Arthur worries that Buster will be too sophisticated for him after traveling around the world; Buster finds that a few things have changed while he was gone.

D.W. steals a green potato chip and to prank her, Arthur tells her that green chips are poisonous. She believes it, and worse yet, her mother starts telling everybody. With help from Binky, can D.W. learn to rise above the embarrassment?

Francine gets a new cat whom she names "Nemo", but Arthur insists that cats are stupid, evil, and smelly - much to the expense of their friendship.