Ryan Reynolds fears his dream Deadpool movie is a long way off because the script is so dark, violent and gritty, no studio will take on the project.

Reynolds portrayed the comic book killer in X-Men Origins: Wolverine and he's keen to star in a spin-off that delves into the mindset of the character - but he reveals the current script will need a major makeover before movie bosses will sign on.

He tells Empire, "I love Deadpool and there is a script that’s in development. But it’s so, so far into the R-rated zone... it’s a nearly Nc-17 world and I just don’t know if the studio would ever risk their reputation doing it.

"We’ve been developing it and we would never wanna do it unless you could it that R-rated way, so... it’s sitting there. You could do it for a pittance compared to the modern sort of epic scale superhero movies; it’s about a guy who knows he’s in a movie and knows he’s in a comic book, who is deeply mentally disturbed and hyper violent. And that’s tough to get by a studio."