Watch: Supergirl & The Flash Featurette #2
There’s a new superhero in National City! Kara gains a lightning-fast ally when The Flash arrives from another dimension. The duo must team up to battle Silver Banshee and Livewire while trying to get The Flash home. Go behind the scenes of this epic crossover and don’t miss Supergirl Monday, March 28 at 8/7c. Only CBS
"Worlds Finest" episode synopsis:
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 Flash and Supergirl crossover airs Monday, March 28th at 8pm ET on CBS starring Melissa Benoist and Grant Gustin.