Chip and Dale are jealous of Gadget's attentions for Sparky, a spaced-out lab rat. Sparky and Buzz, a guinea pig, have been programmed to perform actions, such as running a maze without thinking, when triggered by specific sounds. Professor Nimnul is using them to rob banks. Buzz becomes the brain of a giant robot guinea pig, which runs to the bank through the city's sewers -- just like Buzz ran the laboratory maze. Chip and Dale deprogram Sparky and foil Nimnul's plans. Gadget assures them that their jealousy was groundless, they're the best at being Rescue Rangers.