Known superhuman powers: Nate Grey is a mutant possessing vast psionic abilities. Nate has so far shown telekinetic ability almost rivaling that of Phoenix, creating destructive psionic spikes, and lifting objects of at least 10 tons or more. Nate is also a telepath of the first order, able to create psionic illusions, read, probe and control the minds of others, and to pull a psionic entity out of the astral plane. It is possible that, with practice, Nate Grey could be the most powerful psionic on the planet.

Sinister, realizing the damage that would occur if Apocalypse continued his reign, found and killed Forge. Sinister revealed to Nate who Nate was and why he was created: to destroy Apocalypse. In his grief over Forge's death, Nate lashed out with his psionic powers and killed Sinister. He then journeyed to Apocalypse's Citadel, located in what once was New York City. Nate found the X-Men, led in this timeline by Magneto, and helped them in their assault on the Citadel.

During the attack, Nate battled Holocaust by himself. Nate, in an attempt to breach Holocaust's armor, stabbed him with a shard of the recently recovered M'Krann Crystal, and both Nate and Holocaust vanished.

Through the powers of the M'Krann Crystal, Nate was transported to our Earth, landing in the Alps. When he first landed, his subconscious need for companionship recreated a physical body for the dissipated essence of the then-deceased Madelyne Pryor. Nate and Madelyne, who became fast friends, journeyed through Europe until Pryor was convinced to leave Nate by Selene, who wanted Pryor as a member of the newly reformed Inner Circle of the Hellfire Club.

After leaving Europe, Nate encountered McCoy, a twisted version of Hank McCoy from the timeline from which Nate originally hailed McCoy told Nate that he recognized Sinister's work, and explained that Sinister would not have created someone so powerful without a fail-safe. McCoy claimed that Nate's existence was to end the moment he accomplished his mission (to destroy Apocalypse), and Sinister designed Nate's psionic powers to kill him within a few years. To investigate this claim, Nate traveled to Muir Island, where Dr. Moira MacTaggert confirmed the diagnosis: his powers could indeed kill him before he turned twenty-one.

After this revelation, Professor Charles Xavier subjected Nate's mind to a probe. Sensing evil (the part of Xavier's psyche that would eventually break from Xavier and become the entity known as Onslaught), Nate lashed out with his powers and pulled Xavier's psyche from the astral plane.

Soon after that encounter, Nate saved the mutant Threnody, who was fleeing clones of the original Marauders, and the two began to travel together, finally settling in New York City.

Madelyne Pryor, who was now a member of the Hellfire Club, returned to find Nate, since she felt a connection. Pryor encountered and killed Threnody, and discovered that she (Pryor) had been reconstructed by Nate, later becoming independent of him. Pryor was felled by the combined effort of Nate and Phoenix, the Jean Grey of this timeline.

Though Nate continued to associate with the x-men at this time, his popularity in New york was rapidly on the rise. He began to spend more and more time there, protecting the people of that city, and working to keep the streets safe. It turns out however, that his popularity was being artificially manipulated by the Purple man, a fact which came to light when Nate foiled an attempt to blow up Madison square garden. In an attempt to check that the terrorists weren't carrying any more explosives, he mind scanned them. Unfortunately, unknown to the terrorists, one of them had a subdermal bomb implanted into his head, a bomb which exploded when Nate scanned the mans mind, killing a great many people and destroying the police station.

Having learned of the Purple Man's powers, Nate was now able to filter out the effects and take control of himself. However in the ensuing battle between the two men, a city block was leveled. At the end of it all, Nate realised that the purple man had so badly damaged the people of New York, influencing their minds and controlling their thoughts, that with his influence gone, they were turning the other way, striking out with hatred and fear at those they perceived to be mutants. What was worse, the news of the events would soon spread around the world, creating a backlash of mutant hatred that might bring to this world the events that had occured in his own.

Still battered and beaten from the fight, and knowing that the only answer was to change reality on a fundamental level, by changing peoples memories, Nate went to the Brooklyn bridge, where he called on the power of the astral plane, and erased all memory of him from the world. Though the world still remembered some of the events that had occured, specifically that the Purple man had attempted to control them, but had been stopped, no-one remembered that they had once known of, and loved Nate Grey, and that they had not been manipulated into loving, then hating Nate Grey, nor did those friends of Nate's that had been caught up in the events have any knowledge of the cruel way the Purple Man had manipulated them.

Nate faded into the background, still doing the right thing in New York, though acting from a distance, using his powers to save others without needing to go anywhere near them, without anyone needing to know he existed. Though some might say that Nate didn't really need to erase the worlds memory of him, that the people would recover, Nate chose not to take the chance that this world might go the way of his own.