Superhero universes will cross when CBS’ Supergirl Kara Danvers meets The CW’s The Flash Barry Allen in the episode “World’s Finest” airing on Supergirl on Monday, March 28 at 8/7c.

Criminals and villains beware: Supergirl will have some help when she tag-teams with The Flash in an upcoming episode of Supergirl,

Here is the official synposis: “Kara (Melissa Benoist) 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 (Italia Ricci), and Livewire (Brit Morgan) in exchange for her help in finding a way to return him home.”

It will be interesting to see how these two heroes work together and the chemistry between Kara Danvers and Barry Allen.

Check out the promo:

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