A new photo behind-the-scenes from X-Men: Days of Future Past was released Monday, featuring many of the cast members dressed in '70s clothing.

The photo, posted by Empire Online, features James McAvoy as Professor X, Michael Fassbender as Magneto, Hugh Jackman as Wolverine and Nicholas Hoult as Hank McCoy. Director Bryan Singer is placed in the middle of the cast members, all of them looking at the camera in their '70s garb.

The film features the present-day X-Men sending Wolverine (Hugh Jackman) back into the past in order to ultimately "save" the future. As such, there will be younger and older versions of the characters Professor X and Magneto, at least. The older versions of Professor X and Magneto will be played by Patrick Stewart and Ian McKellen, who played them in the original X-Men film trilogy.

Other actors who will appear in the film include Jennifer Lawrence as Mystique, Halle Berry as Storm, Ellen Page as Kitty Pryde and Peter Dinklage as Bolivar Trask, the main villain who intends to destroy all mutants using robotics.

X-Men: Days of Future Past is the seventh film in the X-Men film series and the first to properly combine the actors in the first trilogy with the actors from X-Men: First Class.

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X-Men: Days of Future Past is scheduled for release in theaters on May 23, 2014.

Watch the trailer for X-Men: Days of Future Past here:

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X-Men, X-Men Days of Future Past