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Go BackSupergirl

Supergirl Season 3

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Here's where to watch every episode of Supergirl season 3. 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 03, Episode 01 Girl of Steel

S03 E01

Oct 10, 2017
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Girl of Steel Oct 10, 2017 Kara deals with the loss of Mon-El by focusing all her energy on being Supergirl and the mysterious new threat against National City. Alex confesses a secret to Maggie about their impending nuptials. A citizen of National City has a mysterious connection to Kara, and Lena makes a bold move.

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Season 03, Episode 02 Triggers

S03 E02

Oct 17, 2017
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Triggers Oct 17, 2017 Psi, a thief with psychic powers, attacks National City. Able to immobilize people by tapping into their worst fears, Psi proves a formidable opponent for Supergirl. Meanwhile, James and Lena are at an impasse, and Samantha starts her new job at L-Corp.

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Season 03, Episode 03 Far From the Tree

S03 E03

Oct 24, 2017
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Far From the Tree Oct 24, 2017 Eliza throws Alex and Maggie a wedding shower, which causes Maggie to reach out to her estranged father. Supergirl joins J’onn on a personal mission.

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Season 03, Episode 04 The Faithful

S03 E04

Oct 31, 2017
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The Faithful Oct 31, 2017 Kara investigates a secretive new group whose leader, Thomas Coville, has a mysterious connection to Supergirl. Meanwhile, Samantha feels like she's letting Ruby down, and J'onn confesses an old secret.

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Season 03, Episode 05 Damage

S03 E05

Nov 7, 2017
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Damage Nov 7, 2017 When multiple children get sick from lead poisoning, Morgan Edge points the finger at Lena and blames her creation of the lead bomb she made to save National City from the Daxamites. While Lena knows she never intended any harm, she fears there may have been a flaw in her design, leaving her responsible. Kara teams up with Samantha to clear Lena’s name, but it turns out to be harder than they thought. Meanwhile, Alex and Maggie make a crucial decision about the future of their relationship.

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Season 03, Episode 06 Midvale

S03 E06

Nov 14, 2017
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Midvale Nov 14, 2017 Kara and Alex head home to Midvale for a little R&R. While there, Kara recalls a painful memory of a childhood friend's death and how that traumatic experience brought the Danver sisters closer together.

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Season 03, Episode 07 Wake Up

S03 E07

Nov 21, 2017
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Wake Up Nov 21, 2017 When Winn and the team discover an alien ship has crash landed deep underwater beneath National City, Kara/Supergirl is called in to investigate. Meanwhile, Hank attempts to bond with his father, Myr'nn. Samantha, eager for some understanding of the changes she has been experiencing, looks to her estranged mother, Patricia Arias, for answers.

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Season 03, Episode 08 Crisis on Earth-X (I)

S03 E08

Nov 28, 2017
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Crisis on Earth-X (I) Nov 28, 2017 Barry and Iris’s wedding brings the gang together, but things go awry when villains from Earth-X attack the ceremony. All of the superheroes band together with help from their super friends like Citizen Cold, The Ray, Felicity Smoak, Iris West and Alex Danvers to take on their most formidable villains yet. Earth’s mightiest heroes – Green Arrow, Supergirl, The Flash and White Canary – lead their teams into battle to save the world.The crossover continues on Arrow S06E08 Crisis on Earth-X (II), The Flash S04E08 Crisis on Earth-X (III) and DC's Legends of Tomorrow S03E08 Crisis on Earth-X (IV).

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Season 03, Episode 09 Reign

S03 E09

Dec 5, 2017
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Reign Dec 5, 2017 Supergirl investigates a mysterious symbol popping up all over National City, tracing its origins back to an ancient prophecy and the mark of the World Killer, Reign. Meanwhile, the tension between Lena and Morgan Edge continues to build, causing James to step in and offer up some protection, and possibly igniting a spark in the process.

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Season 03, Episode 10 Legion of Super-Heroes

S03 E10

Jan 16, 2018
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Legion of Super-Heroes Jan 16, 2018 Struggling to heal from her injuries inflicted by Reign, Supergirl remains in a dreamlike state, unable to be reached. Mon-El recruits one of the Legion members, Brainiac-5, to try to bring her back. Meanwhile, Reign continues her rampage on the city so the DEO teams up with the Legion of Superheroes to try to stop her.

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Season 03, Episode 11 Fort Rozz

S03 E11

Jan 23, 2018
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Fort Rozz Jan 23, 2018 As Reign continues to terrorize the city, Supergirl teams up with Saturn Girl, and the two recruit Supergirl’s former enemies, Livewire and Psi, to form a team for a mission to Fort Rozz to recover a prisoner who has information on how to defeat Reign once and for all. Meanwhile, Alex babysits Ruby.

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Season 03, Episode 12 For Good

S03 E12

Jan 30, 2018
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For Good Jan 30, 2018 Someone tries to kill Morgan Edge and he barely survives. He accuses Lena of being behind the attempt and vows to destroy her. When Lena fears her hatred for Morgan will take her to the Luthor dark side, Kara steps in to help her friend. Meanwhile, after Sam realizes she’s losing time, she confides in Alex who decides to run some medical tests to see if she can find out what’s going on with her new friend.

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Season 03, Episode 13 Both Sides Now

S03 E13

Feb 6, 2018
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Both Sides Now Feb 6, 2018 The DEO captures a second Worldkiller, Purity. Supergirl and Alex use very different methods of interrogation with Purity in the hopes of finding out how to defeat Reign. However, Purity escapes and attacks the city’s subway tunnels. Meanwhile, J’onn, Winn and Mon-El band together to fix the Legion ship.

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Season 03, Episode 14 Schott Through the Heart

S03 E14

Apr 17, 2018
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Schott Through the Heart Apr 17, 2018 When Winn’s father dies, his estranged mother, Mary, reappears trying to reconnect and to explain why she abandoned him all those years ago. Winn is too embittered from his rough childhood to forgive her but when a copycat Toyman attacks, the two must work together to stop him. Mon-El tells Kara something important about the Worldkillers, and Alex becomes suspicious of Myr'nn’s recent behavior.

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Season 03, Episode 15 In Search of Lost Time

S03 E15

Apr 24, 2018
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In Search of Lost Time Apr 24, 2018 Myr'nn inadvertently causes psychic disturbances at the DEO; Supergirl must work with J'onn to contain the chaos; Mon-El begins training Kara in fighting techniques he's learned in the future.

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Season 03, Episode 16 Of Two Minds

S03 E16

May 1, 2018
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Of Two Minds May 1, 2018 Supergirl and Imra have different ideas on how to stop the third Worldkiller, Pestilence. However, when both Alex and Winn are seriously injured by Pestilence, Supergirl and Imra team up to stop the destruction.

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Season 03, Episode 17 Trinity

S03 E17

May 8, 2018
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Trinity May 8, 2018 Still reeling after learning about Lena’s secret, Supergirl asks Guardian for a favor that could alter his relationship with Lena forever. Meanwhile, with all three Worldkillers united, Supergirl and the team brace for an epic battle.

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Season 03, Episode 18 Shelter From the Storm

S03 E18

May 15, 2018
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Shelter From the Storm May 15, 2018 When Reign starts hunting Ruby, Supergirl and Alex work together to keep her safe. Supergirl and J'onn look to Sam’s mother for advice on how to stop Reign and come away with some shocking news.

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Season 03, Episode 19 The Fanatical

S03 E19

May 22, 2018
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The Fanatical May 22, 2018 When Tanya, a disciple of Coville's, escapes from what's left of his cult, she gives Kara and James a journal that could hold the key to saving Sam. Someone learns Guardian's identity and threatens to expose James if he doesn't do what they ask. James contemplates what it means to be a black vigilante without a mask in America.

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Season 03, Episode 20 Dark Side of the Moon

S03 E20

May 29, 2018
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Dark Side of the Moon May 29, 2018 Supergirl is stunned to discover that a part of Krypton survived. Meanwhile, Alex is attacked while out with Ruby, and Lena considers how far she will go to keep Reign contained.

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Season 03, Episode 21 Not Kansas

S03 E21

Jun 5, 2018
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Not Kansas Jun 5, 2018 Kara makes a major life decision. Meanwhile, J'onn finds out that special DEO-caliber guns have hit the streets of National City.

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Season 03, Episode 22 Make It Reign

S03 E22

Jun 12, 2018
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Make It Reign Jun 12, 2018 Supergirl learns the true depth of Serena's nefarious plans for Earth. Supergirl, Mon-El and Alura must devise a plan to stop her before Serena gets to Earth. J'onn prepares to say goodbye to his father.

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Season 03, Episode 23 Battles Lost And Won

S03 E23

Jun 19, 2018
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Battles Lost And Won Jun 19, 2018 Supergirl and team take on Selena in an epic battle for Earth.

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