- —Mister X[src]
Born into wealth, the man known only as Mister X became fascinated with death as a child when he saw a woman get hit by a car. The experience triggered his latent telepathy, forming a bond with the dying woman. He subsequently spent years attempting to recapture the thrill of that experience through other pursuits but finally sought out death again when he placed his pet dog in an oven. He slew his appalled parents shortly thereafter, beginning a life dedicated to the killing arts.
In an effort to become the greatest killing machine in history, X traveled the globe to learn and train with various combat teachers, slaying each after surpassing their skills and scarring himself in a ritual fashion for each life he took. Destroying all records of his life, Mister X then vanished from public view to embark upon his next goal of slaying fighters who professed to being the best to prove himself as the superior fighter.
Eventually, X learned of the mutant adventurer Wolverine and sent his operatives to test Wolverine's famed battle prowess. Subsequently defeating Wolverine himself, X sought his signature in order to achieve the title of "The Best There Is," then invited Wolverine to join him in a new murder avant-garde campaign. Enraged, Wolverine broke free and engaged X in a savage battle, losing control of himself in a berserker rage. The fight was interrupted by X's super-strong bodyguard Blok who, much to X's annoyance, knocked Wolverine unconscious. Feeling that the fight ended unfairly, X released the unconscious Wolverine with a note promising a rematch. Soon after, X secretly aided Wolverine against the clandestine Weapon X program, not wanting them to interfere in their fight. X's rematch with Wolverine came weeks later when both entered the annual Bloodsport tournament on the island nation of Madripoor of which X was the reigning champion. Before his duel with Wolverine, Mister X managed to defeat the Taskmaster, who happened to be one of the most proficient fighters on the planet. Both Mister X and Wolverine fought their way to the championship bout, during which Wolverine realized that X was a telepath who used his ability to anticipate an opponent's moves. After Wolverine succumbed to another berserker rage, X began losing his fight but was again saved by Blok and escaped.
Mister X was the reigning champion of Madripoor's Annual Bloodsport Fight Tournament, but was bored of his riches and fame. In response, he faked his own death and joined Norman Osborn's Thunderbolts for the sole purpose of finding an opponent capable of testing his skills.
On his first mission with the team, Osborn ordered Yelena Belova to lead the current Thunderbolts to kill former Thunderbolt, Songbird. X helped the team to capture the Black Widow (revealed to be Natalia Romanova), Songbird, and Nick Fury. He was later assigned to assassinate the Agents of Atlas with the Thunderbolts. When the Agents of Atlas arrived, he and the Thunderbolts attacked. While Venus was singing, he had hallucinations about women he killed and fired his gun wildly at Venus, but was taken down by Namora. After he came to, he picked up a sword and sliced Bob Grayson's stomach open and was then attacked by Ken Hale. When Venus realized Bob was dead, she started crying, causing a more negative effect than her singing, and X saw a world with no more war. The Agents were able to escape. The team also battled Spider-Woman.
During Siege, Mister X and the Thunderbolts fought against the Mighty Avengers. The Thunderbolts sought out the Spear of Odin to help Osborn storm Asgard, which X gleefully accepted to do for the chance to kill an Asgardian god, and later did so while procuring the spear. Before they could bring the Spear to his "master", Osborn, he was betrayed and shot by his fellow Thunderbolt Paladin, who took the spear from him and with the help of another Thunderbolt, Ant-Man, made sure that Osborn didn't get his hands on the spear. Mr. X was savagely beaten and disarmed by Quicksilver, who openly mocked Mister X's inability to hurt him despite Quicksilver's limited hand-to-hand combat experience. Mr. X disappeared before being arrested.
Low-Level Telepathy: Mister X is a low-level telepath capable of reading an opponent's mind in order to anticipate their moves in combat.
- Psionic Resistance
- Mister X is a master of all known forms of both armed and unarmed combat, including numerous martial arts, boxing, and swordplay. He is also an expert assassin and escape artist, and is highly proficient with many weapons.
- Mister X's powers only work in one-on-one encounters, fighting multiple enemies doesn't allow him the time to multi-task and read all their minds. He is also incapable of predicting and reading an opponent's mind if the opponent doesn't even know where they are going to strike themselves. The Iron Fist was able to use the Drunken Style to exploit this weakness and Luke Cage with a scrambled brain left Mister X's powers useless. Supergenius Amadeus Cho was able to successfully attack Mister X using a complicated pattern of ricocheting arrows; while Mister X could read Cho's mind, he was unable to understand it well enough to avoid the attack. Mister X's telepathy is ineffective against minds that are shielded against psychic probes or are animalistic in nature. His telepathy is also only helpful if his reflexes can keep up. This is how Quicksilver (Pietro Maximoff) made quick work of him: Mister X was able to read Quicksilver's mind but was not able to react to his attacks, allowing Pietro to break several bones and render him severely crippled.
- Mister X keeps a trophy room stocked with various weapons including John Dillinger's tommy gun, an ancient African tribal spear, and a semi-automatic flamethrower given to him by Saddam Hussein.
- 19 appearance(s) of Mister X (Earth-616)
- 1 mentions of Mister X (Earth-616)
- 24 image(s) of Mister X (Earth-616)
- 3 quotation(s) by or about Mister X (Earth-616)
- 1 item(s) used/owned by Mister X (Earth-616)