- 1996The Shadow of the PharaohFilmWriter
- 1992Beyond JusticeFilmStory, Screenplay
- 1991The Law of the DesertSeriesWriter
- 1985Christopher ColumbusSeriesScreenplay, Writer
- 1980Flatfoot in EgyptFilmScreenplay, Story
- 1979The HumanoidFilmWriter, Story
- 1978Flatfoot in AfricaFilmScreenplay
- 1978Silver SaddleFilmScreenplay, Story
- 1978Emanuelle - A Woman from a Hot CountryFilmWriter
- 1977Puttana Galera!FilmWriter
- 1975The Killer Must Kill AgainFilmDialogue
- 1975Reflections in BlackFilmScreenplay
- 1975Blood, Sweat and FearFilmWriter
- 1975Death RiteFilmScreenplay
- 1974Emergency SquadFilmScreenplay
- 1974Kiss of a Dead WomanFilmScreenplay
- 1974KidnapFilmWriter
- 1973The CounsellorFilmScreenplay
- 1972Your Vice Is a Locked Room and Only I Have the KeyFilmScreenplay
- 1972Sonny and JedFilmScreenplay
- 1972The Killer Is on the PhoneFilmWriter
- 1972The BoxerFilmWriter
- 1972Trinity and Sartana Are ComingFilmStory, Screenplay
- 1972Alleluja & Sartana Are Sons... Sons of GodFilmWriter
- 1972Man Called AmenFilmWriter
- 1971Shoot the Living and Pray for the DeadFilmWriter
- 1971The Man with Icy EyesFilmWriter
- 1971The Last TraitorFilmScreenplay
- 1970The Night of the AssassinFilmDirector, Writer
- 1969The Legion of No ReturnFilmWriter
- 1969A Place In HellFilmWriter
- 1969The Fourth WallFilmDirector, Screenplay
- 1968The MercenaryFilmCo-Writer
- 1968Bloody Che ContraFilmWriter, Story
- 1968Five Days in SinaiFilmScreenplay
- 1968Hole in the ForeheadFilmStory, Screenplay
- 1967Kill and PrayFilmScreenplay
- 1967Avenger XFilmStory, Script
- 1967Pecos Cleans UpFilmScreenplay
- 1967Crónica de nueve mesesFilmStory
- 1967The CobraFilmScreenplay, Story
- 1967Death Rides AlongFilmScreenplay
- 1966My Name Is PecosFilmWriter
- 1966Ringo and His Golden PistolFilmScreenplay, Story
- 1966The Battle of the ModsFilmScreenplay
- 1965Spy in Your EyeFilmWriter
- 1965Man from Canyon CityFilmWriter
- 1964A Fistful of DollarsFilmScreenstory
- 1964Minnesota ClayFilmStory, Screenplay
- 1964A Very Handy ManFilmWriter
- 1963The Tyrant of CastileFilmWriter
- 1963Brennus, Enemy of RomeFilmWriter
- 1963Slave Girls of ShebaFilmScreenplay
- 1962The SlaveFilmStory, Screenplay
- 1962Mondo sulle spiaggeFilmWriter
- 1961Romulus and RemusFilmDialogue
- 1960Italiani all'infernoFilmWriter
- 1952La peccatrice dell'isolaFilmScreenplay
- 1949I contrabbandieri del mareFilmWriter