Supergirl Season 1 Episode 18 - Worlds Finest

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Synopsis: Supergirl meets 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. Supergirl TV series is a live action series of the live action version of Kara Zor-EL who is the cousin of Kal-El better known as Superman. It stars Melissa Ben…

Air Date: March 28, 2016

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