"Contains material originally published in magazine form as Fantastic Four/ X-Men, Ultimate X-Men/Fantastic Four, and Official Handbook of the Ultimate Marvel Universe #1-2"--Cover p. [2].
Summary
When Cerebro is stolen from Xavier institute while the X-Men and Professor X are out, all evidence points to the Fantastic Four as the thieves. Includes in-depth bios of the Ultimate X-Men, the Ultimate Fantastic Four, the Ultimates, and Ultimate Spider-Man characters.