The story picks up after the events in Ultimatum and serves as a quasi-sequel/spin-off of Ultimate X-Men. Originally scheduled to be published bi-monthly, alternating months with Loeb's other Ultimate title Ultimate Comics: New Ultimates, X had long repeated delays, and became instead a prologue to Ultimate Comics: X-Men.
Derek Morgan: A young mutant from Chicago. He is able to fly by growing a pair of birdlike wings which can be retracted. When he grows his wings out, his eyes turn red, his fingernails grow into talons, and his canine teeth appear to become sharp.
Theodore "Teddy" Allan: Theodore "Teddy" Allan is the son of The Blob and brother of Liz Allen. He inherited his father's powers, such as his voracious super appetite and his extremely strong skin and layers of fat.