American Alien
Series 4, Episode 1 Unrated
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Diving back into reporting, Kara welcomes new reporter Nia Nal to CatCo in the season four premiere. Meanwhile, James and Lena argue about his impending indictment for acting as the vigilante, Guardian, while Alex and Brainy struggle to get in sync at the DEO. Then, Supergirl is called into action when remnants of the anti-alien terrorist organization Cadmus try to assassinate pro-alien leaders, but their endgame turns out to be much more sinister than she expected. J’onn relishes his peaceful new life, but an outing with an old friend causes him concern.
Fallout
Series 4, Episode 2 Unrated
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A shocking revelation causes chaos in National City. While Alex takes control at the DEO, Supergirl sets out to capture Mercy Graves (recurring guest star RHONA MITRA). Back at CatCo, Kara decides to write an investigative story on Mercy and asks Lena to introduce her as she has ties to the Luthors. Meanwhile, Brainy meets Nia and the two end up in a precarious situation.
Man of Steel
Series 4, Episode 3 Unrated
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Ben Lockwood (SAM WITWER) didn’t always hate aliens. Through a series of incidents, and input from his anti-alien father (guest star XANDER BERKELEY), Ben slowly transforms from a mild-mannered professor into the villainous Agent Liberty to today.
Ahimsa
Series 4, Episode 4 Unrated
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When Supergirl needs help, Alex asks Lena and Brainiac to team up. Meanwhile, J’onn questions his decision to quit the DEO. However, after running into Manchester Black (guest star DAVID AYALA), he realizes there are a lot of ways to help his fellow aliens during this tumultuous time.
Parasite Lost
Series 4, Episode 5 Unrated
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Colonel Haley (new series regular APRIL PARKER JONES) makes a surprising decision regarding Supergirl. Meanwhile, Kara writes a series of articles highlighting aliens in National City in the hopes that humans will stop being so fearful of them. Unfortunately, the articles put some of the aliens in harm’s way.
Call to Action
Series 4, Episode 6 Unrated
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Although everyone gathers for Thanksgiving, Kara is feeling down after her televised debate with Ben Lockwood about the anti-alien sentiment coursing through National City. Meanwhile, James and Lena argue about the best way to handle the Children of Liberty.
Rather the Fallen Angel
Series 4, Episode 7 Unrated
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James falls in deeper with the Children of Liberty in his efforts to meet Agent Liberty. Meanwhile, Supergirl and Manchester Black follow a lead on Agent Liberty’s location, but things take a dark turn. And Lena kicks off her first set of trials. Chad Lowe directs.
Bunker Hill
Series 4, Episode 8 Unrated
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When Nia refuses to acknowledge her powerful dreams of Agent Liberty as prophetic, Kara enlists Brainy’s help to persuade her to embrace her destiny.
Elseworlds: Part 3
Series 4, Episode 9 Unrated
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In the final part of the three-part crossover, Supergirl, The Flash (guest star GRANT GUSTIN), Green Arrow (guest star STEPHEN AMELL) and Superman (recurring guest star TYLER HOECHLIN) engage in the battle of their lives.
Suspicious Minds
Series 4, Episode 10 Unrated
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Colonel Haley is upset after Supergirl responds to a distress call from a Navy ship that turned out to be a deadly alien attack. Colonel Haley reclaims the site as DEO territory and demands that Supergirl step aside. After Supergirl refuses to be told what to do, Haley refocuses her energy on finding out Supergirl’s true identity and begins to interrogate all DEO agents, including Alex. Meanwhile, Brainiac-5 tries to persuade Nia to embrace her superpowers but she misinterprets his motives.
Blood Memory
Series 4, Episode 11 Unrated
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Kara joins Nia on a trip to Nia’s hometown to visit her family, where Nia’s mother encourages her to embrace her destiny. And Alex deals with a dangerous street drug.
Menagerie
Series 4, Episode 12 Unrated
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When Kara teams up with J’onn on his latest assignment as a P.I., it unfortunately ends up tying directly into Alex’s current DEO investigation, involving the villain Menagerie.
What's So Funny About Truth, Justice, and the American Way?
Series 4, Episode 13 Unrated
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When Manchester Black breaks out of prison with the help of his new team, The Elite, Supergirl tries to apprehend them while dealing with Ben Lockwood.
Stand and Deliver
Series 4, Episode 14 Unrated
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When Ben Lockwood and The Elite stir up trouble at an anti-alien rally, Supergirl is forced to take a stand.
O Brother, Where Art Thou?
Series 4, Episode 15 Unrated
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Secretly furloughed from prison due to failing health, Lex Luthor (JON CRYER) visits his sister, Lena, to seek her help finding a cure, but Lena’s suspicious of his motives.
The House of L
Series 4, Episode 16 Unrated
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In the wake of Lex Luthor’s return, the show flashes back to what he’s been doing for the last two years and how his secret machinations and plans have affected Supergirl and Lena.
All About Eve
Series 4, Episode 17 Unrated
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Shocked at what Lex has created, Supergirl faces her biggest challenge yet as she deals with the destructive aftermath of his nefarious plans.
Crime and Punishment
Series 4, Episode 18 Unrated
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While Supergirl and Lena search for clues on how to defeat Lex, Alex faces off against Ben Lockwood after he storms the DEO to acquire some weapons to hunt Supergirl.
American Dreamer
Series 4, Episode 19 Unrated
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As 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. Series star David Harewood directs.
Will The Real Miss Tessmacher Please Stand Up?
Series 4, Episode 20 Unrated
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Kara and Lena head to Kaznia to hunt down Lex. However, Eve Tessmacher (recurring guest star ANDREA BROOKS) sets a trap for the duo that could ultimately reveal that Kara is Supergirl. Meanwhile, Alex gets a long-awaited phone call, James practices using his powers, and Ben Lockwood takes a dangerous stand inside the DEO.
Red Dawn
Series 4, Episode 21 Unrated
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Kara comes face to face with Red Daughter and the two engage in an epic battle. Determined to find a way to extract the Harun-El, Lena turns to an unlikely source for help – Lillian Luthor (guest star BRENDA STRONG). Meanwhile, Alex realizes she’s missing parts of her memory; And Brainy, Nia and J’onn set out to track down aliens who have been abducted by Lex.
The Quest for Peace
Series 4, Episode 22 Unrated
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In the fourth season finale, Lex Luthor descends upon Washington, D.C. and summons Lena and Lillian Luthor to the White House. Realizing that she’s got one last chance to stop Lex, Supergirl turns to the power of the press to help her.
Supergirl: Comic-Con 2018 Sizzle
Series 4, Episode 100 Unrated
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A thrilling glimpse at the Supergirl Season 4.
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