D.T. Messing has one problem! His 12-year-old sister, Raye. She likes to pull pranks on him or gets him into trouble. He has had enough. When he gets the chance to get her back, he can’t say no. Thanks to Monsters Unlimited, D.T. launches Operation: Rent-A-Monster. Jasspy arrives and a monster mess follows. Will D.T. get his revenge or will the monster mess be too big for him?