Professor Firble has a novel approach to running the Ultrapolis zoo, he ensures all the animals feel useful, giving them each a little job to do and letting them roam free when the zoo is closed. This prevents them getting bored and suppresses their natural aggression. Unfortunately, Cosmo Peterson, the zoo owner, has decided to transform the zoo into a theme park, Savageland, full of wild and ferocious animals. Professor Firble refuses to treat the animals in such a fashion, so Cosmo employs an ex-marine, Alfred Pusey, in his stead. Can Pigeon Boy and Professor Firble convince Cosmo Peterson to leave the zoo as it is?