S1, E2: Acmetropolis is under the spell of the Fuz-Z, adorable and pliable living bio-pets. Everybody, including Duck and Lexi, wants one. But what nobody realizes, even Lexi who has come home with one, is that when the little cuties devour chocolate, they turn into huge, 10-foot tall, destructive creatures! The Loonatics race against time to stop this army of monsters from destroying the city and follow a trail to an embittered inventor fired from an Acmetropolis candy company, who is taking his revenge by using his genetically altered creations to give chocolate a bad name!