Zack (DANE COOK) is a laidback, thirty-something box boy at a warehouse club where he works with his friends and fellow box boys, nerdy Russell (HARLAND WILLIAMS), middle-aged family man Iqbal (BRIAN GEORGE), and Lon (ANDY DICK) whose super-thick glasses do little to improve his poor vision.
They realize they'll never be like egotistical head cashier Vince (DAX SHEPARD) who, with the aide of sycophant Jorge (EFREN RAMIREZ), has won the employee of the month award for the past 17 months straight and is a favorite of store manager Glen Gary (TIM BAGLEY) and his assistant Dirk (SEAN WHALEN). Should he win one more, he'll not only enter the employee hall of fame and move one step closer to a management position, but he'll also be awarded a new car.
Pretty much everyone has conceded the competition to him except, that is, Zack who suddenly is motivated to challenge the champion. That's because he's learned that newly transferred and gorgeous cashier Amy (JESSICA SIMPSON) reportedly has a thing for sleeping with employee of the month winners. Tired of Vince and everything about him -- including him also making a move on Amy -- Zack sets out to win the award and thus her favors, no matter the costs. When Glen's boss and diminutive brother Glen Ross (DANNY WOODBURN) shows up to inspect the Super Club facility, the stakes get even higher as Vince and Zack do what it takes to defeat the other.