Peter just won a turtle at his friend Jimmy's birthday party. He names the turtle Dribble. Peter introduces his family and the concepts of his annoying brother Fudge and his habits. Fudge annoys his father’s business clients culminating in plastering the client's suitcase with stamps, prompting them to remove their account from the company. Fudge refuses to eat, pretending he is the family dog and wanting to eat off the floor. Dad's patience is broken and he dumps a bowl of cornflakes over Fudge's head, leading to Fudge's new favorite phrase, "Eat it or wear it!". While being watched by Sheila Tubman on the playground, Fudge jumps off the jungle gym, thinking he can fly, crashing to the ground and swallowing his top two front teeth in the process, and Peter almost immediately gives Fudge a new nickname, Fang, which is unamusing to his mother. Peter is recruited by his mother to chaperone Fudge's birthday party, which ends up with some amusing and disastrous moments. Then Mom takes the kids to some errands. First she takes Fudge to the dentist to check on how his teeth are progressing after the accident. Then Fudge makes a spectacle of himself at the shoe store, since he wants to buy loafers like Peter is getting. Mom reaches her breaking point when Fudge decides to smear mashed potatoes on the wall of a restaurant and dump peas over his head. Peter and Jimmy Fargo and Sheila are grouped for a class project and are constantly arguing over it, but Fudge makes the situation more difficult by scribbling on their piece of project work. Fudge is spanked when his mom finds out. Then when the project is finally finished, Fudge cuts off his hair (as he fancies himself a certified barber) and their father gets a lock for Peter's door. Mom goes out of town to visit her sister in Boston. Dad takes his sons into work when coincidently Fudge stars in an advertisement on television that Dad wrote. All hell breaks loose when Fudge is taken to the movie theater and makes a spectacle of himself, almost getting lost. Then Dad cooks a rather nasty-tasting mushroom omlette, which Fudge enjoys and then throws a tantrum when Dad throws it away. Then Fudge swallows Peter's pet turtle, resulting in hospitalization, and Peter's parents get him a dog to apologize about only giving attention to Fudge and not caring about the lost Dribble. Peter gets a new dog which he names Turtle "To remember".

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