When the kitten Binou accidentally soils his favorite doggie, Mr. Mou, the mouse Toupie (Marc Labrèche) calls on Dorothée (Anne Dorval), a cow living in a magic lamp, to get rid of the stain. However, because of a misunderstanding, it is the whole doggie that disappears. Toopy, Binoo and Dorothy must therefore go to the World of Lost Objects to find the precious stuffed animal….