Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Writer | The Punisher | 2004 | |
| Writer | Conan il distruttore | 1984 | |
| Writer | Punisher - Zona di guerra | 2008 | |
| Writer | Fire and Ice - Fuoco e ghiaccio | 1983 | |
| Actor | Marvel: 75 Years, From Pulp to Pop! | 2014 | Himself |
| Writer | The Green Goblin's Last Stand | 1992 | |
| Writer | A Perry Mason Mystery: The Case of the Jealous Jokester | 1995 | |
| Crew | Perry Mason: Elisir di morte | 1993 | |
| Writer | Perry Mason: The Case of the Killer Kiss | 1993 |