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