Supergirl: Official Flash Crossover Promo

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Here's our first peek at the upcoming Supergirl / The Flash crossover, in which Grant Gustin's Barry Allen meets Melissa Benoist's Kara Danvers. The promo is really just a fifteen-second teaser that shows a glimpse of the two DC superheroes looking rather serious.

The special episode of Supergirl "World's Finest" drops on March 28.

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