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Description by couchtuner for 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.
Watch It Here : Supergirl Season 1 Episode 18 Worlds Finest
