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Marcus Preston is a 4th-grade student at South Park Elementary who appears in the Season Twenty-One episode "Hummels & Heroin".


Marcus played a major role in "Hummels & Heroin", where he investigates the sudden deaths of entertainers dressed as popular cartoon characters. At his own 10th birthday party, he witnessed Chuck E. Cheese fatally overdose on opioid drugs while performing on stage. This traumatizing event led him to call a rally and declare war on opioids at the school.


Marcus is a short, chubby 4th Grader. He has curly black hair that is cut low on the sides and high on the top. He dresses professionally and acts mature for his age. He can be seen sporting a green jacket, a brown v-neck sweater with a horizontal argyle print, and dark blue slacks. He also has a very distinct voice, speaking forcefully at a high pitch.


Marcus proves himself to be sentimental, astute, and ambitious. He took measures into his own hands to uncover the drug network responsible for the death of Chuck E. Cheese and the other costumed characters. He persevered in his investigation, seeking to bring justice to all responsible parties. Using his impeccable investigative skills and logic, he followed-up on every promising lead, eventually leading him to the truth behind all the untimely deaths of these beloved cartoon characters.

Though Marcus appears quite abrasive and intimidating on the surface, he is also very sensitive. After all, his investigation was primarily fueled by his own admiration for Chuck E. Cheese and the other entertainers. He burst into tears while speaking to Stan about his feelings about their deaths at the end of the episode. Despite his mature discourse and sophisticated analytical skills, Marcus is still a child (physically, psychologically, mentally, and emotionally). He genuinely believed that each of the costumed entertainers in fact was the actual cartoon characters that they represented.


  • His original design had glasses.
  • He is voiced by guest star Josh Gad, an American actor, fan of the series, and friend of Trey Parker and Matt Stone. He had previously been the original actor for Elder Arnold Cunningham in The Book of Mormon, which Parker and Stone co-wrote with Robert Lopez.


Minor Characters from Season Twenty-One
Adam Borque | Alexa | Bill Yellow Hawk | Bob White | Chip Duncan | Crystal White | Gary Borkovec | Hannah Williams | Heather Conduct | Henry Kline | Jim Bob | Justin Trudeau | Kelly Morris | Kim Jong-un | Marcus Preston | Mark Zuckerberg | Mike Pence | Mitch McConnell | Mrs. White | Park County Courthouse Judge | Paul Ryan | Peter Galtman | Tucker Rae | Wilson Aubry

More information: Season Twenty-One | List of Minor Characters from Season Twenty-One