Watch Supergirl Season 3 Episode 17 - Trinity

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Supergirl Season 3 Episode 17

First Aired: May 7, 2018

Description: Still reeling after learning about Lena's secret, Supergirl asks Guardian for a favor that could alter his relationship with Lena forever. Meanwhile, with all three Worldkillers united, Supergirl and the team brace for an epic battle.
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