Supergirl

Season 4 Episode 15

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O Brother, Where Art Thou?

Secretly furloughed from prison due to failing health, Lex Luthor visits his sister, Lena, to seek her help finding a cure. Savvy as ever, Lena is suspicious of Lex's motives but when she's faced with a life and death situation, she must decide how she truly feels about her brother. Meanwhile, Supergirl and J'onn face off against Manchester Black. James' sister Kelly comes to town. The crossover continues on The Flash S03E08 Invasion! (II), Arrow S05E08 Invasion! (III) and DC's Legends of Tomorrow S02E07 Invasion! (IV).

Season: 4
Episode: 15
Air Time: 9:00 PM EST
Buy or Stream: Amazon
Air Date: 2019-03-17
Air On: CW