Russell Crowe "went wild" in The Man With The Iron Fist, producer Eli Roth has revealed.
The Robin Hood star plays a character called Jacknife in the martial arts film, directed, co-produced and co-written by Wu-Tang Clan's RZA.
"The whole movie wasn't on Crowe's shoulders, so he was free just to step in and go completely insane... he just went wild with it," the Hostel director told The Guardian.
"Basically, it's a kung fu Star Wars movie. You think he is just a stranger passing through town, but in the opening scene, Crowe makes a very big statement with his knife."
Eli previously revealed how contrary to his fiery reputation, Russell is actually a "sweetie pie".
"Nobody believes this but I say Russell Crowe is an absolute sweetie pie," he said.
"He was fantastic, he was great and really funny and really cool. It's like I am outing him as a really sweet and easy-going guy. He was hilarious, and we had such a fun time making the movie."
The Man With The Iron Fist, which also stars Lucy Liu and Pam Grier, is set for release later this year.