The Sixth-graders are a group of older students who tend to bully the fourth-graders. They are usually seen riding their bicycles. They were originally depicted as fifth graders, but moved to sixth grade in the fourth season. Their leader is a boy with a distinctive haircut who is always depicted wearing a shirt with a logo of his own face. He regularly refers to the fourth-graders disparagingly as "Fourthies". Episodes concerning the sixth-graders' interactions with the main characters have become less frequent in later seasons.
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