Supergirl learns the true depth of Serena's nefarious plans for Earth. Supergirl, Mon-El and Alura must devise a plan to stop her before Serena gets to Earth. J'onn prepares to say goodbye to his father.
Melissa Benoist, Mehcad Brooks, Chyler Leigh, Jeremy Jordan, David Harewood, Calista Flockhart, Chris Wood, Floriana Lima
Action, Sci-Fi
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