Supergirl, Lena, and Alex go on the hunt for Eve Tessmacher, whose true loyalties have been exposed. While James recovers from a trauma, J’onn seeks to commune with his father’s spirit to rediscover who he is supposed to be.

U.S. air dates are in MM.DD.YY form. U.K. air dates are in DD.MM.YY form.

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SUPERGIRL FACES HER BIGGEST CHALLENGE YET

Supergirl (Melissa Benoist) must deal with the destructive aftermath of Lex's (guest star Jon Cryer) nefarious plans. Shocked at what Lex has created, Supergirl faces her biggest challenge yet.

Ben Bray directed the episode with story by Gabriel Llanas and teleplay by Katie Rose Rogers & Brooke Pohl (#417).