Dwayne Johnson stars as former wrestler and UFC star Mark Kerr in a new trailer for Benny Safdie's "The Smashing Machine."

Dwayne Johnson is playing MMA and UFC fighter Mark Kerr in the biopic "The Smashing Machine."Johnson looks unrecognizable in the movie, appearing to wear a wig and prosthetics."The Smashing Machine," written and directed by Benny Safdie,

Dwayne Johnson aka The Rock is back in the ring but this time not as the WWE player that he is well known as. The trailer of the upcoming film `The Smashing Machine` based on the life of UFC legend Mark Kerr has been unveiled.