2016 Mar 21

1×18 – “Worlds Finest” Promo

The crossover episode is almost here! Check out the promo video for The Flash and Supergirl crossover below.

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.