The gang's plane, heading for Puerto Rico, makes an emergency landing in a Caribbean jungle inhabited by dinosaurs and bipedal apes, all of which are under the control of a mad scientist named Dr. Madro, who can change humans into animals. Alexander is turned into a chicken and then an ape, while Sebastian the cat is turned into a bulldog! Loosely based on "The Island of Doctor Moreau" and "The Planet of the Apes" movie series