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"X-Men: Days of Future Past" trailer debuts

The official trailer for next year's "X-Men: Days of Future Past" has arrived, and it's got fans seeing double -- of some of their favorite mutants, that is.

Patrick Stewart, Ian McKellen, Hugh Jackman and other members of the original "X-Men" cast have returned for this sequel, and a time-travel storyline has them joining forces with the younger incarnations of the characters from "X-Men: First Class," including Michael Fassbender as Magneto, James McAvoy as Charles Xavier and Jennifer Lawrence as Mystique.

Directed by Bryan Singer, "X-Men: Days of Future Past" will arrive in theaters on May 23, 2014.

Watch the clip below:

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