In the first trailer for 'The Flash,' Michael Keaton reprises his role as Batman alongside Ezra Miller

Michael Keaton is reprising his role as the Dark Knight in "The Flash," 30 years after he last wore the cape and cowl in 1992's "Batman Returns"

On Tuesday, attendees at CinemaCon, a meeting for movie theatre owners and studios, got their first glimpse at Keaton

In the standalone superhero film, which stars Ezra Miller as Barry Allen, aka The Flash.

A secret bookcase door opens in the film, revealing a murky room full of Batsuits

 Later, The Flash and Supergirl (Sasha Calle) enlist Keaton's Batman in a multiverse adventure involving multiple versions of the DC characters.

"Are you all set?" As the camera pans to Keaton's Bruce Wayne, who is maskless and dressed in a Batsuit in what appears to be Wayne Manor, Barry asks.

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