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


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.[1]




  • This is the first episode of the series not to feature James Olsen.
  • As of this episode, Melissa Benoist and Jeremy Jordan are the only cast members to appear in every episode of the series.
  • This episode pays homage to the Smallville sixth season episode "Combat" Whereas Clark is introduced to an underground revolving fight club, in order to put a stop to an alien from the Phantom Zone of which murders the losers.