By now, however, the rates were closer, and Mooney left DC. Marvel editor Stan Lee had him work with "The Amazing Spider-Man" penciler John Romita. Mooney first worked on Spider-Man by inking "The Spectacular Spider-Man" magazine's two issues. Mooney would go on to ink a run of "Amazing Spider-Man" (#65, 67-88; Oct. 1968, Dec. 1968 - Sept. 1970), which he recalled as "finalising it over John’s layouts". Among the new characters introduced during Mooney's run on the title were Randy Robertson as a member of the supporting cast in issue #67 (Dec. 1968) and the Prowler in #78 (Nov. 1969). Mooney also embellished John Buscema's pencils on many issues of "The Mighty Thor".