CBS officially releases the promotional photos for episode 18 of season 1 of Supergirl, titled “Worlds Finest”, which is the crossover episode with The CW television series The Flash.
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.
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