It may only be 10 seconds long, but a new promo for the March 28 episode of Supergirl clearly shows the lightning-fast superhero The Flash (Grant Gustin) on the CBS show.

The new trailer marks the first time we see the two superheroes together on screen as the much-anticipated crossover episode looms on the horizon.

In “World’s Finest,” Supergirl (Melissa Benoist) gains a new ally when The Flash appears from an alternate universe and helps her in a battle in exchange for help finding a way to return home.

RELATED: CBS Reveals Poster, Plot of ‘Supergirl’ and ‘The Flash’ Crossover


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