Watch Supergirl Online: Season 3 Episode 17

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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. 

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

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.

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Supergirl Season 3 Episode 17 Quotes

Brainy: Once I induce transmission, your minds will be immediately beamed into this dark valley.
Alex: Is it gonna hurt?
Brainy: The chances are better than 50%.
Alex: That's comforting.
Brainy: Really? I didn't think so.

J'onn: There's still one big hole in this plan. How do we send Supergirl back to this valley?
Kara: We fight fantasy with sci-fi.