Dwayne Johnson undergoes his most dramatic on-screen transformation yet in the first trailer for “The Smashing Machine,” a biopic about two-time UFC heavyweight champ Mark Kerr. A24 pulled the curtain back on the drama Tuesday morning.

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.