X-Men: Days of Future Past | Official Trailer 2 [HD] | 20th Century FOX

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.