As lead singer and keyboardist of a rock band, Craig (Craig Robinson) knows a thing or two about working the crowd. But his day job is where he really makes the grade.

Every struggling artist knows the drill: you gotta pay the bills while you wait for that big break. So when Craig finds himself short on cash, he takes a job as a substitute teacher. It's an easy gig, right? Throw a DVD in the player, dim the lights and sleep off last night's party. But when he realizes that the kids think his class is an easy A, Craig's inspired to inspire his students. Music is his passion and he's not about to let anyone sleep though this period... period.

The school principal (Jean Smart) is a woman who believes that rules were made to be strictly upheld. She's none too fond of Craig's unorthodox teaching style - or his crush on the pretty English teacher. If he wants to keep his gig, get the girl and teach these kids the joys of music, he'll have to buckle down, shape up and rock out.