Lena at the DEO - Supergirl Season 3 Episode 17
Lena finally makes her way into the DEO to help save Sam. "Trinity" is the 17th episode of the show's third season.

Photo Credit:
Jack Rowand/The CW
Supergirl Season 3 Episode 17: "Trinity"
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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.