Eminem, Dr. Dre and Kid Rock will all appear on rapper Trick Trick's new album The Visitor. Eminem will make a rare cameo on The Villian track "Who Want It." Talking about the supposedly-now-obese Slim Shady, Trick Trick told MTV "He picked up a little weight. He can still run two miles if you want him to and still out-box the majority of them." Em's old mentor Dr. Dre also contributes, producing the song "Hold On," while the last-ever verse recorded by D-12 member Proof, who was killed in 2006, appears on "Together Forever." Of course, no Detroit album is complete without Kid Rock, who also features on "Together Forever." Now if only Trick Trick could get the White Stripes and Rip Hamilton involved, he'd have all his Detroit-related bases covered.