Like every kid in town, twelve-year-old Gabby has a pet monster. However, Gabby refuses to keep her monster, Dwight, in the cupboard. When she takes her pet to school, the drama teacher takes a liking to the beastly pet. He wants the monster to play Scrooge in the annual Christmas production. But if Dwight doesn't meet his expectations, both Gabby and her pet will be given the boot.