Watch Supergirl Online: Season 4 Episode 18

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Did Kara and Lena find out the truth?

On Supergirl Season 4 Episode 18, the friends made their way to Stryker island with the aim of finding out how they could defeat Lex.

Meanwhile, Kara tried to find out more information about Lex at the prison.

However, she quickly realized that her decision to befriend a nosy prisoner was not a good one.

PTSD - Supergirl Season 4 Episode 17

Elsewhere, Kelly encouraged James to talk to someone for his PTSD.

Who did he turn to?

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

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

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Supergirl Season 4 Episode 18 Quotes

If the government wants to stop me from helping people, let them try.

Supergirl

You're not the only one who's friends with a Luthor.

Supergirl