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!