As a penciler, Mooney did several issues of "Peter Parker, the Spectacular Spider-Man", as well as Spider-Man stories in "Marvel Team-Up", and he both penciled and inked issues of writer Steve Gerber's "Man-Thing" and the entire 10-issue run of Gerber's cult-hit "Omega the Unknown", among many other titles. Mooney named his collaborations with Gerber as being among his personal favorites. In 2010, Comics Bulletin ranked Gerber and Mooney's run on "Omega the Unknown" tenth on its list of the "Top 10 1970s Marvels". Carrion debuted in "The Spectacular Spider-Man" #25 (Dec. 1978) by Bill Mantlo and Mooney. Writer Ralph Macchio and Mooney introduced the in "The Spectacular Spider-Man Annual" #2 (1980).