Dr. Doom villain revealed in 'Fantastic Four' trailer and he looks pretty mad

It's on for the young heroes of Fantastic Four.

The new trailer dropped Sunday for the Fox/Marvel film featuring the first glimpse of villain Dr. Doom played by Toby Kebbell. Shield your eyes as you crawl under your desk.

He's not pretty, has got a big gripe and he's bad enough to take on four mutant superheroes including Mr. Fantastic (Miles Teller), Human Torch (Michael B. Jordan), Invisible Woman (Kate Mara) and The Thing (Jamie Bell).

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In fact, as Dr. Franklin Storm says ominously in the trailer, "If you want to stop him, it's going to take everything you have."

But first the cast is gonna party a little.

The entire Fantastic Four cast will appear at CinemaCon in Las Vegas next week to address all of this badness coming out and show off the film. And the film is due in theaters Aug. 7.