When 10-year-old Cark Reimer and his 8-year-old sister Carla knock on the front door of their new neighbor's house, hoping that they have children they can play with, they get something way better - when the door is opened by a man wearing the scariest, coolest monster mask! It turns out their neighbor, Mr. Neewollah (spell it backwards...), creates monsters for a movie studio, and when he invites Cark, Carla, and their parents to join him for a movie...