Construction workers building an airstrip on a small Pacific Island during WWII encounter an ancient meteor. Then they are terrorized when some strange spirit-like being takes over a large bulldozer, and goes on a killing rampage.
Norman Bates is again released from the mental hospital he was placed in at the end of Psycho III after serving another few years and is apparently rehabiliated for the second time. Norman is now married to a young nurse named Connie and is expecting a child. However, Norman fears that the child will inherit his mental illness. Meanwhile, Fran Ambrose is a radio talk show host who is discussing the topic of matricide with guest Dr. Richmond, Norman's former psychologist. The radio station receives a call from Norman, who uses the alias "Ed" to tell his story.