Ultimate X-Men / Fantastic Four #[nn]

This 2006 Marvel crossover collects the four-issue miniseries that brings together the Ultimate versions of the X-Men and the Fantastic Four. When a mysterious threat emerges from the Negative Zone, Reed Richards and Professor Xavier must unite their teams to confront a danger that challenges both their scientific and mutant abilities. The story highlights early interactions between iconic Ultimate characters like Johnny Storm, Ben Grimm, and the young X-Men, setting the stage for future team-ups in the Ultimate Universe.