On Supergirl Season 4 Episode 21, Supergirl faces off against the Red Daughter and finds out Lex Luthor's overall plan for world domination.

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On Supergirl Season 4 Episode 21, Supergirl comes face-to-face with her clone, the Red Daughter. The two engage in an epic battle as Lex Luthor thrusts his plan of world domination in motion. Lena turns to Lilian for help with the Harun-El serum.

Episode Details

On Supergirl Season 4 Episode 21, Kara comes face to face with Red Daughter and the two engage in an epic battle, and Lena turns to Lillian Luthor for help.


Rating: 4.7 / 5.0 (51 Votes)
Show:
Supergirl
Season:
Episode Number:
21

Supergirl Season 4 Episode 21 Quotes

Jeez, this is America. You can't just kidnap a reporter.

Kara

Lena: Lex is planning on invading America.
Brainy: What?
Alex: You should have led with that.
Lena: Well, then you're gunna love this. Lex has a clone of Supergirl.
Alex: What?
Brainy: You should've led with that.