Gears of War film writer Chris Morgan thinks beefy ex-wrestler Dwayne "The Rock" Johnson would make a great Marcus Fenix because he can be tough and show his emotions.
"Normally when I write, I think about the actor I'm writing for, but this one's been difficult," Morgan told MTV Movies.
"It is a vital casting choice. It's counter-intuitive really, because it seems like you want to get a big character - a big tough guy who can play it stoic the whole time - but in my experience, dealing with macho sorts of movies and dealing with Dom [Vin Diesel's character in Fast & Furious] and that kind of stuff, it's harder to play the tough guy than an emotional character who's all over the place.
"The Rock is awesome," he added. "There's a genuine actor. Not only can he play the tough guy, but he can also play the nuanced, sensitive funny sad moments as well."
Morgan said the actor playing Fenix also needn't be as muscular as his virtual counterpart, so long as he's "a guy you believe can throw a punch and a guy you believe is stoic, locked in his own head, and [can] show emotion without telegraphing it".
Casting hasn't yet begun, as the Gears of War script has only just been finished and the team is now budgeting out the project.
Die Hard 4.0 director Len Wiseman will boss the project, and the film is expected in cinemas next year.