‘X-Men: Days of Future Past’: Wolverine Assembles the Team in Amazing Final Trailer The previous trailer carried one simple message to movie fans around the world: “This is serious.” Now the third trailer for “X-Men: Days of Future Past” (in theaters May 23) screams “This is AWESOME!” Prepare your jaw to drop before clicking ‘play’ below. Will this be the best X-Men movie ever? Share your thoughts! “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 “X-Men: First Class,” in an epic battle that must change the past — to save our future.”