The Mary Sue has an exclusive sneak peak of Supergirl. Check out the image below then head on over (at the bottom) to check out the preview:
Do not adjust your television set: that is Wonder Woman. Supergirl’s valiant efforts to return to the past and save her family, friends, culture, species and world from destruction are messing with the safety of earth something fierce, and that means the Justice League has gotten involved. PS: Probably Wonder Woman won’t die.