'X-Men: Days of Future Past' will centre on young Charles Xavier.

While the blockbuster movie features a huge ensemble cast, including the cast of the original 'X-Men' trilogy and the stars of 2011 prequel 'X-Men: First Class', producers felt the film very much belonged to James McAvoy's character as he evolves into his older, wiser self - played by Sir Patrick Stewart in the earlier films.

Screenwriter Simon Kinberg said: ''One of the things we talked about a lot was, 'Whose movie is it?' Because as much as any ensemble movie is about all the main characters, there is a primary point of view or primary arc that you're tracking over the span of the film.

''For us, very early on, we made the decision that it was young Charles' arc and that, really, the emotional story of the movie is watching him go from the guy who's lost his legs, lost his best friend, lost his sister, and in some ways lost his mind, to a guy who will become the all powerful, benevolent Professor Xavier.''

The character is expected to be in a very dark place at the start of the new movie following the events of the 2011 movie.

Kinberg added: ''When you start the movie, McAvoy is really about as far as one can be from the Patrick Stewart that we know from 'X-Men'. We're really watching him take the first big step towards owning that chair and becoming a leader.''

'X-Men: Days of Future Past' is due for release in May 2014.