The theme of religious fanatics who live in complete isolation and consider any contact with the outside world "contamination" has been done to death in the horror genre, but here they give it another go. Apparently they decided that wasn't enough, so they also threw in the "adults-behaving-as-kids" theme, which also has been done before (check out the REALLY twisted 1973 film "The Baby"). The result is a campy, silly, demented and thoroughly unpleasant horror film, but the production is fairly polished, the direction is competent and Rod Steiger gives a deliciously embarrassing performance as "Pa" (what the hell was he thinking when he decided to sign on for such a movie?) (**)