The film is set in the fictional Utah community of Santa Ynez, which is being terrorized by a mysterious black coupe that appears out of nowhere and begins running people down. After the car kills off the town's Sheriff, it becomes the job of Captain Wade Parent to stop the murderous driver.
Dr. Matthew Clark is the head of a state institution for intellectually disabled children. Jean Hansen, a former music teacher anxious to give her life some meaning, joins the staff of the hospital. Jean, who tries to shelter the children with her love, suspiciously regards Dr. Clark's stern training methods. She becomes emotionally involved with 12-year-old Reuben Widdicombe, who has been abandoned by his divorced parents.
Scientists surgically transform the Creature into an air-breather, but being able to live on land is not enough to make him comfortable with humans. Enraged, he turns his wrath on anyone who comes near as he desperately tries to return to the deep-water world where he truly belongs.
When a toy manufacturer feels ignored and unappreciated by his wife and children, he begins to rekindle a past love when a former employee comes back into his life.
