CBS has released a promo spot and images for their SUPERGIRL / THE FLASH crossover episode, titled 'World's Finest,' which is episode 18 in SUPERGIRL Season 1. 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 SUPERGIRL / THE FLASH crossover episode airs on CBS at 8 p.m. ET on March 28.
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