On Supergirl Season 4 Episode 15, Lena turns to her devious brother, Lex, to finish her serum in time to save James' life. Does she succeed?

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On Supergirl Season 4 Episode 15, a very sick Lex Luthor is furloughed out of prison and helps Lena perfect her serum to save James Olsen's life. But the longtime villain has other plans in mind for National City and it's hero, Supergirl.

Episode Details

On Supergirl Season 4 Episode 15, Lex Luthor gets a furlough from prison due to ill health, but what is the villain's master plan to take down a hero?

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Supergirl Season 4 Episode 15 Quotes

Lex and Lena Luthor, teaming up to save Superman's best pal. What would mother think?

Lex Luthor

I'm not the one who accidentally poisoned myself with Kryptonite in a quixotic attempt to kill an invincible man. And while I do find the irony that you now need the Black Kryptonite to cure yourself just delicious, you are my brother, Kex. I do want to save you. Besides, how can you pay your debt to society if you're already dead?