Watch Supergirl Online: Season 4 Episode 15

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What plan did Lex Luthor have to take over National City?

On Supergirl Season 4 Episode 15, Lena was shocked when her brother made his grand return. 

She was even more shocked when she learned the true extent of his abilities. 

Did his plan conflict with her decision to be a good person?

Meanwhile, Supergirl and J'onn went on a mission to take out Manchester Black once and for all. 

Welcome, Kelly Olsen - Supergirl Season 4 Episode 15

With James in the hospital and his life on the line, Alex tried to keep the peace by his bedside. 

Use the video above to watch Supergirl online right here via TV Fanatic. 

Paul Dailly is the Associate Editor for TV Fanatic. Follow him on Twitter.

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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?