One day, they are not able to withstand anymore to block any attack from sentinel which is able to detect, absorb and copy-cat the mutans. Professor and Magnetio also feel regretful for the feud that causes the mutans divided that makes it as a threat for human. The only one way to get out from such a problem, is by go back to the past before Dr. Bolivar Trask (Peter Dinklage), has to create what he create from sentinel is used for mutan.
Logan is finally going to the past at the year, 1973 because his physical appearance cannot be changed since his body can heal any injury on his body. The Logan mission is quite hard since he should unify Charles Xavier (James McAvoy) and Erick Lehnsherr (Michael Fassbender) since these two have different mindset as a mutan.