Onslaught is a fictional character that appears in comic book published by Marvel Comics. The character first appeared in X-Man #15 (May 1996), and was co-created by writers Scott Lobdell, Mark Waid, and artist Andy Kubert.
The character of Onslaught has also been featured in video games and toy merchandise.
The character is first alluded to when a shadowy figure with Onslaught's distinctive word-balloon coloring and design is seen speaking with a frightened Mystique. "Onslaught" is first mentioned when the Juggernaut crashlands in Hoboken, New Jersey, having been hit hard enough by Onslaught to send him across the country. The character fully appears when it communicates with Jean Grey on the astral plane. Onslaught then imprisons Juggernaut within the Crimson Gem of Cyttorak and defeats the X-Men.
Onslaught is a psionic entity, revealed to have been created from the consciousnesses of Professor Charles Xavier and Magneto, when the dark part of Magneto's mind leapt into its counterpart in Xavier's mind when Xavier wiped Magneto's mind after Magneto's latest attack on Wolverine culminated in him tearing the adamantium out of Wolverine's body, overloading Wolverine's healing factor to the point where it shut down. It was eventually able to manifest itself as an independent entity from Xavier after an encounter with Nate Grey resulted in Xavier's astral form being 'forced' into the real world , thus 'teaching' Onslaught how it could give itself its own body. The villain intends to pursue Magneto's goal of saving mutantkind and giving them control over the planet. However, upon seeing the truth from Dark Beast's memories of his Earth in what happens if mutants controlled the world, Onslaught decides neither humans or mutants should rule, and intends to destroy both races. After kidnapping Franklin Richards and Nate Grey, usurping their psionic powers to greatly increase his own, changing his physical form, Onslaught fights the Avengers, Fantastic Four, the Hulk, and the X-Men. When the Hulk is able to destroy Onslaught's armor, however, the villain then exists as pure psionic energy. This results in many of the non-mutant superheroes sacrificing their lives by entering Onslaught's form, disrupting the villain from within and weakening it; enabling the X-Men to finally destroy Onslaught. In the aftermath of the battle, all the combatants are presumed dead except Franklin Richards, Nate Grey, Quicksilver, the Hulk (who was physically separated from his alter ego Bruce Banner during the fight), the Magneto clone known as Joseph, and the X-Men.
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Official Site: Marvel Comics
Links: Wikipedia: Onslaught Uncannyxmen.net: Onslaught Marvel.com: Onslaught