Pop sensations Alvin, Simon and Theodore end up in the care of Dave Seville''s twenty-something nephew Toby (Zachary Levi). The boys must put aside music superstardom to return to school, and are tasked with saving the school''s music program by winning the $25,000 prize in a battle of the bands. But the Chipmunks unexpectedly meet their match in three singing chipmunks known as The Chipettes.