Bill Whitney lives with his parents and sister in a mansion in Beverly Hills, California. Despite their wealth, Bill tells his therapist Dr. Cleveland that he doesn't trust his high-society family. When his sister`s ex-boyfriend Blanchard gives him a surreptitiously recorded tape of what sounds like his family engaged in a murderous orgy, Bill begins to suspect that his feelings are justified. Bill gives the tape to Dr. Cleveland, but when he later plays it back, the audio has changed to his sister's coming out party. When Bill arrives at home, he confronts his family again, but with Dr. Cleveland's help, they drug Bill. Dr. Cleveland reveals that Bill's family and their high-society friends are actually a different species from Bill. The wealthy party guests strip to their underwear and begin "shunting" - physically deforming and melding with each other - as they suck the nutrients out of Blanchard's body. Their intention is to do the same to Bill, but he escapes and runs around the house, finding his family engaged in similarly disgusting activities as he does.
