Watch Supergirl Season 3 Episode 17 online via TV Fanatic with over 1 options to watch the Supergirl S3E17 full episode. Affiliates with free and paid streaming include Amazon.

Episode Details

On Supergirl Season 3 Episode 17, with the Worldkillers united, Supergirl and team brace for an epic battle, and James must make a decision about he and Lena.

Rating: 4.3 / 5.0 (120 Votes)
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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.