The first official trailer of the crossover episode which stars Supergirl and The Flash has been released online.
The episode is number 18 of Supergirl and is titled “World’s 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.”
The episode is scheduled to air on March 28.
Watch the trailer below: