When their class tadpoles are big enough, Mr. Stricter tells his students they can keep . The class chooses Bruno, the smallest of the bunch. But Bruno doesn't stay that way for long. Soon, he's grown into a giant, classroom-wrecking creature: he eats desks, he farts for show-and-tell, and he sneezes slime all over everything! With Mr. Stricter blinded by love for the pet, the students must step up and take matters into their own heroic hands.