The film follows Vietnam veteran Herschell (Steve Hawkes), who whilst riding down the highway on his motorbike, helps a young religious girl called Angel (Heather Hughes), whose car has broken down. She takes Herschell back to her home, where her sister, Anne (Dana Cullivan) and many local friends of hers are smoking drugs. Herschell refuses to take any drugs, as Angel had warned him about them, however, Anne continues attempting to seduce him. Angel decides that Herschell should stay with them until he gets back on his feet in life. Whilst cleaning the girls' pool, Anne encourages Herschell to smoke a joint; he does, and finds himself addicted.

Herschell gets a job at a local Turkey farm, where he meets two scientists who are experimenting by testing certain chemicals on turkey meat. Herschell agrees to participate in a test by eating some of the turkey meat; to convince him to agree, the scientists bribe him with more marijuana. After eating the whole turkey, he passes out on the farm. He suffers a seizure and the two scientists later find him, and worried about being investigated about the possible death of Herschell, they dump his body in the woodlands. But Herschell is not dead -- he wakes up to find he has a giant turkey's head in place of his own head. He is also still addicted to drugs, but instead of smoking marijuana, he now craves the blood of other addicts.