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Go BackSupergirl

Supergirl Season 4

The CW Rent or Buy
Here's where to watch every episode of Supergirl season 4. Mouseover or tap an episode to see where to stream it. Click or tap the play icon to stream it on the best available service.
Season 04, Episode 01 American Alien

S04 E01

Oct 15, 2018
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American Alien Oct 15, 2018 Diving back into reporting, Kara welcomes a new cub reporter to CatCo. Meanwhile, James and Lena argue about James’ impending indictment for acting as the vigilante Guardian, while Alex and Brainy struggle to get in sync at the DEO. 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.

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Season 04, Episode 02 Fallout

S04 E02

Oct 22, 2018
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Fallout Oct 22, 2018 A shocking revelation causes chaos in National City. Supergirl sets out to capture Mercy Graves, while Alex takes control at the DEO. Back at CatCo, Kara decides to write an investigative story on Mercy and asks Lena if she can interview her as Mercy has ties to the Luthors. Meanwhile, Brainy meets Nia and the two end up in a precarious situation.

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Season 04, Episode 03 Man of Steel

S04 E03

Oct 29, 2018
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Man of Steel Oct 29, 2018 Ben Lockwood didn't always hate aliens. Through a series of incidents, and input from his anti-alien father, Ben slowly transforms from a mild-mannered professor into the villainous Agent Liberty of today.

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Season 04, Episode 04 Ahimsa

S04 E04

Nov 5, 2018
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Ahimsa Nov 5, 2018 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, he realizes there are a lot of ways to help his fellow aliens during this tumultuous time.

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Season 04, Episode 05 Parasite Lost

S04 E05

Nov 12, 2018
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Parasite Lost Nov 12, 2018 Colonel Haley makes a surprising decision regarding Supergirl. 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 article puts some of the aliens in harm’s way.

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Season 04, Episode 06 Call to Action

S04 E06

Nov 19, 2018
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Call to Action Nov 19, 2018 Everyone gathers for Thanksgiving but 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.

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Season 04, Episode 07 Rather the Fallen Angel

S04 E07

Nov 26, 2018
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Rather the Fallen Angel Nov 26, 2018 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. Lena kicks off her first set of trials.

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Season 04, Episode 08 Bunker Hill

S04 E08

Dec 3, 2018
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Bunker Hill Dec 3, 2018 Nia has a powerful dream about Agent Liberty but refuses to look at it as a prophetic dream and pushes it aside. After noticing something is bothering Nia, Kara enlists Brainy's help, and the two try to persuade Nia to embrace her destiny. Meanwhile, Manchester Black pays Ben Lockwood a menacing visit.

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Season 04, Episode 09 Elseworlds (III)

S04 E09

Dec 12, 2018
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Elseworlds (III) Dec 12, 2018 Supergirl, The Flash, Green Arrow and Superman engage in the battle of their lives.The crossover starts on The Flash S05E09 Elseworlds (I) and Arrow S07E09 Elseworlds (II).

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Season 04, Episode 10 Suspicious Minds

S04 E10

Jan 21, 2019
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Suspicious Minds Jan 21, 2019 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.

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Season 04, Episode 11 Blood Memory

S04 E11

Jan 28, 2019
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Blood Memory Jan 28, 2019 Kara joins Nia on a trip to Nia's hometown to visit her family during the town's annual Harvest Festival. While home, Nia's mother encourages her daughter to embrace her destiny. Meanwhile, Alex deals with a street drug that is turning people violent and giving them temporary superpowers.

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Season 04, Episode 12 Menagerie

S04 E12

Feb 18, 2019
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Menagerie Feb 18, 2019 With his P.I. shingle newly hung outside his office, J'onn welcomes new clients. Trying to take her mind off what happened at the DEO, Kara decides to team up with J'onn on his latest assignment, which unfortunately ends up tying directly into Alex's current investigation that involves the villain Menagerie. Meanwhile, Lena shares some news with James, but his reaction isn't what she expected. Nia invites Brainy to her Valentine's Day party.

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Season 04, Episode 13 What's So Funny About Truth, Justice, and the American Way?

S04 E13

Mar 4, 2019
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What's So Funny About Truth, Justice, and the American Way? Mar 4, 2019 Manchester Black breaks out of prison with the help of his new team, The Elite, who are set on punishing the anti-alien forces. Supergirl pulls double duty as she tries to apprehend Manchester Black and his team as well as deal with a shocking new development with Ben Lockwood.

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Season 04, Episode 14 Stand and Deliver

S04 E14

Mar 11, 2019
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Stand and Deliver Mar 11, 2019 Between Ben Lockwood’s new push to stir up the anti-alien movement and the Elite’s desire to target Lockwood and his minions, Supergirl is concerned about the safety of the American people – both human and alien. 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. Meanwhile, James picks up his camera again to cover the march for CatCo, and Hayley assigns Alex a job that clashes with her beliefs. When The Elite and Ben Lockwood stir up trouble at the rally, Supergirl is forced to take a stand.

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Season 04, Episode 15 O Brother, Where Art Thou?

S04 E15

Mar 18, 2019
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O Brother, Where Art Thou? Mar 18, 2019 Secretly furloughed from prison due to failing health, Lex Luthor visits his sister, Lena, to seek her help finding a cure. Savvy as ever, 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. Meanwhile, Supergirl and J'onn face off against Manchester Black. James' sister Kelly comes to town.

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Season 04, Episode 16 The House of L

S04 E16

Mar 25, 2019
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The House of L Mar 25, 2019 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.

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Season 04, Episode 17 All About Eve

S04 E17

Apr 1, 2019
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All About Eve Apr 1, 2019 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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Season 04, Episode 18 Crime and Punishment

S04 E18

Apr 22, 2019
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Crime and Punishment Apr 22, 2019 Kara and Lena head to Stryker's Island to search for clues on how to defeat Lex. At the prison, Kara tries to befriend a nosy prisoner, Steve, who may have insight into what Lex was doing, while Lena studies an array of puzzles Lex left behind in the hopes of discovering his whereabouts. While there, a prison riot breaks out and Kara must find a way to stop the prisoners without revealing her secret identity as Supergirl. Meanwhile, Kelly encourages James to talk to someone for his PTSD, and Alex faces off against Ben Lockwood after he storms the DEO and acquires some powerful weapons to hunt Supergirl.

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Season 04, Episode 19 American Dreamer

S04 E19

Apr 29, 2019
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American Dreamer Apr 29, 2019 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.

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Season 04, Episode 20 Will The Real Miss Tessmacher Please Stand Up?

S04 E20

May 6, 2019
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Will The Real Miss Tessmacher Please Stand Up? May 6, 2019 Kara and Lena head to Kaznia to hunt down Lex. However, Eve Tessmacher 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.

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