Flash-Supergirl crossover: See the first promo | EW.com
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See the first Flash-Supergirl crossover teaser promo

Plus: See a sneak preview of Supergirl's race against The Flash, and check out new photos!

Blink and you may miss it: CBS has released the first teaser promo for the highly anticipated Flash-Supergirl crossover.

Here’s how the crossover works: 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.

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Below, check out photos from Scarlet Speedster and Maiden of Might’s super adventure, as well as a sneak preview of their race:

Image Credit: Michael Yarish/CBS

Image Credit: Robert Voets/CBS

Image Credit: Robert Voets/CBS

Image Credit: Robert Voets/CBS

Image Credit: Robert Voets/CBS

Image Credit: Robert Voets/CBS

Image Credit: Robert Voets/CBS

The Flash-Supergirl crossover will air Monday, March 28 at 8 p.m. ET on CBS.