Charles Xavier is
perhaps the world's most powerful mutant, and a strong believer that humans
and mutants can live together in peace despite their differences. In his
early adulthood, he had been friends with Magneto, but the two parted when
they had a serious argument about their respective philosophies. Xavier
went on to form the X-Men, a group of teenage mutants who fought to preserve
his dream. Xavier was an inspiration to mutants and non-mutants alike,
but even the strongest individuals can succumb to weakness.
of enmity with Magneto, Xavier
had seen his old friend slaughter too often. When Magneto ripped Wolverine's
adamantium skeleton out of his body, Xavier had seen enough, and thus completely
wiped his adversary's memory. Although Magneto later recovered, the incident
would come back to haunt Xavier in more ways than one. His contact with
Magneto's mind caused the dark side of his psyche to grow, and it eventually
manifested itself as the massively powerful psionic entity known as Onslaught.
The malevolent creature was the power of Charles Xavier combined with the
amplified villainy of Magneto. Onslaught terrorized Earth in a way even
Apocalypse had not done, and it took the sacrifice of a great many heroes
to stop him. Now, Onslaught is back, and he is prepared to meet the combined
forces of the superheroes once again.