Filmography
| Role | Title | Year | Character |
|---|---|---|---|
| Writer | Over the Top | 1987 | |
| Writer | Flammendes Inferno | 1974 | |
| Writer | Der Unerbittliche | 1976 | |
| Writer | In der Hitze der Nacht | 1967 | |
| Writer | Die Höllenfahrt der Poseidon | 1972 | |
| Writer | Das Dorf der Verdammten | 1960 | |
| Producer | Shaft | 1971 | |
| Writer | Der tödliche Schwarm | 1978 | |
| Writer | Charly | 1968 | |
| Writer | Shaft in Afrika | 1973 | |
| Writer | Die Killer Elite | 1975 | |
| Writer | Telefon | 1977 | |
| Writer | Der Dritte im Hinterhalt | 1969 | |
| Writer | Der Tag, an dem die Welt unterging | 1980 | |
| Writer | Polizeirevier Los Angeles-Ost | 1972 | |
| Writer | Stimme am Telefon | 1965 | |
| Writer | Das Wiegenlied der Verdammten | 1971 | |
| Writer | Die Grasharfe | 1995 | |
| Writer | Wenn die Nacht anbricht | 1957 |