The character debuted in Peter Cannon ... Thunderbolt #1 (Jan. 1966), part of Charlton editor Dick Giordano's "Action Heroes" superhero line. The series then took over the numbering of the defunct title Son of Vulcan, and ran from issue #50–60 (March/April 1966 – November 1967), after which Morisi, a New York City Police Department officer and time-pressed with police work, left the title, which was canceled along with the rest of Charlton's "Action Heroes" comics line. As a police officer, Morisi signed his work with his initials, PAM, in order to keep his moonlighting hidden.