‘Supergirl’ Season 2 Spoilers: Kara, Hank, Alex And Maggie Learn About Roulette’s Underground Alien Fight Club In Episode 4 Trailer [VIDEO]

Kara (Melissa Benoist), Hank (David Harewood), Alex (Chyler Leigh) and Maggie (Floriana Lima) find out that National City has its own underground alien fight club in Season 2, episode 4 of “Supergirl.”

According to the synopsis for the episode, entitled “Survivors,” Kara and Alex discovered the alien fight club while investigating the murder of an unregistered alien.