'X-Men' Fight for Their Future in New 'Days of Future Past' Trailer

Mutants must put aside old grudges in order to stave off extinction in upcoming film

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After an agonizing four-month wait, the second trailer for X-Men: Days of Future Past has arrived in all its catastrophic, apocalyptic glory, complete with giant killer robots and grave exposition from real-life best buds Patrick Stewart and Ian McKellen.

X-Men: Days of Future Past and 60 other reasons to love 2014

Directed by Bryan Singer, Days of Future Past unites the casts of the original X-Men trilogy (Stewart, McKellen, Hugh Jackman, Halle Berry, Anna Paquin, Ellen Page and Shawn Ashmore) released between 2000-06 and the newcomers from 2011's X-Men: First Class (including James McAvoy, Michael Fassbender, Jennifer Lawrence and Nicholas Hoult).

The film begins in a future where all mutants are near extinction, as former foes Professor X (Stewart) and Magneto (McKellen) explain to Wolverine (Jackman) that in order to save their species, they must go back in time and join forces with their younger selves in order to stop this dystopia from ever happening. The new trailer offers a peak at the much younger Professor X and Magneto (McAvoy and Fassbender) hashing out their differences amidst crumbling cities, as well as a look at series newcomer Peter Dinklage, who plays Bolivar Trask, a military scientist behind the mutant-hunting Sentinels that we finally get to see wreaking some truly epic havoc.

X-Men: Days of Future Past hits theaters on May 23rd, and will follow-up Marvel's two other spring offerings, Captain America: The Winter Soldier, opening April 4th, and The Amazing Spider-Man 2, which opens on May 2nd.