Supergirl -- "Red Dawn" -- Image Number: SPG421a_0360b.jpg -- Pictured: Nicole Maines as Nia Nal/Dreamer (center) -- Photo: Sergei Bachlakov/The CW -- © 2019 The CW Network, LLC. All Rights Reserved.

Supergirl is coming face-to-face with Red Daughter.

Supergirl episode 421, “Red Dawn,” will see the Luthors out in force and playing all sides.

SUPERGIRL BATTLES RED DAUGHTER — Kara (Melissa Benoist) comes face to face with Red Daughter and the two engage in an epic battle. Determined to find a way to extract the Harun-El, Lena (Katie McGrath) turns to an unlikely source for help — Lillian Luthor (guest star Brenda Strong). Meanwhile, Alex (Chyler Leigh) realizes she’s missing parts of her memory, and Brainy (Jesse Rath), Nia (Nicole Maines) and J’onn (David Harewood) set out to track down aliens who have been abducted by Lex.

Supergirl episode 421 airs on May 12, 2019.

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