Supergirl

Season 1 Episode 18

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Worlds Finest

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.

Season: 1
Episode: 18
Air Time: 9:00 PM EST
Buy or Stream: Amazon
Air Date: 2016-03-28
Air On: CW