“X-Men: Days of Future Past” final trailer

The final trailer for the upcoming “X-Men: Days of Future Past” doesn’t disappoint.

From the clip description: 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.

Opens May 23.