Watch Supergirl Season 3 Episode 20 - Dark Side of the Moon

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Supergirl Season 3 Episode 20
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.
First Aired: May 28, 2018 - 41 Minutes Runtime
Emma Tremblay, Anjali Jay
Season 3 Episode 20 - Video Clips & Extras