General Parvo has a new crazed scheme! He wants to awaken a dinosaur family and use them to wreak havoc! He enlists the help of a band of Shiba Inu Cano-Mutant Ninjas. The Rovers must stop them from stealing artifacts that could lead to disaster, so they travel to Japan!

General Parvo's new plan is just letting his new breed of fighters destroy the world! The Road Rovers find themselves facing three mutant insects! They receive no help from Muzzle, who has fallen head-over-paws in love with Parvo's female rottweiler, Greta. Will they deal? Will Greta leave Parvo to join the RRs?

The Rovers' owners - the world leaders - are brainwashed into warring with one another because of an extra-terrestrial force! It is up to the Road Rovers to save them, and the whole world from nuclear war!