Supergirl (2015)

S03E13 Both Sides Now

The DEO apprehends another Worldkiller known as Purity. Supergirl and Alex take contrasting approaches to interrogate her, aiming to uncover a way to stop Reign. However, Purity manages to break free and launches an assault on the subway tunnels in the city. Meanwhile, J’onn, Winn, and Mon-El join forces to repair the Legion ship.