Mister X is a fictional character, a supervillain of the Marvel Universe introduced in Wolverine #159 (February, 2001). His henchmen include T & A (nickname "Betty and Veronica" by Wolverine), and Blok.
Mister X is an extremely wealthy businessman who has demonstrated a psychological addiction to killing that, by his own account, started in his adolescence. His latent telepath power was awakened by seeing a woman who had been hit by a car, which fascinated him; he felt her die. This is very similar to the trauma that awakened Jean Grey's psionic abilities. He soon became obsessed with death.
As a youth, X committed several murder to recreate the high of telepathically connecting with another person at the moment of their death. He murdered his pet dog by locking it in an oven, followed soon after by his entire family, including his mother and father. Over the years X would commit hundreds of murders and had his identity erased. Using his family's considerable fortune, X traveled throughout the world and studied under some of the finest martial artist in the world. After X learned all he could from each of his teachers, he would kill them. The thrill of killing an opponent in hand-to-hand combat provided him with a rush that he had never dreamed of. X kept a public image of a handsome, single, wealthy socialite, while he secretly coveted the honor of being the greatest hand to hand combat fighter on earth, which, of course, meant killing all of the other greatest fighters.
For every murder, X would cut a scar somewhere on his body. By the time he met Wolverine, his torso was covered in hundreds of them arranged in an ornate pattern. X defeated Wolverine in their first battle, but was amazed at his opponent's skills, bravery, and tenacity. X told Wolverine the story of his life up to that point, and then offered to spare Wolverine's life if he would agree to join him in his gruesome quest, much as T and A and Blok had done. Wolverine refused and engaged X in battle once again. This time, hearing of X's crimes and the lives he'd destroyed over the years, pushed Wolverine over the edge, and he slipped into a berserker rage. While in this state, Wolverine's conscious mind essentially shut down and the primal, savage instincts brought on by his mutation took over. Even though X stabbed and slashed him with swords and knives, impaled him with a spear, shot him with a machine gun, and set him on fire with a flamethrower, Wolverine continued to fight. In the end, Wolverine's determination and healing powers proved too much for X to overcome. X himself received several severe injuries, including deep lacerations down the length of his chest and stomach. He would have been killed had his bodyguard, Blok, not interfered.
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