Wrath of the Librarian

Courage finds a two-year overdue book. When he decides to return it, he does not have enough money for the $10,000 fee. Courage rushes back home to seek the help of his owners. However, he realizes too late that the librarian has deliberately cast a spell on the book, which Muriel and Eustace unknowingly touch, turning them into its characters until Courage finds enough money to pay the fee.