Flash & “Supergirl” Crossover Poster, Details

CBS has unveiled the first poster for the upcoming “Supergirl” episode on March 28th.which will see the series crossing over with The CW’s “The Flash”

The episode, “Worlds Finest,” sees titular heroine Kara (Melissa Benoist) score a new ally as the lightning-fast The Flash, aka Barry Allen (Grant Gustin) suddenly appears from an alternate universe.

Barry helps Kara battle Silver Banshee (Italia Ricci), and Livewire (Brit Morgan) in exchange for her help in finding a way to return him home.

“The Flash” already showed a hint of the crossover during a visit to Earth-2 earlier this season, the show itself dealing with the possibilities of infinite Earths and travel between them thanks to Barry’s ability.

Source: EW