The Day the World Ended

This film finds an alien, who is misunderstood, bent on hunting down and devouring people. A school psychologist, Dr Jennifer Stillman (Nastassja Kinski) investigates the death of a student's mother and finds that the boy (Bobby Edner) believes he is the son of the being. His earthling father (Randy Quaid) is also a doctor, who has the boy in his care and holds that it is all in the boy's imagination.