In "Korn's Groovy Pirate Ghost Mystery", he first appears with Alan the security guard as watchmen of Mt. Peaceful Cemetery. They warn South Park about Cleo Broflovski's stolen corpse, saying that it had been stolen for the purpose of having sex with it. Unbeknownst to them, the boys had dug it up to scare the 6th Graders. In addition to warning the townsfolk about the stolen body, he and Alan also go into graphic detail of what necrophilia is and how it is performed.
In "Trapper Keeper", he and Alan are stationed at Cheyenne Mountain's military base. He and many others think that Cartman's trapper keeper is the nicest thing they have ever seen. When he is about to report the giant blob, which is Cartman, he is grabbed by it and pulled into the blob. When the blob is destroyed he wasn't shown to come out but it's possible that he survived.
Mark wears a dark blue security guard's uniform which consists of a collared shirt, a black tie, a black belt with a gold buckle, pants, and black shoes. He has brown hair and wears a dark blue cap.
- ""South Park" Trapper Keeper (TV episode 2000)". IMDb.com.
|Minor characters from Season Three|
|Alan the security guard | Anchorman | Boy with dark green shirt and glasses | Cleo Broflovski | Costa Rican President | Deejay | Dio | Doctor Lout | DOI agents | Dr. Spookalot | Emperor Hirohito | Foreman | Garth | Genghis Khan | Getting Gay With Kids | God | Haman | Helen | Herbert Garrison Sr. | Jake | Jakovasaur | Jew Scouts | Kelly | Kenny G | Korn | Mailman | Mark Cotswolds | Mark the security guard | Marklar | Moses | Mr. Adler's girlfriend | Mr. Cotswolds | Mr. Derp | Herbert Garrison Sr.'s drinking buddies | Mrs. Cotswolds | Mrs. Garrison Senior | Ms. Stevens | New York kids | Nibblet | Nurse with red hair | Pablo | Pearl | Peetie the Sexual Harassment Panda | People's Army leader | People's Army soldiers | Pirate Ghosts | Randy's friends | Rebecca Cotswolds | Red Harris | Rod Stewart | Schlomo | Skyler Morse | Tommy Turner | Veronica | Yanagopa tribe | Yoko Ono|