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History

After the release of Ultramagnetic MCs' debut album, Critical Beatdown, Thornton was reportedly institutionalized in Bellevue Hospital Center. However, he admitted later that the idea that he was institutionalized came from a flippant remark made during a stressful interview and he never expected the story to become so well-known. Following the unsuccessful release of Ultramagnetic MCs' second and third albums, Thornton released his first notable solo single, "Earth People," in 1995, under the name Dr. Octagon, followed by the release of Dr. Octagonecologyst the following year. The album's production by Dan the Automator and scratching by DJ Qbert was acclaimed by critics, and the album was released nationally by DreamWorks Records, who also issued an instrumental version of the album, titled Instrumentalyst (Octagon Beats). Thornton followed the album with Sex Style in 1997 under the name Kool Keith.

In 1998, Thornton collaborated with Tim Dog for the single "The Industry is Wack," performing under the name Ultra. The following year, he released the album First Come, First Served under the name "Dr. Dooom", in which the album's main character killed off Dr. Octagon on the album's opening track. On August 10, 1999, Thornton released Black Elvis/Lost in Space. It peaked at #10 on the Billboard Heatseekers chart, #74 on the Top R&B/Hip-Hop Albums chart, and #180 on the Billboard 200. On July 25, 2000, Thornton released the album Matthew. It peaked at #47 on the Billboard Heatseekers chart. The same year, Thornton collaborated with Ice-T, Marc Live, Black Silver and Pimp Rex for the album Pimp to Eat, under the group name Analog Brothers, with Keith performing as Keith Korg and Ice-T as Ice Oscillator.

On June 5, 2001, Thornton released the album Spankmaster on Esham's Overcore Records through TVT Records. It peaked at #16 on the Billboard Heatseekers chart, #11 on the Top Independent Albums chart and #48 on the Top R&B/Hip-Hop Albums chart. In 2002, Thornton began recording The Resurrection of Dr. Octagon with producer Fanatik J, signing a contract with CMH Records to release the album, which was eventually completed without much input from Thornton, due to a falling out over contractual terms. Thornton, Marc Live and H-Bomb formed the group KHM, releasing the album Game on November 19, 2002, changing their name to "The Clayborne Family" by the release of their second album. On October 12, 2004, Thornton released the mixtape Official Space Tape. The same day, Real Talk Entertainment issued the unauthorized release Dr. Octagon Part 2. The album was discontinued by court order. On April 25, 2006, Thornton released the album Nogatco Rd. under the name Mr. Nogatco. On June 27, The Return of Dr. Octagon was released by OCD International, an imprint of CMH, advertised as the official follow-up to Dr. Octagonecologyst. Some critics felt that it was not as good as its predecessor. Thornton stated that he liked the album, but felt that it hurt his reputation as a musician. In August, Thornton performed under the Dr. Octagon billing, but did not acknowledge the release of the OCD album.

Lyrical and performance style

Thornton's lyrics are often abstract, surreal, and filled with non-sequiturs and juvenile humor. Thornton is also known for an explicit style focusing on sexual themes, which Thornton has referred to as "pornocore".In a 2007 interview, Thornton claims to have "invented horrorcore".

Discography
1996: Dr. Octagonecologyst
1997: Sex Style
1999: First Come, First Served
1999: Black Elvis/Lost in Space
2000: Matthew
2001: Spankmaster
2004: Diesel Truckers (with KutMasta Kurt)
2006: Nogatco Rd.
2006: Project Polaroid (with TomC3)
2006: The Return of Dr. Octagon
2008: Dr. Dooom 2
2009: Tashan Dorrsett