Thinking that his pet is lonely when he is at work, SpongeBob gets Gary a playmate. He gets it from a peddler, but she warns him about the pet's habit of terrorizing other animals. Ignoring the warning, he still buys the pet and calls it Puffy Fluffy. Whenever SpongeBob is not present, the new fish terrorizes Gary, and SpongeBob thinks Gary is being mean to the new pet as a result.