Objective: The science fiction film "Invaders From Mars" is used to teach principles of child development; clinical features of separation anxiety and nightmares; and clinical interventions, including child psychotherapy, child protective issues, and crisis management. Methods: Commercial films have been used as teaching aids in child psychiatry seminars. In this child psychiatry seminar, "Invaders From Mars" is viewed, and relevant teaching points are discussed with child psychiatry residents. Results: The response of child psychiatry residents has been positive, with high ratings. Conclusion: This film may serve as a useful tool for teaching child psychiatry residents principles of child development, clinical features of separation anxiety and nightmares, and basic clinical interventions.