Unknown by some is the fact that this film is not one of the big studio films that the director is noted for, but actually a personal project. Director William Malone (House on Haunted Hill) wrote this while he was working on his Masters of Horror episode "Fair-Haired Child". He was so taken with the concept that he decided to just make it, rather than taking the usual studio route. He apparently broke the first rule of filmmaking, which is "Never finance your own movies." One of his friends and he refinanced their houses to fund the project. Interestingly, there is another connection to his MOH episode in that one of the creatures in the film is an unused design from that show. Malone actually built the creature himself for the film. Also, Malone's High School Garage Band, The Plagues, can be heard on the soundtrack, along with other garage bands from the 1960s.