Question: What group does Stan join in an episode of a show that saw the departure of Isaac Hayes?

Context paragraphs:
Truck Turner: Truck Turner (also known as "Black Bullet") is a 1974 blaxploitation film, starring Isaac Hayes and Yaphet Kotto, and directed by Jonathan Kaplan.  The screenplay was written by Michael Allin, Jerry Wilkes and Oscar Williams.  Isaac Hayes also scored the music for the soundtrack.  The film was released by American International Pictures as a double feature with "Foxy Brown".

South Park (season 10): The tenth season of "South Park", an American animated television series created by Trey Parker and Matt Stone, began airing on March 22, 2006.  The tenth season concluded after 14 episodes on November 15, 2006.  This is the first season in which Kenny does not die and the last season featuring Isaac Hayes (the voice of Chef) as Hayes quit the show following the backlash behind season nine's "Trapped in the Closet" episode.  This season also had a minor controversy when the Halloween episode "Hell on Earth 2006" depicted "The Crocodile Hunter's" Steve Irwin with a stingray lodged in his chest getting thrown out of Satan's Halloween party for not being in costume.  Episode 2 in this season is the last one with the Braniff Airlines logo.  All the episodes in this season were written and directed by Trey Parker.

Rain on Me: "Rain on Me" is a single released by R&B singer Ashanti in 2003 from her second album "Chapter II".  The single reached number seven on the "Billboard" Hot 100 chart in the United States and the top 20 in the United Kingdom.  In the video Ashanti plays a superstar abused by a jealous boyfriend, played by actor Larenz Tate.  The video was released on August 28, 2003.  The video was shot in Barcelona, Spain, and directed by Hype Williams.  It contains a sample of "The Look Of Love" by Isaac Hayes but the sample was based on Snoop Dogg's song "G'z Up Hpes Down", which also sampled the same Isaac Hayes song.  The rap remix found on her "Collectibles" album interpolates "Can I Live?"  by rapper Jay-Z, which also samples the same Hayes song (and also produced by Irv Gotti).  The remix also features Hussein Fatal and fellow The Inc.  Records labelmates Charli "Chuck" Baltimore and Ja Rule.  There are two videos for the song.

Presenting Isaac Hayes: Presenting Isaac Hayes is the debut studio album by American soul musician Isaac Hayes.  The album was released in 1968, by Enterprise and Atlantic Records.  The LP was the first release on Stax Records' Enterprise label; Hayes had for several years served as one of Stax's key songwriters, producers, and studio musicians.

Trapped in the Closet (South Park): "Trapped in the Closet" is the twelfth episode in the ninth season of the American animated television series "South Park".  The 137th episode of the series overall, it originally aired on Comedy Central in the United States on November 16, 2005.  In the episode, Stan joins Scientology in an attempt to find something "fun and free".  After the discovery of his surprisingly high "thetan levels", he is recognized as the reincarnation of L. Ron Hubbard, the founder of the church.  The episode was written and directed by series co-creator Trey Parker.  The title is a reference to the R. Kelly serialized song of the same name and a satirized version of R. Kelly appears in the episode.

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.

Love Attack (album): Love Attack is the eighteenth studio album by American Soul musician Isaac Hayes.  The album was released on September 20, 1988, by CBS and Columbia Records.  It features a new version of Jerry Butler's "I Stand Accused", which Hayes already covered on his 1970 album "The Isaac Hayes Movement" and a cover of Billy Joel’s "She's Got a Way".  Like the previous album "U-Turn", "Love Attack" features mainly synthesizers and drum machines, and the same team of musicians including Gerald Jackson and Bill Mueller.

Chocolate Chip (album): Chocolate Chip is the seventh studio album by American soul musician Isaac Hayes.  It was released in 1975 by ABC Records through Hayes' own imprint, Hot Buttered Soul Records, marking Hayes' first release after leaving the then-financially troubled Stax label.  The album was Hayes's segue into the emerging disco scene and featured horns and layered beats, while maintaining his traditional soulful vocals.  "Chocolate Chip" garnered two top 20 singles and was Hayes's last hit album in the 1970s.

...To Be Continued (Isaac Hayes album): ...To Be Continued is the fourth studio album by American soul musician Isaac Hayes, issued in 1970 on Stax Records' Enterprise label.  The LP includes Hayes' cover of the Burt Bacharach/Hal David composition "The Look of Love", which was issued as a single in an edited form, peaking at #79 on the "Billboard" Hot 100.  Hayes had covered Bacharach/David songs on his previous albums "Hot Buttered Soul" ("Walk On By") and "The Isaac Hayes Movement" ("I Just Don't Know What to Do With Myself").

The Isaac Hayes Movement: The Isaac Hayes Movement is the third studio album by the American soul musician Isaac Hayes.  Released in 1970, it was the follow-up to "Hot Buttered Soul", Hayes' landmark 1969 album.  Marvell Thomas had come up with "The Isaac Hayes Movement" as a name for Hayes' backup ensemble.  He modeled the name after the Jimi Hendrix Experience.  Similar in structure to "Hot Buttered Soul", "The Isaac Hayes Movement" features only four long tracks, all with meticulous, complex and heavily orchestrated arrangements.  However, unlike the previous album, this time all four songs are reworked covers of others' material.  This includes Jerry Butler's "I Stand Accused", which features a nearly five-minute long spoken intro that precedes the actual song, and The Beatles' "Something", which features violin soloing by John Blair.  The other two songs included on the album were the Bacharach-David song, "I Just Don't Know What to Do with Myself" and Chalmers and Rhodes' "One Big Unhappy Family".

Supporting paragraphs: The Return of Chef Trapped in the Closet (South Park)
Answer: Scientology