Talk about renewable energy! An entire city can be powered by the racket make by children when they scream... To that end an whole industry exists providing scary monsters to get the youngsters to bellow. A security breach sees their factory overrun by toddlers and boss "Waternoose" is terrified it will ruin the business. They all have to be rounded up by the pest controllers and returned home. Well, of course one "Boo" manages to avoid capture and she is soon befriended by the big wooly "Sully". His roar is terrifying, but his bark is certainly worse than his bite and together with his green ...