Supergirl Season 3 Episode 20
Dark Side of the Moon
Supergirl is stunned to discover that a part of Krypton survived. Meanwhile, Alex is attacked while out with Ruby, and Lena considers how far she will go to keep Reign contained.
Guest Stars
David Chisum
Ron Collins
Tim Russ
Jul-Us
Emma Tremblay
Ruby Arias
Erica Durance
Alura Zor-El
Anjali Jay
Selena