Question: Who provides the voice for "Chef" in the Comedy Central series "South Park" on the "Starvin Marvin" episode where Chef tries to get residents to fight back in a parody of the movie Braveheart?

full_context: Document 1: Starvin' Marvin in Space: Starvin' Marvin in Space is episode 44 of the animated television series South Park. It originally aired on Comedy Central in the United States on November 17, 1999. Like the episode Mr. Hankey's Christmas Classics, the episode is dedicated to Mary Kay Bergman, who lent her voice to nearly all of South Park's female characters. This was the last show to use dialogue by Bergman, who committed suicide shortly after production was completed.
Document 2: Kyle Broflovski: Kyle Broflovski (sometimes spelled Kyel Broflovski, Broslovski, Broslofski, Brovlofski or Broflofski) is a main character in the Comedy Central series "South Park". He is voiced by and loosely based on co-creator Matt Stone. Kyle is one of the show's four central characters, along with his friends Stan Marsh, Kenny McCormick, and Eric Cartman. He debuted on television when "South Park" first aired on August 13, 1997, after having first appeared in "The Spirit of Christmas" shorts created by Stone and long-time collaborator Trey Parker in 1992 ("Jesus vs. Frosty") and 1995 ("Jesus vs. Santa").
Document 3: Chef Aid: "Chef Aid" is the fourteenth episode in the second season of the American animated television series "South Park". The 27th episode of the series overall, it originally aired on Comedy Central in the United States on October 7, 1998. The episode was written by series co-creators Trey Parker and Matt Stone, and directed by Parker. Guest stars in this episode include Joe Strummer, Rancid, Ozzy Osbourne, Ween, Primus, Elton John, Meat Loaf, Rick James, and DMX.
Document 4: Death (South Park): "Death" is the sixth episode in the first season of the American animated television series "South Park". It originally aired on Comedy Central in the United States on September 17, 1997. In the episode, Grandpa Marvin tries to convince Stan to kill him, while the parents of South Park protest the foul-mouthed cartoon "Terrance and Phillip". Death himself arrives to kill Kenny, and presents a warning to Grandpa Marvin against forcing others to help him commit suicide.
Document 5: Eric Cartman: Eric Theodore Cartman, often referred to as just Cartman, is a main character in the animated television series "South Park", created by Matt Stone and Trey Parker, and voiced by Trey Parker. Cartman, generally referred to by his surname, is one of four central characters in "South Park", along with his friends Stan Marsh, Kyle Broflovski, and Kenny McCormick. Cartman first appeared, originally named Kenny, in prototypical form in a 1992 animated short "Jesus vs. Frosty", and a 1995 animated short "Jesus vs. Santa", and first appeared on television in the pilot episode of "South Park", "Cartman Gets an Anal Probe", on August 13, 1997.
Document 6: Cartman's Mom Is a Dirty Slut: "Cartman's Mom Is a Dirty Slut" is the first season finale of the American animated television series "South Park". It originally aired on Comedy Central in the United States on February 25, 1998. The episode is the highest viewed episode in the entire "South Park" series, with 6.4 million views. It is part one of a two-episode story arc, which concluded with "Cartman's Mom Is Still a Dirty Slut". The episode follows Eric Cartman, one of the show's child protagonists, becoming curious about the identity of his father. He discovers that his father is most likely a man his mother had sexual intercourse with during an annual party called "The Drunken Barn Dance". Meanwhile, his friends Stan, Kyle and Kenny participate on "America's Stupidest Home Videos", after filming Cartman playing in his yard with plush toys.
Document 7: South Park: South Park is an American adult animated sitcom created by Trey Parker and Matt Stone and developed by Brian Graden for the Comedy Central television network. The show revolves around four boys—Stan Marsh, Kyle Broflovski, Eric Cartman, and Kenny McCormick—and their bizarre adventures in and around the titular Colorado town. Much like "The Simpsons", "South Park" uses a very large ensemble cast of recurring characters and became infamous for its profanity and dark, surreal humor that satirizes a wide range of topics towards a mature audience.
Document 8: Chef Aid: The South Park Album: Chef Aid: The South Park Album is a 1998 soundtrack/compilation album based on the American animated comedy series "South Park". Several well-known artists perform on the record, which was mainly produced by Rick Rubin. "Chef Aid" contains a number of songs from and inspired by the show, while other songs are largely independent from "South Park". The album was released during the show's second season, shortly after the broadcast of the episode called "Chef Aid", which features many of the stars and songs that appear on the recording. Soul singer Isaac Hayes appears in character as Chef throughout the album, which mimicks a live concert.
Document 9: Kenny McCormick: Kenneth "Kenny" McCormick is a main character in the animated adult television series "South Park", along with his friends Stan Marsh, Kyle Broflovski, and Eric Cartman. His oft-muffled and indiscernible speech—the result of his parka hood covering his mouth—is provided by co-creator Matt Stone. He debuted on television when "South Park" first aired on August 13, 1997, after having first appeared in "The Spirit of Christmas" shorts created by Stone and long-time collaborator Trey Parker in 1992 ("Jesus vs. Frosty") and 1995 ("Jesus vs. Santa").
Document 10: Chef (South Park): Jerome "Chef" McElroy is a cartoon character on the Comedy Central series "South Park" who was voiced by soul singer Isaac Hayes. A cafeteria worker (as his nickname implies) at the local elementary school in the town of South Park, Colorado, Chef is generally portrayed as more level-headed than the other adult residents of the town, and sympathetic to the kids. His guidance is often sought by the show's core group of child protagonists – Eric Cartman, Stan Marsh, Kyle Broflovski, and Kenny McCormick – as he is usually the only adult whom they consistently trusted. To an inadvertent fault, he frequently gives inappropriate advice, usually in the non sequitur form of a lascivious soul song.
Document 11: South Park (season 1): The first season of the animated television series "South Park" ran for 13 episodes from August 13, 1997 to February 25, 1998 on the American network Comedy Central. The creators Trey Parker and Matt Stone wrote most of the season's episodes; Dan Sterling, Philip Stark and David Goodman were credited with writing five episodes. The narrative revolves around four children—Stan Marsh, Kyle Broflovski, Eric Cartman and Kenny McCormick—and their unusual experiences in the titular mountain town.
Document 12: Starvin' Marvin (South Park): "Starvin' Marvin" is the eighth episode in the first season of the American animated television series "South Park". It first aired on Comedy Central in the United States on November 19, 1997. In the episode, Cartman, Kenny, Kyle and Stan send money to an African charity hoping to get a sports watch, but are instead sent an Ethiopian child whom they dub "Starvin' Marvin". Later, Cartman is accidentally sent to Ethiopia, where he learns activist Sally Struthers is hoarding the charity's food for herself. In an accompanying subplot, after genetically engineered turkeys attack South Park residents, Chef rallies the residents to fight back, in a parody of the film "Braveheart".
Document 13: Cartman Gets an Anal Probe: "Cartman Gets an Anal Probe" is the first episode of the American animated television series "South Park". It first aired on Comedy Central in the United States on August 13, 1997. The episode introduces child protagonists Eric Cartman, Kyle Broflovski, Stan Marsh and Kenny McCormick, who attempt to rescue Kyle's younger brother Ike from being abducted by aliens.
Document 14: The Return of Chef: "The Return of Chef" is the first episode in the tenth season of the American animated television series "South Park". The 140th episode of the series overall, it first aired on Comedy Central in the United States on March 22, 2006. The episode was the first after the departure of actor Isaac Hayes, who voiced the character Chef. Hayes, a Scientologist, left after a falling-out with the creators over their treatment of Scientology in the previous season's episode "Trapped in the Closet". Scientology has been accused of using brainwashing techniques, and the episode portrays Chef as having been brainwashed.
Document 15: Stan Marsh: Stanley Randall "Stan" Marsh is the protagonist of the animated television series "South Park". He is voiced by and loosely based on series co-creator Trey Parker. Stan is one of the show's four central characters, along with his friends Kyle Broflovski, Kenny McCormick and Eric Cartman. He debuted on television when "South Park" first aired on August 13, 1997, after having first appeared in "The Spirit of Christmas" shorts created by Parker and long-time collaborator Matt Stone in 1992 ("Jesus vs. Frosty") and 1995 ("Jesus vs. Santa").
ground_truth: soul singer Isaac Hayes