Episode 1: Cheesecago: City Without Law Al Catone, the evil behind all of Cheesecago's shady business dealings, is not pleased as the best agents of the Federal Mousehole of Investigation, Elliot Mouse, Gordon and Mr. Wilson, have arrived in town. He tries to bump them off while they visit the cities sites and local characters, such as the Cheese Pare, and the beautiful singer Deborah.
Episode 2: Moony's Big Haul After their eventful arrival in Cheesecago, Elliot Mouse, Gordon and Mr. Wilson find some little guys who take cheese from one of Catone's warehouses. Elliot convinces them to lead him to the warehouse and to prove to the city that Catone can be combated. With the fantastically equipped car Armstrong 326, the Untouchables are born.
Episode 3: The First Raids Elliot Mouse and the Untouchables try to bring Al Catone's criminal empire down by dealing a hard blow to his main source of income: contraband cheese. The success of their intervention encourages the citizens of Cheesecago to provide the Agents with information on Catone's illegal warehouses. But the evil mobster gets an idea on how to thwart the Untouchables' plans..