James McAvoy Donned Drag As X-Men's Professor X

James McAvoy has warned comic book fans to expect the unexpected when they watch X-Men First Class - one scene in the prequel even sees his mentor character Professor Charles Xavier don drag.

The Last King of Scotland star, who portrays a younger version of the mind-reader previously played by Patrick Stewart, admits director Matthew Vaughn had an oddball approach to making the film and came up with a number of "weird" and "ridiculous" ideas.

He tells New York Magazine, "(Vaughn) goes, 'Eh... let's have you dressas a prostitute.' And I'm like, 'I play Professor X'. (It's) weird, weird s**t. It's not like dangerous filmmaking or anything, but it's fun, it's irreverent, and it's not what you'd expect...

"You have to commit, to try and believe it even more, maybe because it's so ridiculous".

But McAvoy insists the superhero mutant movie will be worth the wait.

The Scottish star recently admitted he and co-star Michael Fassbender had their reservations about the final cut of the film, but were relieved when they realised it was actually good.

He told Wenn, "I phoned Michael within a half hour (of seeing it) saying, 'Dude, you've got to see this movie really quick because you're gonna be relieved...'

"We were worried because sometimes these things are a nightmare to makeand it's well documented so there's no point in hiding out but it turnedout really good.

"I think we always thought it could either be really different and really brilliant or really bad and really different".