Official synopsis:

The ultimate X-Men ensemble fights a war for the survival of the species across two time periods in X-MEN: DAYS OF FUTURE PAST. The beloved characters from the original “X-Men” film trilogy join forces with their younger selves from the past, “X-Men: First Class,” in order to change a major historical event and fight in an epic battle that could save our future.

Directed by Bryan Singer. Stars Patrick Stewart, Ian McKellen, Hugh Jackman, James McAvoy, Michael Fassbender, Jennifer Lawrence, Nicholas Hoult, Ellen Page, Peter Dinklage, Halle Berry, Shawn Ashmore, Omar Sy, Daniel Cudmore, Fan Bingbing, Adam Canto, Evan Jonigkeit, Boo Boo Stewart, Evan Peters, Lucas Till, and Josh Helman.

‘X-Men: Days of Future Past’  hits theaters May 23.

[Via The Daily SuperHero]