Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Writer | Conan the Destroyer | 1984 | |
| Writer | Damien: Omen II | 1978 | |
| Writer | Firestarter | 1984 | |
| Writer | Eye of the Needle | 1981 | |
| Producer | Theatre of Blood | 1973 | |
| Actor | Meteor | 1979 | |
| Writer | Meteor | 1979 | |
| Writer | The Mouse That Roared | 1959 | |
| Writer | Woman of Straw | 1964 | |
| Writer | A High Wind in Jamaica | 1965 |