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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.
Serie: Supergirl
Director: Nick Gomez
Guest Star: Brit Morgan, Chris Vance, Christopher Showerman, Grant Gustin, Harriet Sansom Harris, Italia Ricci, Jenna Dewan
Episode Title: Worlds Finest
Air Date: 2016-03-28