Poster and plot for The Flash and Supergirl Crossover revealed

CBS has revealed the official poster and plot description for the upcoming The Flash and Supergirl crossover, a parody in itself of the cover of Superman #199, which you can check out below!

Episode 18 of Supergirl is appropriately titled “World’s Finest” and is officially described as follows:

“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.”

Melissa Benoist leads the cast of Supergirl as the title character alongside Mehcad Brooks as James Olsen, Laura Benanti as Alura Zor-El, Calista Flockhart as Cat Grant, Chyler Leigh as Alexandra “Alex” Danvers, Jeremy Jordan as Winslow “Winn” Schott, Jenna Dewan Tatum as Lucy Lane (sister of Lois), David Harewood as Hank Henshaw, Peter Facinelli as Maxwell Lord, with Dean Cain and Helen Slater.

The Flash and Supergirl crossover is set to air Monday March 28 at 8 PM ET on CBS. If you missed an episode of Supergirl, or just need a refresher, be sure to check out our weekly recaps by clicking here and read our recaps of The Flash by clicking here.