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Mercy Graves is a major antagonist in the fourth season of the television series Supergirl, set within the Arrowverse.

She was a terrorist, a former Cadmus agent and the former head of security at Luthor Corp. She was also the sister of Otis Graves and the ex-girlfriend/former friend of Lex Luthor.

She's based on the character of the same name from the DC Animated Universe

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