<P> Developmental stages began for the film midway through the series' first season production in January 1998 . Co-creators Trey Parker and Matt Stone signed a deal with Comedy Central in April 1998 that contracted the duo to producing South Park episodes until 1999, gave them a slice of the lucrative spinoff merchandising the show generated within its first year, as well as an unspecified seven - figure cash bonus to bring the show to the big screen, in theaters . A large part of Parker and Stone's conditions attached to any potential movie project was that it must at least be R - rated, to keep in touch with the series' humor and its roots, the short The Spirit of Christmas . Parker stated that their desire was to approach the film from a much more creative perspective and do something other than a simple movie - length version of a regular episode . Despite alleged pressure from Paramount Pictures officials to keep the movie toned down, the two won the battle for a more mature rating . "They really wanted to be able to go beyond the South Park television show," said Comedy Central spokesman Tony Fox to TV Guide at the time . "They really fought hard for and won the right to make an R - rated movie ." Paramount executives went as far to prepare graphs displaying how much more money a PG - 13 - rated South Park feature would perhaps accumulate . The William Morris Agency, which represented Parker and Stone, pushed for movie production to begin as soon as possible, while public interest was still high, instead of several years into its run, as was done with Beavis and Butt - head Do America, possibly because Beavis and Butt - head and South Park were owned by Viacom Global Entertainment Group, a unit of the Viacom Media Networks division of Viacom after Doug Herzog left Viacom Media Networks on January 12, 2017 . </P> <P> The cast of South Park: Bigger, Longer & Uncut is mostly carried over faithfully from the television series . Co-creator Trey Parker voices the characters of Eric Cartman and Stan Marsh, and Satan, Clyde Donovan, Mr. Garrison, Phillip Niles Argyle, Randy Marsh, Mr. Mackey, Ned Gerblanski, the singing voice of Big Gay Al, the speaking voice of Gregory, The Mole, Adolf Hilter, and President Bill Clinton, as well as multiple other background characters . Matt Stone portrays Kyle Broflovski and Kenny McCormick, as well as Saddam Hussein (even though during the end credits it says that he was voiced by himself), Terrance Henry Stoot, Big Gay Al, Jimbo Kearn, Stuart McCormick, Gerald Broflovski, Bill Gates, and additional voices . Mary Kay Bergman voices Wendy Testaburger, the core mothers of the film (Sheila Broflovski, Sharon Marsh, Liane Cartman, and Carol McCormick), Shelley Marsh, and the clitoris . Isaac Hayes reprised his role from the series as Chef, and voice clips of staff children Jesse Howell, Anthony Cross-Thomas, and Franchesca Clifford make up Ike Broflovski . Guest voices for the film included George Clooney as Dr. Gouache, Brent Spiner as Conan O'Brien, Minnie Driver as Brooke Shields, Eric Idle as Dr. Vosnocker, and Dave Foley provides the combined voices of Alec, Billy, Daniel, and Stephen Baldwin . </P> <P> Michael McDonald as himself (the track "Eyes of a Child") and as Satan's high notes in "Up There", and Howard McGillin provides Gregory's singing voice in "La Resistance (Medley)". Stewart Copeland, former drummer for The Police, guests as an American soldier . Mike Judge, creator and voices of Beavis and Butt - head, King of the Hill and The Goode Family, provides Kenny's voice in his sole speaking appearance at the end of the film . Although initially denied by Paramount, Metallica lead singer James Hetfield said in 2001 that he provides vocals for the track "Hell Isn't Good". </P> <P> The season one episode "Death" heavily influenced the film's screenplay . The plot and theme of both scripts revolves heavily around the parents of South Park protesting about Terrance and Phillip due to the perceived negative influence it has over their children . Parker said, "After about the first year of South Park, Paramount already wanted to make a South Park movie, and we sort of thought this episode would make the best model just because we liked the sort of pointing at ourselves kind of thing ." During the time, the team was also busy writing the second and third seasons of the series, the former of which Parker and Stone later described as "disastrous". As such, they figured the phenomenon would be over soon, and they decided to write a personal, fully committed musical . </P>

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