SUPERGIRL Season 1, Episode 18 Promo; "Worlds Finest" - Crossover With THE FLASH
The Scarlet Speedster races into National City in this awesome new promo for next week's episode of Supergirl. Featuring our best look yet at the crossover, this one is going to be a must-see...
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, on SUPERGIRL, Monday, March 28th on CBS. Grant Gustin crosses over as The Flash.
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