Supergirl/Season Three

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Season Three
Season Premiere October 9, 2017
Season Finale June 18, 2018
Episode Count 23
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Season Two



This is the current season of Supergirl.
Content may change as new information and details become available.

Season Three of Supergirl premiered on October 9, 2017.


# # Title Written By Directed By Airdate Viewers 18-49 Rating Prod.
43 1 Girl of Steel Andrew Kreisberg Jesse Warn October 9, 2017 1.867M 0.5% T13.20651
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.
Teleplay by Robert Rovner and Caitlin Parrish
44 2 Triggers Gabriel Llanas &
Anna Musky-Goldwyn
David McWhirter October 16, 2017 1.755M 0.5% T13.20652
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.
45 3 Far from the Tree Jessica Queller &
Derek Simon
Dermott Downs October 23, 2017 1.762M 0.5% T13.20653
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.
46 4 The Faithful Paula Yoo &
Katie Rose Rogers
Jesse Warn October 30, 2017 1.823M 0.5% T13.20654
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.
47 5 Damage Eric Carrasco &
Cindy Lichtman
Kevin Smith November 6, 2017 1.87M 0.5% T13.20655
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.
48 6 Midvale Caitlin Parrish &
Jess Kardos
Rob Greenlea November 13, 2017 1.893M 0.5% T13.20656
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.
49 7 Wake Up Gabriel Llanas &
Anna Musky-Goldwyn
Chad Lowe November 20, 2017 1.922M 0.5% T13.20657
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.
50 8 Crisis on Earth-X (1)
part 1 of 4 part crossover with Arrow, The Flash & DC's Legends of Tomorrow
Andrew Kreisberg &
Marc Guggenheim
Larry Teng November 27, 2017 2.713M 0.9% T13.20658
Barry and Iris's wedding brings the gang together, but things go awry when villains from Earth-X, a parallel Earth where the Nazis won World War II and now dominate their world, 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.
Teleplay by Robert Rovner & Jessica Queller
51 9 Reign Paula Yoo &
Caitlin Parrish
Glen Winter December 4, 2017 1.81M 0.8% T13.20659
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.
52 10 Legion of Super-Heroes Derek Simon &
Eric Carrasco
Jesse Warn January 15, 2018 2.168M 0.6% T13.20660
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.
53 11 Fort Rozz Gabriel Llanas &
Anna Musky-Goldwyn
Gregory Smith January 22, 2018 2.065M 0.5% T13.20661
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.
54 12 For Good Robert Rovner Tawnia McKiernan January 29, 2018 2.114M 0.6% T13.20662
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.
Teleplay by Cindy Lichtman & Alix Sternberg
55 13 Both Sides Now Jessica Queller &
Paula Yoo
Jesse Warn February 5, 2018 2.119M 0.6% T13.20663
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.
56 14 Schott Through the Heart April 16, 2018 T13.20664
57 15 In Search of Lost Time April 23, 2018 T13.20665
58 16 Of Two Minds April 30, 2018 T13.20666
59 17 Trinity May 7, 2018 T13.20667
60 18 Shelter from the Storm May 14, 2018 T13.20668
61 19 TBA May 21, 2018 T13.20669
62 20 TBA May 28, 2018 T13.20670
63 21 TBA June 4, 2018 T13.20671
64 22 TBA June 11, 2018 T13.20672
65 23 TBA June 18, 2018 T13.20673

Supergirl Seasons
Season 1 | Season 2 | Season 3