After an inquest determines that egotistical Jeff Ambler has committed suicide, six of his acquaintances, some of whom were financial backers of his art gallery, gather together, unconvinced by the ruling.

A band of satanist hippies roll into a town and begin terrorizing the local folk. They rape a local girl and her grandpa goes after them. He fails and is given LSD. This bothers his grandson and he gets back at the hippies by feeding them meat pies infected with blood from a rabid dog. They turn into crazed lunatics and begin killing and/or infecting everything in their path.