Ransom 1988
Writer
Ten Violent Women 1982
Writer
The Thing with Two Heads 1972
Screenplay
The Incredible 2-Headed Transplant 1971
Writer
The Tormentors 1971
Writer
Bigfoot 1970
Screenplay
Scream Free! 1969
Screenplay
The Devil's Eight 1969
Screenplay
Hell's Belles 1969
Writer
The Young Animals 1968
Writer
The Mini-Skirt Mob 1968
Screenplay
The Glory Stompers 1967
Screenplay
From Manila with Love 2011
as Himself
American Grindhouse 2011
as Himself
The Hellcats 1968
Original Story
Credits from TMDB.