Ian Casselberry

When Kara and Alex investigate the murder of an unregistered alien, the trail leads to an alien fight club run by Roulette (guest star Dichen Lachman), 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, Hank is thrilled to have found another Martian and tries to get to know M'Gann (guest star Sharon Leal) better. Supergirl takes Mon-El under her wing and begins to train him.

Rick and the group realize the only way to maintain the peace of Alexandria is to fight a new enemy. This time, though, our group might be outmatched.

Davis concocts a remedy for the blues; Annie makes a decision; Antoine becomes LaDonna's unexpected benefactor; Colson warns Albert to avoid trouble; Creighton is inspired by a classic novel.