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

Dwayne "The Rock" Johnson transforms into MMA and UFC fighter Mark Kerr in Benny Safdie's A24 biopic "The Smashing Machine," releasing this fall.

A24 is previewing "The Smashing Machine," directed by Benny Safdie and starring Dwayne Johnson as MMA fighter and two-time UFC Heavyweight Tournament Champion Mark Kerr.