Supergirl was renewed for a third season by The CW on January 8, 2017.[2] It premiered on October 9, 2017.


Main cast

Special appearance by

Special guest cast

Recurring cast


Thirteen-year-old Kara escaped the doomed planet Krypton with her parents' help at the same time as the infant Kal-El. Protected and raised on Earth by her foster family, the Danvers, Kara grew up in the shadow of her foster sister, Alex, and learned to conceal the phenomenal powers she shares with her famous cousin in order to keep her identity a secret. Years later, Kara was living in National City and still concealing her powers, when a plane crash threatened Alex's life and Kara took to the sky to save her. Now, Kara balances her work as a reporter for CatCo Worldwide Media with her work for the Department of Extra-Normal Operations (D.E.O.), a super-secret government organization whose mission is to keep National City and the Earth safe from sinister threats. At the D.E.O., Kara works for J'onn J'onzz, the Martian Manhunter, and alongside her foster sister, Alex, and best friend, Winn Schott. Also in Kara's life are media mogul Cat Grant, James Olsen, a photo journalist who moonlights as Guardian, a masked vigilante, Lena Luthor, and Mon-El of Daxam, whose planet was ravaged by Krypton's destruction. As Kara struggles to navigate her relationships and her burgeoning life as a reporter, her heart soars as she takes to the skies as Supergirl to fight crime.[6]

Confirmed plot points

Confirmed new characters

  • Querl Dox/Brainiac 5: Half computer, half organic life and boasting a 12-level intellect, Brainiac 5 is a member of the Legion of Super-Heroes who travels to National City from the 31st Century to help Supergirl and the DEO battle Reign.[9]
  • Tormock: A warrior of Amazonian stature, jacked, tough and brutal, she is a fierce alien prisoner. Dangerous and angry, she gets into a violent fight.[10]
  • Julia Freeman: A 20-something musician living near National City who holds clues to Reign’s true identity.[5]


# Episode name Directed by Story by Teleplay by Original airdate
1 "Girl of Steel" Jesse Warn Andrew Kreisberg Robert Rovner & Caitlin Parrish October 9, 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 Luthor makes a bold move.
2 "Triggers" David McWhirter Gabriel Llanas & Anna Musky-Goldwyn October 16, 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 Olsen and Lena Luthor are at an impasse, and Samantha starts her new job at L-Corp.
3 "Far From the Tree" Dermott Downs Jessica Queller & Derek Simon October 23, 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.
4 "The Faithful" Jesse Warn Paula Yoo & Katie Rose Rogers October 30, 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.
5 "Damage" Kevin Smith Eric Carrasco & Cindy Lichtman November 6, 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.
6 "Midvale" Rob Greenlea Caitlin Parrish & Jess Kardos November 13, 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 Danvers sisters closer together.
7 "Wake Up" Chad Lowe Gabriel Llanas & Anna Musky-Goldwyn November 20, 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.
8 "Crisis on Earth-X, Part 1" Larry Teng Andrew Kreisberg & Marc Guggenheim Robert Rovner & Jessica Queller November 27, 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.
9 "Reign" Glen Winter Paula Yoo & Caitlin Parrish December 4, 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.
10 "Legion of Super-Heroes"[11] TBA TBA January 15, 2018[12]
11 "Fort Rozz"[13] TBA TBA January 22, 2018[1]
12 "For Good"[14] TBA TBA January 29, 2018[1]
13 TBA TBA TBA February 5, 2018[1]
14 TBA TBA TBA April 16, 2018[1]
15 TBA TBA TBA April 23, 2018[1]
16 TBA TBA TBA April 30, 2018[1]
17 TBA TBA TBA May 7, 2018[1]
18 TBA TBA TBA May 14, 2018[1]
19 TBA TBA TBA May 21, 2018[1]
20 TBA TBA TBA May 28, 2018[1]
21 TBA TBA TBA June 4, 2018[1]
22 TBA TBA TBA June 11, 2018[1]


Promotional images