The Barden Bellas are back to pitch slap the world. It's been three years since the Bellas brought their signature vocals, style and attitude to become the first all-female group to win a national title. But when they get banned after a scandal that threatens to derail their last year at Barden, the three-time defending champs worry that this time they've lost their harmony for good. The Bellas must fight for their right to win the World Championships of A Cappella in Copenhagen.