Wolverina pošljejo v preteklost, da bi spremenil tok zgodovine in preprečil pogubo človeštva in mutantov.V sagi o konfliktu med ljudmi in mutanti se obe strani znajdeta pred popolnim uničenjem, ko vojska izgubi nadzor nad uničevalnimi stroji, ki naj bi pokončali mutante. Da bi preprečili popolno uničenje človeštva, Profesor X in Magneto združita moči in v preteklost pošljeta Wolverina, da bi mlade mutante usmeril na pravo pot in tako preprečil usodni konec. Toda Wolverine kmalu naleti na težave, saj mladi Profesor X ne premore zanj značilne modrosti, vročekrvni Magneto pa hrepeni zgolj po maščevanju. Kljub vsemu je Wolverine odločen, da ne bo dopustil ponovitve uničujoče prihodnosti.
Sentinels, robots that were created for the purpose of hunting down mutants were released in 1973. 50 years later the Sentinels would also hunt humans who aid mutants. Charles Xavier and his X-Men try their best to deal with the Sentinels but they are able to adapt and deal with all mutant abilities. Charles decides to go back in time and change things. He asks Kitty Pryde who can send a person's consciousness into the person's past to send him but she can only send someone back a few weeks because if she sends someone back further it could harm them. So Logan decides to go back himself because he might be able to withstand it. So Charles tells him that it's Mystique who's responsible because when she learned about the Sentinels she sought out Bolivar Trask the man who created them and killed him. She would be caught and studied and her ability to change was somehow added to the Sentinels which is why they can adapt. Logan must go to the younger Charles and ask him to help; problem is that he was despondent at that time and without his powers because he took a drug which allows him to walk but takes away his powers. Logan is also told to find Magneto.