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Watch Supergirl Season 2 Episode 4 online via TV Fanatic with over 1 options to watch the Supergirl S2E4 full episode. Affiliates with free and paid streaming include Amazon.

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Episode Details

On Supergirl Season 2 Episode 4, Kara and Alex end up at an alien fight club while investigation an alien murder, and Supergirl starts training Mon-El.

Show:

Supergirl

Season:

Supergirl Season 2

Episode Number:

4

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