Johnson worked hard to get his body to look like Kerr's. Share on Facebook Share on X Google Preferred Share to Flipboard Show additional share options Share on LinkedIn Share on Pinterest Share on Reddit Share on Tumblr Share on Whats App Send an Email Print the Article Post a Comment Logo text For The Smashing Machine, Benny Safdie's sports biopic about legendary MMA fighter Mark Kerr (played by Dwayne Johnson), prosthetic makeup design guru Kazu Hiro (The Darkest Hour, Maestro) was confronted with two choices: craft a close resemblance to Kerr or merely capture his essence.