Watch Supergirl Season 1 Episode 18 online via TV Fanatic with over 1 options to watch the Supergirl S1E18 full episode. Affiliates with free and paid streaming include Amazon.

Episode Details

On Supergirl Season 1 Episode 18, Kara gains a new ally when The Flash suddenly appears from an alternate universe and helps Kara battle Silver Banshee and Livewire.

Rating: 4.5 / 5.0 (94 Votes)
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Supergirl Season 1 Episode 18 Quotes

I'm Barry Allen, fastest man alive. I also think that I'm on the wrong Earth. I'm gonna need your help.


Winn: I saw that winning the people back wasn't going so well.
Kara: I have tried everything I can think of. Last night, I helped a family assemble their IKEA table.