D12, an acronym for The Dirty Dozen, is an American hip hop group from Detroit, Michigan. D12 has had chart-topping albums in the United States, United Kingdom, and Australia. D12 was formed in 1996, and achieved mainstream success after Eminem rose to international fame. D12 released the album Devil's Night in 2001 and D12 World in 2004, spawning numerous hits such as "Fight Music", "Purple Pills", "My Band", "How Come" and "Shit on You" throughout that period. Since 2006, Eminem's hiatus and the death of the member Proof resulted in them being less active in subsequent years.

In order to make up the dozen, it was decided the six members at the time would each create an alter-ego. Proof's was Dirty Harry, Bizarre's was Peter S. Bizarre, Kuniva's was Hannz G. (which later became Rondell Beene), Kon Artis' was Mr. Porter, Bugz' was Robert Beck and Eminem created the famous character Slim Shady.

In 1997, they released their debut album, The Underground EP, which was recorded between 1996 and 1997. In 1997 and through 1998, its members began establishing reputations locally. Bizarre was named Inner City Entertainment's "Flava of the Week" and went on to release an album called Attack of the Weirdos. Along with Eminem, Rah Digga and Young Zee, he became an honorary member of The Outsidaz. Proof won a freestyling competition run by The Source.

Ryan Daniel Montgomery (born July 5, 1977), better known by his stage name Royce da 5'9", is an American rapper. He is known for his longtime association with Eminem and for his solo career, recording primarily with Carlos "6 July" Broady and DJ Premier, as well as ghostwriting for the likes of Diddy and Dr. Dre. Royce is one half of the rap duo Bad Meets Evil with Eminem and also a member of hip hop group Slaughterhouse. The editors of About.com ranked him #33 on their list of the Top 50 MCs of Our Time (1987–2007).

Ryan Montgomery was born and raised on the West side of Detroit, Michigan on W. McNichols & Wyoming Ave. He moved to Oak Park, Michigan when he was 10 years old, later acquiring the nickname "Royce" during high school after wearing a Turkish link chain with an R pendant resembling the Rolls Royce symbol. He started rapping at age 18, influenced mainly by Ras Kass and Redman. He signed his first deal in 1998 with Tommy Boy Records, after the label shut down, he signed a deal with Columbia where he started recording an album called Rock City, referring to Detroit's former status as home to Motown Records. When the project was heavily bootlegged, Royce left the label for Koch to re-record some of the album, eventually releasing it in 2002 as Rock City (Version 2.0). While the album did not sell very well, the DJ Premier-produced single "Boom" gained Royce some underground recognition and eventually resulted in the two working together more closely.

Obie Trice III (born November 14, 1977) is an American rapper and songwriter. He began rapping at the age of 11, and is most known for his time spent signed to Shady Records. Obie Trice has formed his own record label, Black Market Entertainment.

Obie Trice III was born and raised in Detroit, Michigan by his mother, along with three brothers. He is of African American descent. Trice was given a karaoke machine by his mother when he was eleven and he used it to rhyme over instrumentals from artists such as N.W.A. By the age of fourteen, he was attending rap battle spots around Detroit, notably including the Hip Hop Shop, on which Trice commented,

Obie Trice went by the name of Obie 1 during this time, but when he first met Proof, who was about to introduce him at the Hip Hop Shop, Proof asked him, "What's your name? Your real name, no gimmicks." He was then introduced as Obie Trice, and has kept his real name as his rap name. Trice was introduced to Eminem through D12 member Bizarre. Eminem was impressed when Trice freestyled for him in a car park through a window, whilst Eminem was in a car. Later, Trice received a call from his manager informing him that he would be having dinner with Eminem, and later that night they went to a Kid Rock party.