinces her do this again, knowing through her psychic bond that Nyxly is overwhelmed by feelings of compassion. Unable to kill a guard to obtain the Totem of Hope, Nyxly abandons the Totem of Humanity, ending the violence. Supergirl recovers it, but Nyxly starts off after the others while planning to reclaim the Totem of Humanity at a later date. Meanwhile, Kelly checks on the new foster parents of Esme, the girl from Joey's former group home. They seem nice. When they are trapped by the mob, they discover that Esme can breathe fire when faced with an Infernian attacker. They put Esme outside to protect themselves from the mob, before Guardian and Sentinel rescue her. They decide to become Esme's own foster parents and learn about her kind's true powers.
121	15	"Hope for Tomorrow"	Tawnia McKiernan	Story by: Robert Rovner Teleplay by: Emilio Ortega Aldrich & Nicki Holcomb	October 12, 2021 (2021-10-12)	T13.22615	0.38
Esme's new life with Kelly and Alex is soon complicated by her Dryalian ability to acquire superpowers from anyone nearby. They let her experience their friends' powers, but overdo it to the point where she says she should go back. With the help of a Truth Seeker, they reassure Esme that they will never abandon her. Nyxly identifies the Totem of Hope, and find that in order to use it they must "inspire hope brighter than the sun". Thinking this a job for Supergirl, Nyxly plans to extort both the Hope and Humanity tokens by taking William hostage. Nyxly's activation of the totem exacerbates a dispute between Kaznia and another nation, leading to nuclear war. Supergirl disarms both nations, passing her test by inspiring hope, and with William's help rescues him and gets all three stones. She sends the Hope totem into the sun, so that Nyxly can never unite all seven totems. Nyxly receives a gift from a "secret admirer" which contains a special watch that forms a Lexosuit around her.
122	16	"Nightmare in National City"	Eric Dean Seaton	Rob Wright & Jess Kardos	October 19, 2021 (2021-10-19)	T13.22616	0.42
Following the advice of her suit's A.I., Nyxly heads into a laboratory so that she can access the Dream Realm and claim the Dream Totem. A Nightmare Monster is released, forcing the Super Friends to quarantine it in a forcefield dome with people trapped inside. Nia follows her dream vision to a university and the office of Dr. M. Revée, who is actually her sister Maeve. They work together to get into the Dream Realm, but Maeve tries to steal the Dream Totem and the oracle deems her unworthy. Nyxly steals it. Meanwhile, Kara resolves to end tensions between Kaznia and Corto Maltese, but misses interviews with a Kaznian negotiator and the nation leaders due to hostility in the dome and the monster. She hands the interviews to William and quits, and publicly apologizes as Supergirl. Though Nia considers Maeve's acts unforgivable, she does give her a second chance. Elsewhere, Nyxly places the Dream Totem in the gauntlet, causing Lex to appear.
123	17	"I Believe in a Thing Called Love"	Jesse Warn	Dana Horgan & Nicki Holcomb	October 26, 2021 (2021-10-26)	T13.22617	0.45
Lex reveals to Nyxly that he travelled to the future, where they fell in love but that she died after achieving her revenge. The Superfriends bait Nyxly using a fake Love Totem and Lex rescues her. Nyxly rebuffs him, so he captures Mitch and uses him in a plan to attract her. J'onn unlocks the Courage Totem, revisiting the time he failed to protect his daughters. Nyxly finds the Love Totem, but it disappears during a fight with the Superfriends and asks for Lex's help. It reappears when Alex and Kelly propose to one another, but is destroyed in another fight against Lex and Nyxly. With Lena's help, Kara uses the Humanity Totem against Nyxly, but Lex rescues her and retreats. Afterwards, the Superfriends celebrate Alex's and Kelly's engagement and Brainy contacts the Legion of Superheroes. Meanwhile, Andrea plots to expose Lex's partnership and as Acrata, steals a journal from Lex. William secretly meets with Otis Graves. Lex gives Nyxly a recreated Hope Totem as a new Love Totem appears as a tattoo on Esme's neck.
124	18	"Truth or Consequences"	David McWhirter	Story by: Karen E. Maser Teleplay by: Emilio Ortega Aldrich & Elle Lipson	November 2, 2021 (2021-11-02)	T13.22618	0.40
The Superfriends locate Mitch's ship in cislunar space. J'onn and Supergirl defeat Nyxly and Lex, who activate the ship's self-destruct and flee through a portal (saving Mitch at the last minute). Andrea leaks Lex's love for Nyxly while using William's name. Supergirl obtains the new Hope Totem at the last minute. All seems well, and Kelly and Alex host their bachelorette party, leaving William to mind Esme at the Tower. There Brainy reveals his message from the 31st century, that he can only save the Coluan people by returning there and end his individual existence. Nyxly locates the Love Totem, Lex disarms the Tower's defenses, and they take Esme, with Lex shooting William dead on his way out. Before dying, William recorded the final moments and mailed it to Andrea which leaves her devastated. The rest of the Superfriends find William dead.
125	19	"The Last Gauntlet"	Glen Winter	Story by: J. Holtham Teleplay by: Derek Simon & Jay Faerber	November 9, 2021 (2021-11-09)	T13.22619	0.59
Lex offers to exchange Esme for the other totems. The Love Totem tattoo begins losing its petals, but Nyxly refuses to harm Esme despite Lex's warning that this is how she fails. Lillian attempts to break up Lex and Nyxly. Lena catches Acrata in the Tower, but reminds her that she can change for the better. Kara finds the Destiny Totem in Prague and sees Lex and Nyxly all-powerful, but Alex takes it and the other totems. Lex extracts the Love Totem, but this angers Nyxly and she takes the totem and returns Esme. Brainy and J'onn hijack a satellite to refocus the Sun's energy into Kara to make her invincible, but stop when humanity is harmed by the loss of sunlight. The Allstone is formed, but Esme shatters it and Nyxly, Lex, and the Superfriends fight for its fragments. Nyxly mortally wounds Lillian and she and Lex depower humans in order to keep fighting each other.
126	20	"Kara"	Jesse Warn	Story by: Robert Rovner & Jessica Queller Teleplay by: Rob Wright & Derek Simon	November 9, 2021 (2021-11-09)	T13.22620	0.49
Lillian tells Lena to fully own her power and dies from her injuries. Kara reassures the people of humanity and they reclaim their power, weakening Lex and Nyxly. The Superfriends, joined by Acrata, Orlando, Mitch, Eliza Danvers, Mon-El, Winn Schott, and Jimmy Olsen, fight Lex, Nyxly, and manifestations of Overgirl, Red Tornado, Metallo, Parasite, the Hell Dragon, and the Nightmare Monster. Lex opens a portal to the Phantom Zone. Since they feed on fear and their supposed victims stand strong, the Phantoms drag Lex and Nyxly in. Days later, the Superfriends attend William's funeral and reform the DEO. Mon-El tells Kara that he will no longer be able to return to the past to see her, due to his responsibility with The Legion. Three weeks later, Cat Grant buys back CatCo from Andrea and offers Kara a job as her editor-in-chief. Alex and Kelly get married, and Brainy decides to stay in the present with Nia. Winn reveals that J'onn and M'gann have a son in the future. Cat ("please, those spectacles disguised you as much as a pair of Groucho Marx glasses...") and Lena convince Kara to accept the job and end her double life by revealing her identity as Supergirl to the world so she can live a more full life as one person.

References

General references