What was Lena hiding from everyone?
That was revealed on Supergirl Season 3 Episode 17 when Supergirl decided it was time to get more intel on what her friend was hiding.
This meant she had to turn to a good friend who shared a connection with Lena, but was it too late to save her?
Meanwhile, all three Worldkillers united, and Supergirl had to prepare for one final battle with them.
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Get caught up with all the latest big battles for the characters on this hit CW drama.
Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.