Judge Reinhold is divorced and sometimes he has to take care of his son Fred Savage. On his way home from a business trip, he accidentally got a decorative skull without knowing that the skull had some kind of magic. One day, father and son prayed at the same time that they could become each other's age, and the magic immediately took effect. The identities of father and son immediately switched, and the father and son occupied each other's bodies, so the son had to go to work in the company and had to deal with his father's girlfriend. Dad had to go to school. In the process of changing roles, father and son realized each other's situation and enhanced the father-son relationship.