The first poster for The Flash and Supergirl Crossover episode has been released, plus a plot synopsis for the upcoming episode.

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“Worlds Finest” – Kara gains a new ally when the lightning-fast superhero The Flash (Grant Gustin) 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.

Source: Comicbookmovie

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