Supergirl Season 1 Episode 18 - Worlds Finest

Airdate: 2016-Mar-28

Episode summary:

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.

About Supergirl series:

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 star...Show more >