Guest stars have lent their voices to the show including Jay Leno, George Clooney, Jennifer Aniston, Bill Hader, Robert Smith and the comedy duo Cheech & Chong voiced characters representing their likenesses for the season four (2000) episode "Cherokee Hair Tampons", which was the duo's first collaborative effort in 20 years.
They state that creating Cartman as a "little eight-year-old fat kid" made it easier for the two to portray a Bunker-like character after the introduction of political correctness to late-20th century television.
Bergman was originally listed in the credits under the alias Shannen Cassidy to protect her reputation as the voice of several Disney and other kid-friendly characters.
[24][25] Hayes agreed to voice the character after being among Parker and Stone's ideal candidates which also included Lou Rawls and Barry White.
Celebrities who have voiced themselves include Michael Buffer,[28][29] Brent Musburger,[30] Jay Leno,[31] Robert Smith,[32] and the bands Radiohead and Korn.
[33][34] Comedy team Cheech & Chong voiced characters representing their likenesses for the season four (2000) episode "Cherokee Hair Tampons", which was the duo's first collaborative effort in 20 years.
[35] Jennifer Aniston,[36] Richard Belzer,[37] Natasha Henstridge,[32] Norman Lear,[38] and Peter Serafinowicz[39] have guest starred as other speaking characters.
He also provides the voices of several recurring characters, such as Clyde Donovan, Mr. Hankey, Mr. Mackey, Stephen Stotch, Jimmy Valmer, Timmy Burch, Tuong Lu Kim and Phillip.
He also provides the voices of several recurring characters, such as Gerald Broflovski, Stuart McCormick, Craig Tucker, Jimbo Kern, Terrance, Saddam Hussein, Tweek Tweak, Mr. Adler and Jesus.
Isaac Hayes, who voiced the character Chef, left the show after Parker and Stone's depiction of his religion Scientology in the episode "Trapped in the Closet".