She's My Legacy  Season 4 Episode 16
Lex Luthor needs the Harun-El to save the Red Daughter from an infection before he loses everything he's worked for.

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Katie Yu/The CW
Supergirl Season 4 Episode 16: "The House of L"
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Supergirl Season 4 Episode 16 Quotes

Supergirl: How are you doing this?
Lex: How do you think I did it? I'm Lex Luthor.

Lex Luthor: My father was a bad man too.
Mikhail: What did yours do?
Lex Luthor: He stayed.