Abbot Costello is in charge of Felonious Abbey, found not far from Dunwyn. Tummi is accidentally accepted as a friar as he tries to learn when to say no. The trolls find three disguises, which belong to Costello's Friars. The trolls use them to get free money. Tummi and Costello stop them with the help of food.
- Abbot Costello is named for Abbott and Costello.