Pete Thelman was starting the third grade when the boys started the fourth. In the episode "Fourth Grade", they hit him for being a "stupid third-grader". In "Chef Goes Nanners", he was on the debating team with Stan and Kyle. In "Quest for Ratings", it was revealed that he urinates sitting down like a girl. Pete is also seen in "Raisins", when he is eating in the background, and in "Butterballs", where he is seen singing in Stan Marsh's anti-bullying video.
Pete wears a blue, hooded jacket with dark blue hemming and a red hat with a brown puff-ball and brown trimming. He has dark brown hair and large ears. He is short in stature compared to the other children. He can sometimes be seen wearing a brown shirt.
- "Chef Goes Nanners" - Seen on the debate team.
- "Fourth Grade" - The boys pick on him for being a third grader.
- "Cartmanland" - Seen having fun in the theme park.
- "Casa Bonita" - Seen eating dinner at Casa Bonita.
- "Raisins" - (cameo)
- "Quest for Ratings" - (mentioned only)
- "Tsst" - (cameo)
- "Super Fun Time" - Seen at "Super Phun Thyme".
- "Breast Cancer Show Ever" - (cameo)
- "1%"- Seen at the assembly.
- "Butterballs" - Seen in Stan's anti-bullying video.
- "Gluten Free Ebola" - Seen at The Boys' big party.