When the shocking secret of the origin of the world's mutants comes to light, it comes as a surprise to the members of the X-Men, who are running from citizen unrest, government persecution, and a former teammate now looking to destroy them. Quicksilver's plan for world domination goes awry, Jean Grey's identity is revealed, and the mutants interned at Camp Angel begin to revolt when they learn about the origin of the X gene.

"Contains material originally published in magazine form as Ultimate comics X-Men"-- T.p. verso.