Episode 1
Aired Oct 14, 2018
American Alien
Kara welcomes a new cub reporter to CatCo; James and Lena argue about James' impending indictment for acting as the vigilante Guardian; Alex and Brainy struggle to get in sync at the DEO.
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Episode 2
Aired Oct 21, 2018
Fallout
A shocking revelation causes chaos in National City; Supergirl sets out to capture Mercy Graves, while Alex takes control at the DEO; Kara decides to write an investigative story on Mercy and looks to Lena for information; Brainy meets Nia.
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Episode 3
Aired Oct 28, 2018
Man of Steel
Through a series of incidents, and input from his anti-alien father, Ben Lockwood slowly transforms from a mild-mannered professor into the villainous Agent Liberty.
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Episode 4
Aired Nov 4, 2018
Ahimsa
When Supergirl needs help, Alex asks Lena and Brainiac to team up; J'onn questions his decision to quit the DEO, but after running into Manchester Black, he realizes there are a lot of ways to help his fellow aliens.
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Episode 5
Aired Nov 11, 2018
Parasite Lost
Col. Haley makes a surprising decision regarding Supergirl; Kara writes a series of articles highlighting aliens in National City in the hope of making humans less fearful of them; unfortunately, the article puts some of the aliens in harm's way.
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Episode 6
Aired Nov 18, 2018
Call to Action
As everyone gathers for Thanksgiving, Kara is feeling down after her televised debate with Ben Lockwood; James and Lena argue about the best way to handle the Children of Liberty.
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Episode 7
Aired Nov 25, 2018
Rather the Fallen Angel
James falls in deeper with the Children of Liberty in his efforts to meet Agent Liberty; Supergirl and Manchester Black follow a lead on Agent Liberty's location, but things take a dark turn; Lena kicks off her first set of trials.
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Episode 8
Aired Dec 2, 2018
Bunker Hill
Nia has a powerful dream about Agent Liberty but refuses to look at it as a prophetic dream; Kara and Brainy try to persuade Nia to embrace her destiny; Manchester Black pays Ben Lockwood a menacing visit.
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Episode 9
Aired Dec 11, 2018
Elseworlds
Supergirl, The Flash, Green Arrow and Superman engage in the battle of their lives.
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Episode 10
Aired Jan 20, 2019
Suspicious Minds
When Supergirl angers Col. Haley by refusing to be told what to do, Haley refocuses her energy on learning Supergirl's true identity; Brainiac-5 encourages Nia to embrace her powers.
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Episode 11
Aired Jan 27, 2019
Blood Memory
Kara joins Nia on a trip to Nia's hometown to visit her family during the town's annual Harvest Festival; Alex deals with a street drug that is turning people violent and giving them temporary superpowers.
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Episode 12
Aired Feb 17, 2019
Menagerie
J'onn welcomes clients to his new office; Kara teams up with J'onn on an assignment, which unfortunately ends up tying directly into Alex's current investigation involving the villain Menagerie; Nia invites Brainy to her Valentine's Day party.
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Episode 13
Aired Mar 3, 2019
What's So Funny About Truth, Justice, and the American Way?
Manchester Black breaks out of prison with the help of his new team, the Elite; Supergirl tries to apprehend Black and his team while dealing with a shocking new development involving Ben Lockwood.
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Episode 14
Aired Mar 10, 2019
Stand and Deliver
When Lockwood organizes a rally, the aliens decide to peacefully protest; Brainiac and J'onn join the alien march, while Supergirl and Dreamer patrol to keep everyone safe; Hayley assigns Alex a job that clashes with her beliefs.
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Episode 15
Aired Mar 17, 2019
O Brother, Where Art Thou?
Secretly furloughed from prison due to failing health, Lex Luthor visits his sister to seek her help; Lena is suspicious of Lex's motives, but when she's faced with a life and death situation, she must decide how she truly feels about her brother.
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Episode 16
Aired Mar 24, 2019
The House of L
In the wake of Lex Luthor's return, flashbacks show what he's been doing for the last two years and how his secret machinations and plans have affected Supergirl and Lena.
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Episode 17
Aired Mar 31, 2019
All About Eve
Supergirl must deal with the destructive aftermath of Lex's nefarious plans; shocked at what Lex has created, Supergirl faces her biggest challenge yet.
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Episode 18
Aired Apr 21, 2019
Crime and Punishment
Kara and Lena head to Stryker's Island to search for clues on how to defeat Lex; Kara tries to befriend a prisoner who may have insight into what Lex was doing; Kelly encourages James to talk to someone about his PTSD.
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Episode 19
Aired Apr 28, 2019
American Dreamer
Kara doggedly works as a reporter to clear Supergirl's name; Dreamer picks up the slack as National City's protector, which leads to a showdown with Ben Lockwood; James takes drastic measures to relieve his PTSD.
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Episode 20
Aired May 5, 2019
Will the Real Miss Tessmacher Please Stand Up?
Kara and Lena head to Kaznia to hunt down Lex; Eve Tessmacher sets a trap that could ultimately reveal that Kara is Supergirl; Alex gets a long-awaited phone call; James practices using his powers; Ben Lockwood takes a dangerous stand inside the DEO.
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Episode 21
Aired May 12, 2019
Red Dawn
Kara comes face to face with Red Daughter and the two engage in an epic battle; Lena turns to an unlikely source for help; Alex realizes she's missing parts of her memory; Brainy, Nia and J'onn set out to track down aliens who have been abducted.
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Episode 22
Aired May 19, 2019
The Quest for Peace
Lex Luthor descends upon Washington, D.C., and summons Lena and Lillian Luthor to the White House; when Supergirl realizes she has one last chance to stop Lex, she turns to the power of the press to help.
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