X-MEN: DAYS OF FUTURE PAST - Official Trailer (2014) - YouTubeX-MEN: DAYS OF FUTURE PAST - Official Trailer: 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. X-Men: Days of Future Past ava
