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. "x-men days of future past clip" x-men days of future past" "x-men: days of future past" "trailer" "official trailer" "official" "HD" "2014" "official trailer 2014" "hugh jackman" "jennifer lawrence" "michael fassbender" "patrick stewart" "ellen page" "marvel" "x-men" "clip" "movie clip" "quicksilver" "power piece" "b-roll" "footage" "premiere" "new york city premiere" "x-men days of future past premiere" "interview" "red carpet"