"Ultimate Fantastic Four" was the fifth continuing series of the Ultimate Marvel series, after "Ultimate Spider-Man", "Ultimate X-Men" and "The Ultimates" and "Ultimate Marvel Team-Up". The first writers assigned by project leader Bill Jemas were Mark Millar ("The Ultimates", "Ultimate X-Men") and Brian Michael Bendis ("Ultimate Spider-Man", "Ultimate X-Men"), who had both previously written comics in the Ultimate Marvel universe. Grant Morrison was involved in conceptualizing "Ultimate Fantastic Four" and was at one point set to write the series. However, he departed from Marvel for an exclusivity contract with DC Comics before this could be finalized. Bryan Hitch designed the costumes for the characters, thus explaining their aesthetic resemblance to the costumes worn by the protagonists of "The Ultimates".