| Squadra volante | 1974 | Screenplay |
| L'uomo della strada fa giustizia | 1975 | Screenplay |
| Un flic voit rouge | 1975 | Screenplay |
| Marc La Gâchette | 1975 | Screenplay |
| Le Truand Sort De Sa Planque | 1976 | Writer |
| Brigade spéciale | 1976 | Writer |
| Brigade spéciale | 1976 | Screenplay |
| Agent très spécial 44 | 1976 | Writer |
| Magnum 44 spécial | 1976 | Screenplay |
| Le Cynique, l'infâme, le violent | 1977 | Screenplay |
| L'Exécuteur vous salue bien | 1977 | Writer |
| Équipe spéciale | 1977 | Screenplay |
| Calibre magnum pour l'inspecteur | 1977 | Screenplay |
| L'Emmurée vivante | 1977 | Screenplay |
| Les démons de la nuit | 1977 | Screenplay |
| Pardon...Vous ĂŞtes normal | 1979 | Screenplay |
| Pulsions cannibales | 1980 | Screenplay |
| HĂ©ros d'Apocalypse | 1980 | Screenplay |
| Frayeurs | 1980 | Screenplay |
| La cameriera seduce i villeggianti | 1980 | Writer |
| L'Au-delĂ | 1981 | Screenplay |
| La Maison près du cimetière | 1981 | Screenplay |
| Pierino il fichissimo | 1981 | Writer |
| Pierino la peste alla riscossa | 1982 | Screenplay |
| L'Éventreur de New-York | 1982 | Screenplay |
| Due gocce d'acqua salata | 1982 | Writer |
| La Malédiction du pharaon | 1982 | Screenplay |
| Les Guerriers du Bronx | 1982 | Screenplay |
| Amityville II : Le Possédé | 1982 | Writer |
| Ironmaster - la guerre du fer | 1983 | Screenplay |
| La maison de la terreur | 1983 | Writer |
| Les Exterminateurs de l'an 3000 | 1983 | Writer |
| Tonnerre | 1983 | Screenplay |
| 2072, les mercenaires du futur | 1984 | Screenplay |
| Impatto mortale | 1984 | Writer |
| Le monstre de l'océan rouge | 1984 | Screenplay |
| Amazonia : la jungle blanche | 1985 | Screenplay |
| DĂ©mons | 1985 | Screenplay |
| Morirai a mezzanotte | 1986 | Screenplay |
| DĂ©mons 2 | 1986 | Writer |
| Camping del terrore | 1986 | Screenplay |
| Thunder II | 1987 | Screenplay |
| Spettri | 1987 | Screenplay |
| Karaté Warrior | 1987 | Writer |
| Delta Force Commando | 1987 | Writer |
| Colpo di stato | 1987 | Screenplay |
| Ratman | 1988 | Screenplay |
| Thunder III | 1988 | Screenplay |
| Bye Bye Vietnam | 1988 | Writer |
| Il ragazzo dal kimono d'oro 2 | 1988 | Writer |
| I predatori della pietra magica | 1988 | Writer |
| CY-Warrior | 1989 | Writer |
| L'ultimo bus di guerra | 1989 | Writer |
| I ragazzi del 42° plotone | 1989 | Writer |
| Killer Crocodile | 1989 | Screenplay |
| Soldier of Fortune | 1990 | Writer |
| Killer Crocodile 2 | 1990 | Screenplay |
| Alibi perfetto | 1992 | Screenplay |
| L'angelo con la pistola | 1992 | Screenplay |
| Alex L'Ariete | 2000 | Screenplay |
| Alex L'Ariete | 2000 | Writer |
| Il sangue dei vinti | 2008 | Screenplay |
| Bastardi | 2008 | Screenplay |
| Roma nuda | 2011 | Writer |
| Tulpa | 2012 | Screenplay |
| La madre | 2013 | Screenplay |
