About Supergirl Season 2, Episode 11 : The Martian Chronicles

Armek, a White Martian, descends on National City intent on taking M'gann back to Mars to face her punishment as a traitor. Hank and Supergirl determine the best way to keep M'gann safe is to bring her to the DEO. However, when it is revealed that Armek shape-shifted into M'gann and is now loose in the building, the team realize he could be disguised as any one of them. Guest Stars: Terrell Tilford, Sharon Leal, Briana Venskus, Peter G. Prontzos, Robert Zen Humpage, Curtis Lum, Andrea Brooks,