A huge TV event is almost here, as The Flash will take part in a crossover so big, he'll have to jump between both universes and TV networks, as he join forces with Supergirl in an upcoming episode of the CBS series.

“Worlds 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, on SUPERGIRL, Monday, March 28 (8:00-9:00 PM) on the CBS Television Network.

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CBS has released the key art and official plot description for the much anticipated Supergirl episode, airing March 28th, called “Worlds Finest.”The key art, depicting Supergirl (Melissa Benoist) racing against The Flash (Grant Gustin) in a stadium, is a direct homage to the cover of Superman #199 from 1967.Below is the official plot description:“Worlds Finest” is written by The Flash and Supergirl’s co-creator and executive producer Andrew Kreisberg along with Supergirl writer Michael Grassi, from a story by The Flash/Supergirl co-creator/EP Greg Berlanti. Nick Gomez, whose many TV directorial credits include episodes of Constantine, Daredevil and Chicago P.D., directed the episode.

Eric Goldman is Executive Editor of IGN TV. You can follow him on Twitter at @TheEricGoldman , IGN at ericgoldman-ign and Facebook at Facebook.com/TheEricGoldman