Eight-year-old Michael has lost his father, and his mother has thrown herself into work to avoid her grief. For his birthday tradition, Michael heads to the theme park accompanied only by his imaginary friend, a gorilla named Jam, and they embark on exciting adventures. By the time Michael's mother realizes that her son is missing, he has been seriously injured by the park's violent elephant. However, the accident causes Michael and his mother learn to come to terms with Michael's father's death.
