Dwayne "The Rock" Johnson has been one of the biggest movie stars in the world for over a decade now. Once earning the unofficial nickname of "franchise Viagra" for his ability to invigorate a movie series, he has starred in the biggest of big films, from "Fast & Furious" to "Moana." He became so popular that there was even talk of Johnson running for President at one point. But chasing big bucks at the box office didn't always result in the most rewarding on-screen roles or challenges. That's all about to change, though.

Speaking at the Venice Film Festival (via BBC ), Johnson was on hand for the premiere of his new movie "The Smashing Machine," in which he plays UFC legend Mark Kerr . It's a full-blown transformation for Johnson and the kind of movie we're not used to seeing him i

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