X-Man (Nathaniel "Nate" Grey) is a fictional character, a superhero in the Marvel Comics Universe and related to the X-Men franchise. Created by Jeph Loeb and Steve Skroce, he first appeared in X-Man #1 (March 1995).
X-Man is an equivalent of the regular Marvel Universe hero Cable, hailing from the “Age of Apocalypse” reality. He is the biological son of his dimension’s Scott Summers and Jean Grey, born of genetic tampering by the villain Mr. Sinister. Due to a childhood infection, however, Cable never achieved the vast telepathic and telekinetic powers of X-Man while Nate Grey was one of the most powerful mutants in existence during his lifetime.