"Rao defies you. I defy you, and I will bring you low."
Supergirl to Purity
"Both Sides Now" is the thirteenth episode of the third season of Supergirl, and the fifty-fifth episode overall. It aired on February 5, 2018.


The D.E.O. captures a second Worldkiller, Purity. Supergirl and Alex use very different methods of interrogation with Purity in the hopes of finding out how to defeat Reign. However, Purity escapes and attacks the city’s subway tunnels. Meanwhile, J'onn, Winn and Mon-El band together to fix the Legion ship.



  • Alex says, "Purity is down, Reign and Pestilence to go" before Julia identifies herself as Purity. At that time, Alex couldn't have known whether the woman they captured was Purity out of Purity and Pestilence.


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