The gang goes on a Hollywood tour of Bananatoon Studios, where Scrappy's favorite cartoon, Hero Hound, is created. While there they run into a mystery and are hired by Buster Banana, the studio head, to find out why the evil Monster Mutt is stealing all the films in the studio. / The kids head over to the Experimental Institute for Evolutionary Improvement of Organisms, also know as E.I.E.I.O., to help old Mr. MacDonald, the director, discover who is creating monsters with the secret formula that he developed to create large amounts of food.