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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.

Video Games[]

South Park: Phone Destroyer[]

Marcus appears in South Park: Phone Destroyer as a 4-Cost Epic Fighter of the Neutral theme. When he uses his Charge skill, he will throw a drug pillow at the enemy leader, making them take damage. All of his quotes are archived audio from "Hummels & Heroin".


  • 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.


South Park students
6th Grader Leader | 6th Grader with Black Hair and Blue Shirt | 6th Grader with Brown Hat | 6th Grader with Cyan Hat | 6th Grader with Dark Blue Shirt | 6th Grader with Green Shirt | 6th Grader with Orange Coat | 6th Grader with Yellow Shirt and Brown Pants | 9th Grader with Purple Shirt | 9th Grader with Red Hood | Alex Glick | Allie Nelson | Annie Knitts | Andrew Sutherland | Ashley | Baahir Hassan Abdul Hakeem | Bartles | Bebe Stevens | Beth | Betsy | Bill Allen | Billy Martin | Billy Miller | Billy Thompson | Blonde-Haired Girl | Bobby Palmer | Boy with Blond Hair | Boy with Brown Hair | Boy with Brown Hair and Red Shirt | Boy with C Cap | Boy with Dark Green Shirt and Glasses | Boy with Olive Shirt and Black Pants | Boy with Red Shirt | Boy with Red Shirt and Blue Pants | Bradley Biggle | Bridon Gueermo | Brimmy | Bully Girls | Butters Stotch | Casey Miller | Christophe | Clyde Donovan | Craig Tucker | Crippled Girl with Brown Hair | Chad Handler | Damien Thorn | David Rodriguez | DogPoo Petuski | Dougie O'Connell | Douglas | Emily | Eric Cartman | Esther | Firkle Smith | Filmore Anderson | Flora Larsen | Fosse McDonald | Francis | Francis (Special Ed) | Gary Harrison | Girl with Blonde Hair | Girl with Pink Coat | Girl with Brown Coat | Gordon Stoltski | Goth Kids | Gregory | Heather Williams | Heidi Turner | Henrietta Biggle | Ike Broflovski | Isla | Jake | Jason White | Jasper | Jenny Simons | Jessie | Jimmy Valmer | Josh Myers | Kal | Karen McCormick | Keifer | Kelly-Ann Barlow | Kelly and Stacy | Kelly Morris | Kelly P. Gardner | Kelly Pinkerton-Tinfurter | Kelly Rutherford-Menskin | Kenny McCormick | Kevin ("Summer Sucks") | Kevin McCormick | Kevin Stoley | Kindergartners | Kindergartner Girl with Brown Pigtails | Kindergartner with Cyan Hood | Kip Drordy | Kyle Broflovski | Larry Feegan | Larry Zewiski | Libby Perkins | Liza Nelson | Lizzy | Lola | Loogie | Louis | Leslie Meyers | Mandy | Marcus Preston | Maria Sanchez | Mark Cotswolds | Meagan Ridley | Michael | Michael (Special Ed) | Mike | Mike Cooper | Mike Makowski | Millie Larsen | Mimsy | Monica Ryland | Nancy | Nate | Nathan | Nelly | Nichole Daniels | Patty Nelson | Pete Melman | Pete | Pete Thelman | Peter Mullen | Pip Pirrip | Rebecca Cotswolds | Red McArthur | Sally Darson | Sally Turner | Samantha Dunskin | Sarah Peterson | Scott Malkinson | Scott Tenorman | Sef Furman | Shauna | Shelley Marsh | Sophie Gray | Stan Marsh | Tall Handicapped Boy with Blond Hair | Tall Handicapped Boy with Brown Hair | Tammy Nelson | Tammy Warner | Terrance Mephesto | Thad Jarvis | The 6th Graders | The 9th Graders | The Boys | The New Kid | The Ugly Kids | Theresa | Thomas | Timmy Burch | Tolkien Black | Trent Boyett | Tommy Edwards | Tommy Turner | Tweek Tweak | Wendy Testaburger | Yao

See also
List of Female 4th Graders | List of Male 4th Graders | Portal:Characters
Minor Characters from Season Twenty-One
Adam Borque | Alexa | Bill Yellow Hawk | Bob White | Chip Duncan | Crystal White | Dr. Gauche | 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