Following the reveal of one photo from "Supergirl's" upcoming season finale, CBS has released the entire set of pics from the "Better Angels" episode. The pics include the return of a number of the show's season one guest stars, including Maxwell Lord (Peter Facinelli) and Eliza Danvers (Helen Slater). You can check out the images as well as a synopsis for the episode, which airs on April 18, below.

"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, on the first season finale of SUPERGIRL, Monday, April 18 (8:00-9:00 PM, ET/PT) on the CBS Television Network.

"Supergirl" airs on CBS on Mondays at 8 PM ET.