In the future, Sentinels rule a dystopian United States, and mutants are hunted and placed in internment camps. Having conquered North America and hunted all mutants and other superhumans, the Sentinels are turning their attention to the rest of the world. On the eve of a feared nuclear holocaust, the few remaining X-Men, while making a desperate attempt to stop the Sentinels, send Wolverine's mind backward through time, to possess the body of his younger-self and to prevent a pivotal event in mutant–human history and the cause of these events: the assassination of Senator Robert Kelly along with Charles Xavier and Moira MacTaggert by Mystique's newly reassembled Brotherhood of Evil Mutants.
