Supergirl: Sneak Peek and Synopsis For Epi 20 Season Finale (April 18)

CBS

Here's a preview and description of the Supergirl season finale (episode 20) "Better Angels".

"Supergirl is forced to do battle with an unexpected foe and must risk everything - including her life - to prevent Non and Indigo from destroying every person on the planet." - CBS

Her biggest battle yet is about to begin. 💪💥👊 Watch #Supergirl​'s season finale April 18th! https://t.co/3TUAcEjznVhttps://t.co/Jooxp0lLsD

— Supergirl (@supergirlcbs) April 13, 2016