Packs a nostalgic wallop, but not all the blows land

The contradictions of mixed martial arts brawler Mark Kerr can’t be contained by a ring, an octagon or a film.

- AMY NICHOLSON FILM CRITIC

ERIC ZACHANOWICH A24 EMILY BLUNT and Dwayne Johnson play a tempestuous couple in "Machine."

A vulnerable man with a brutal career, he went undefeated on the mat while struggling in his private relationships and public addiction to painkillers, which he bravely revealed in John Hyams’ 2002 HBO documentary “The Smashing Machine: The Life and Times of Extreme Fighter Mark Kerr.”

In that footage, shot between 1997 and 2000, you're continually startled by how Kerr could clobber his opponents until some lost teeth — putting himself in a mental state he once likened to being a shark in a feeding frenzy — and then after the bell, flash a smile so wide and happy, it split his own head in half.

That's Dwayne “The Rock” Johnson's whole thing too: Kill’em with charm. So it’s as all-natural as his daily diet of organic chicken breast that the wrestler-turned-blockbuster-star would want to play Kerr in his own pursuit of excellence. He’s overdue for a sincere indie movie. Fair enough. Yet bizarrely, Johnson and writer-director Benny Safdie (“Uncut Gems,” “Good Time”), working solo without his brother Josh, have decided to simply shoot Hyams’ documentary again.

These two high-intensity talents, each with something to prove, seem to have egged each other on to be exhaustingly photorealistic. Johnson, squeezed into a wig so tight we get a vicarious headache, has pumped up his deltoids to nearly reach his prosthetic cauliflower ears. And Safdie is so devoted to duplicating the earthy brown decor of Kerr's late-'90s nouveau riche Phoenix home that you'd think he was restoring Notre Dame. In setting out to establish his own style, Safdie just mimics another.