Return of the Dozen is the third mixtape by American hip hop group D12. It was released on May 21, 2008 under Shady Records & Interscope Records This was their first project since the passing of the group’s leader Proof in 2006 & it was designed to get them back on their feet in preparation for new possible content. Eminem notably doesn’t appear on the tape at all, as he was busy recording his sixth album Relapse