CW | 8:00 pm

The first rule of an alien fight club is … well, if you know the first rule of a human one, you can guess. "Survivors" revolves around such a secret set-up for those from other worlds, and Kara and Alex (Melissa Benoist, Chyler Leigh) discover it while probing a murder. The sinister Roulette (guest star Dichen Lachman) runs the physically brutal operation. Hank (David Harewood) tries to forge a connection with M’Gann (guest star Sharon Leal).