Five high-spirited young friends rely on their vivid imaginations to embark on amazing adventures. Robin Hood the clean (Pablo) sets out to free the villagers of Filthingham from the rule of Mayor Austin Stinkypants. Musketeers Pablo and Tyrone escape the clutches of the Empress and receive help from a stranger who also wants to be a musketeer. Librarian Uniqua turns into the Masked Retriever to get back an overdue library book from Don Austin. Professors Pablo and Uniqua use their inventions to take Tyrone to the center of the Earth to retrieve his lucky penny.