4 issue limited series. Subtitle on covers is: "The True Story of Comics' Greatest Foursome". Issues #2 and #3 have the title as just "Unstable Molecules" listed in their indicia. Marvel Rating on Covers: PG+ Mature Content. Third project in Marvel's sub-imprint "Startling Stories".
The series doesn't feature the Fantastic Four, rather it's a fictional biography of the fictional neighbours who would have been the models for the Fantastic Four.