Demonwarp

Demonwarp is a 1988 American science-fiction horror film directed by Emmett Alston and starring George Kennedy.
Plot.
The film begins with Bill Crafton talking to his daughter inside their cabin. Suddenly a Bigfoot-like being breaks in and takes away the girl. Some teenage campers arrive and they too eventually meet the Bigfoot, with many of them being killed or captured. It is later discovered that one of the campers came there to find his uncle. His uncle is later found to be the Bigfoot, and that a bigoted Catholic priest used him for his own evil plans. Actually, the priest thinks an alien who arrived from an unknown planet 100 years ago is an angel who is here to be served by him. After unearthing such alien conspiracy and a horde of mindless zombies, the hidden spacecraft is destroyed inside the cave they used to hide it.
Production.
Rick Albert and executive producer Mark Amin decided that their first film production should be a genre film, using as many special effects and monsters as the small $250,000 budget could support. To save costs, Rick Albert recruited many of his friends, who were lawyers, to appropriately play the army of zombies. The film was edited on a Moviola using 35 mm film.
The film was produced by Richard L. Albert through his motion picture design and marketing firm, Design Projects Inc.. Financing was provided by the individual owners of Trimark Pictures which was then called Vidmark.
The film was shot mostly in Topanga Canyon in Los Angeles, with the final scene shot at Bronson Caves in Griffith Park.