A mutant with accelerated healing, enhanced senses, adamantium-laced skeleton and retractable bone and adamantium claws. With the mutant race on the verge of extinction, Wolverine's healing factor makes him the only X-Man capable of withstanding the rigors of time travel. He has to survive long enough to complete the most important mission of his life: to go back in time to prevent a chain of events that will bring about the end of mutantkind. Director Bryan Singer stated that "Hugh of the future is sent, his consciousness is sent into his younger self [and] Hugh gets to play both parts because [Wolverine] is ageless." Writer Simon Kinberg explained in an interview why Wolverine is the time traveler and he stated "We made the decision for a lot of reasons... One reason is that he's the protagonist of the franchise, and probably the most beloved character to a mass audience."
Source from Wikipeida