In this feature film based on the hit animated series, the third graders of South Park sneak into an R-rated film by ultra-vulgar Canadian television personalities Terrance (Matt Stone) and Phillip (Trey Parker), and emerge with expanded vocabularies that leave their parents and teachers scandalized. When outraged Americans try to censor the film, the controversy becomes a call to war with Canada, and Terrance and Phillip end up on death row -- with only the kids left to save them.

Delphine (Catherine Deneuve) and Solange (Françoise Dorléac) are twin sisters who each want to find romance and leave their small seaside town of Rochefort, France. Soon they befriend a couple of visiting carnival workers who frequent their lonely mother's (George Chakiris) café and hire the girls to sing in the carnival. Wanting a career as a songwriter, Solange falls for an American musician, Andy (Jacques Perrin), while Delphine dumps her beau and searches Rochefort for her ideal man.

Overly enthusiastic guitarist Dewey Finn (Jack Black) gets thrown out of his bar band and finds himself in desperate need of work. Posing as a substitute music teacher at an elite private elementary school, he exposes his students to the hard rock gods he idolizes and emulates -- much to the consternation of the uptight principal (Joan Cusack). As he gets his privileged and precocious charges in touch with their inner rock 'n' roll animals, he imagines redemption at a local Battle of the Bands.

Sebastian (Ryan Gosling) and Mia (Emma Stone) are drawn together by their common desire to do what they love. But as success mounts they are faced with decisions that begin to fray the fragile fabric of their love affair, and the dreams they worked so hard to maintain in each other threaten to rip them apart.