Survivors

"Survivors" is the fourth episode of the second season of Supergirl. It will air on October 31, 2016.

Synopsis
When Kara and Alex investigate the murder of an unregistered alien, the trail leads to an alien fight club run by Roulette, the ringmaster who commands aliens to fight in mortal combat for the entertainment of rich humans. While trying to stop the fighting, Supergirl and Martian Manhunter find themselves up against a surprising opponent. Meanwhile, J'onn is thrilled to have found another Martian and tries to get to know M'gann better. Supergirl takes Mon-El under her wing and begins to train him.

Starring

 * Melissa Benoist as Kara Danvers/Supergirl
 * Chyler Leigh as Alex Danvers
 * Jeremy Jordan as Winn Schott
 * Chris Wood as Mon-El
 * Floriana Lima as Maggie Sawyer
 * David Harewood as J'onn J'onzz/Martian Manhunter

Special Guest Star

 * Laura Benanti as Alura Zor-El

Guest Starring

 * Sharon Leal as M'gann M'orzz/Miss Martian
 * Katie McGrath as Lena Luthor
 * Dichen Lachman as Veronica Sinclair/Roulette
 * Ian Casselberry as Quill
 * Ian Gomez as Snapper Carr

Co-Stars

 * Stephi Chin-Salvo as Receptionist
 * John DeSantis as Draaga
 * Harrison MacDonald as Mummy Bro
 * Dan Willows as Werewolf Bro
 * Terry Mullett as Buzzcut Merc
 * Ben Sullivan as Prince of Daxam
 * Shauna Haracka as Maggie's Girlfriend
 * Robert Zen Humpage as Dead Alien