Supergirl Episode 3: Fight or Flight

A new episode of Supergirl, titled "Fight or Flight" airs tonight on CBS.

Supergirl's powers are tested when Reactron (played by Chris Browning), one of Superman's formidable enemies, arrives in National City and targets the young hero. Also, Cat plans to run an exposé on Supergirl.

Check out a sneak preview as well as clips from tonight's episode in the videos below.

Dermott Downs directed the episode which was written by Michael Grassi and Rachel Shukert.

You can also see preview images in the gallery at the bottom of the page.

"Fight or Flight" episode of Supergirl airs tonight at 8:00-9:00 PM, ET/PT on CBS.