Supergirl Season 1 Episode 18

Supergirl Season 1 Episode 18

Kara gains a new ally when the lightning-fast superhero The Flash suddenly appears from an alternate universe and helps Kara battle Siobhan, aka Silver Banshee, and Livewire in exchange for her help in finding a way to return him home.

Episode Title: Worlds Finest

Air Date: 2016-03-28

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