|Challenge of the Superfriends|
|Season 7, Episode 8|
PART 1: BELOW- Kara Danvers traps herself and Reign in the tunnel network beneath Metropolis, with the rest of the League pitching in to help defeat the Worldkiller. Alex Danvers and Lena Luthor work to distract Reign while Kara recovers.
- Melissa Benoist as Kara Danvers/Supergirl
- Chyler Leigh as Alex Danvers
- Katie McGrath as Lena Luthor
- Odette Annable as Reign
- Tyler Hoechlin as Clark Kent/Superman
- Olivia Wilde as Susannah Russo (credit only)
- Jenna Dewan as Lucy Lane (credit only)
- Minka Kelly as Dawn Granger (credit only)
- Claire Holt as Karen Starr/Power Girl
- Michael Rosenbaum as LX-52 (credit only)
- with Emmy Rossum as Zaora Dru-Zod
- with David Harewood as J'onn J'onzz/Martian Manhunter
- and Mehcad Brooks as James Olsen/Guardian
Special Guest StarsEdit
- Katie Cassidy Rodgers as Laurel Lance/Black Canary
- Luke Evans as Bruce Wayne/Batman
- with Amber Heard as Mera
- and Jason Momoa as Arthur Curry/Aquaman
- Antagonist: Reign
- Title Meaning: A reference to the Hanna-Barbara cartoon of the 1960s.
- Sam, Susannah, Lucy, Dawn, and LX-52 do not appear in this episode.
- This is the final episode of the series to not feature Susannah.
- This episode will be akin to a horror film, with Kara as the Final Girl and Reign as the monster/villain.
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