A group of longtime friends, led by Z-Bob (Kal Penn) and Ash (Donald Faison), decide to throw a raucous bachelor party in Las Vegas for their soon-to-be-hitched friend, Nathan (Jonathan Bennett). Their eclectic mix of exploits, which include paintball, strippers and gambling, are masterminded by a party planner, Mr. Kidd (Vincent Pastore). But when it turns out that "Mr. Kidd" is actually a professional criminal planning to rob a casino, the bachelor party gets turned on its head.