Real name: Onslaught
Occupation: Would-be conqueror
Group affiliation: None
Base of operations: Central Park citadel, astral fortress
First appearance: X-Men (Vol. 2) #53 (1996)

Height: 6' in Professor X's body, 10' in his own form; could grow more than two stories tall
Weight: 190 lbs. in Professor X's body, 900 lbs. in his own form
Eyes: Field of red
Hair: None

Powers: Onslaught possessed the combined mutant abilities of progenitors Professor X and Magneto. He could induce illusions, temporary mental or physical paralysis, loss of specific memories, or total amnesia; project mind-numbing mental bolts; and sense the presence of mutants within a small radius. Also, Onslaught was able to shape and manipulate magnetic fields, both natural and artificial. Using his powers to augment his strength, he could lift up to 100 tons. Other abilities included telekinesis and astral projection.

Weapons: None

The psionic force of nature known only as Onslaught sprang forth from the fractured psyche of mutant mentor Charles Xavier and the genetic terrorist called Magneto. Powered by his progenitors' rage, Onslaught laid siege to humanity -- touching off a cataclysmic conflict destined to deprive a world of its most revered icons!

History: Onslaught was a sentient psionic entity created from the consciousness of two mutants: Professor Charles Xavier, telepathic founder of the heroic X-Men, and the charismatic subversive known as Magneto, Master of Magnetism. During a battle between the X-Men and Magneto's Acolytes, Xavier used his telepathic powers to shut down Magneto's mind, rendering him catatonic. During the psionic contact, Magneto's anger, grief and lust for vengeance entered Xavier's consciousness, commingling with every long-suppressed negative feeling Xavier had endured during the last 30 years. This aggregation resulted in the being known as Onslaught.

Onslaught remained dormant for some time. Gradually, Xavier's frustration with his dream of mutant-human harmony began to increase -- exacerbated by the daily growth of anti-mutant hysteria, the deaths of dozens of mutants from the lethal Legacy Virus and his own failed attempt to rehabilitate the mutant sociopath called Sabretooth. Xavier reached his breaking point when anti-mutant humans killed a young mutant near the grounds of the Xavier Institute for Higher Learning, the secret base of the X-Men. It was at this point that Onslaught awakened within Xavier and began to manifest himself to others.

Following an encounter with the mystically empowered criminal called the Juggernaut -- Xavier's stepbrother, Cain Marko -- Onslaught invaded a government-sanctioned Sentinel base. He downloaded the current specifications for the mutant-hunting androids and erased portions of the memories of the employees working in the clandestine factory. Soon after, while hiding in Xavier's mind, Onslaught encountered the telepathic, telekinetic X-Man. Young Nate Grey pulled the Professor's body from the astral plane, a feat never before achieved. Through X-Man's actions, Onslaught was able to escape Xavier's mind and move independently. After taking full possession of the Professor's mind and body, Onslaught-as-Xavier called together the X-Men. When they resisted his plan to turn them into soldiers fighting a total war against humans, Onslaught revealed himself to the X-Men and attempted to destroy the outlaw adventurers. The time-tossed mutant soldier called Bishop -- who remembered childhood stories of a traitor betraying and killing the X-Men, and began to realize that the guilty party was Xavier as Onslaught -- rescued his teammates. Taking Xavier's body with him, Onslaught escaped.

Once free, Onslaught created a childlike psionic projection named Charles to gain the trust of young Franklin Richards, a mutant possessing the latent power to alter reality. Onslaught succeeded in capturing the child despite a rescue attempt by Franklin's parents -- Mr. Fantastic and Invisible Woman, members of the legendary super-team known as the Fantastic Four. Now carrying Franklin and Xavier, Onslaught captured X-Man -- intending to use his raw psionic power to fuel his plans to transform the human race into a collective consciousness. Onslaught returned to New York, reprogramming the Sentinel robots to obey his commands and form a protective circle around Manhattan, sealing off the island from the rest of the world.

The X-Men, the Fantastic Four and the Avengers, Earth's Mightiest Heroes, challenged Onslaught. Their first confrontation with the entity and his minions resulted in the rescue of a now-powerless Xavier, who retained his usual benevolent personality. Onslaught now existed as psionic energy contained within his armor. A second and final confrontation occurred at his Central Park citadel. After a number of attempts to free Franklin and X-Man from Onslaught's seemingly impervious armor, the heroes regrouped. During their next assault, X-Man Jean Grey used her telepathy to turn off the part of the monstrous Hulk's mind that contained the rationality of his alter ego, Dr. Bruce Banner. The now-savage Hulk, possessed of a nearly animalistic intelligence and unbelievable strength, battled Onslaught and tore apart his armor. The resulting explosion of psionic energy separated Banner and the Hulk, and Onslaught was left as an energy being, immune to most physical harm. Onslaught then used Franklin's powers to create a second sun that would destroy the heroes and Manhattan.

The Avenger known as Thor -- Asgardian God of Thunder, master of the storm and lightning -- flew into the energy being, disrupting Onslaught's form. Realizing that Thor's efforts alone were insufficient to destroy their adversary, the non-mutant members of the Avengers and the Fantastic Four entered the energy field. The X-Men were unable to do likewise -- as it was theorized that if Onslaught, a being of mutant origin, came to possess a mutant host, he would become unstoppable. Onslaught dissolved, seemingly destroyed, along with the heroes who had thrown themselves into the rift. The remaining Sentinels were disabled, Franklin and X-Man were rescued, and Manhattan was returned to normal. Later, it was revealed that the Avengers and the Fantastic Four did not die, as had been surmised. Rather, the heroes were reborn in a pocket universe created by Franklin. The Avengers and the Fantastic Four returned to their rightful home months later, possessing only hazy memories of their time on Counter-Earth.