Arlen is sent to a fenced-off wasteland where undesirables are exiled to when she is kidnapped by a group of cannibals. She escapes and ends up on a journey to reunite a missing girl with her father.

After the highs of winning the world championships, the Bellas find themselves split apart and discovering there aren't job prospects for making music with your mouth. But when they get the chance to reunite for an overseas USO tour, this group of awesome nerds will come together to make some music, and some questionable decisions, one last time.