Watch Supergirl Online: Season 3 Episode 20

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Who survived the destruction of Krypton?

That was addressed on Supergirl Season 3 Episode 20 when the superhero learned there was a possibility that her biological mother survived and she set out to find out the truth. 

Meanwhile, Alex was attacked while out with Ruby and had to make an on the spot decision about her future. 

Also, Sam came up with a creative way to keep Reign contained but was it sustainable?

Use the video above to watch Supergirl online right here via TV Fanatic. 

Get caught up with the latest from the characters right now. 

Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.

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Supergirl Season 3 Episode 20 Quotes

Winn: You seem more stoic and grave than usual, which if we're being honest is making me a little bit queasy. What haven't you told me?
J'onn: Reign is becoming immune to Miss Luthor's synthetic Kyrptonite faster than we expected.

Supergirl and I may not see eye to eye, but there is one thing we can agree on, and that's that you need to be stopped. So enjoy your moment in the sun, Reign, because we are going to save Sam, and end you.