Bryan Singer has described X-Men: Days of Future Past as an 'inbetwequel'.
Singer takes over the director's chair for the new X-Men film - which is the follow up to First Class.
But the movie will mix characters from that film with the first franchise and move between the seventies and modern day.
Speaking to Empire the director said: "I'd say it's not a sequel to one of the others. It's an inbetwequel - that's what I call it, for lack of a better word.
"It takes place about ten years, give or take, after X-Men 3 (X-Men: The Last Stand); and in the past it takes place about ten years after First Class.
"It takes place in the future and the past and then all over the world, from Russia to China, then France, and Washington, New York. It's got scope, but most of the scope is in the breadth of the story."
This is the first X-Men movie Singer has directed since he made the hugely successful X2.
James MCAvoy, Michael Fassbender and Jennifer Lawrence will be reprising the roles of Charles Xavier, Magneto and Mystique.
But Patrick Stuart, Ian McKellan, Hugh Jackman and Halle Berry are also back as Professor Xavier, Magneto, Wolverine and Storm.
X-Men: Days of Future Past is released 22nd May 2014.
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