Chipmunk singing sensations Alvin, Simon, and Theodore are back for an encore in this hilarious 'squeakquel' packed with more action and more nutty fun for the whole family. When a concert mishap lands Dave in the hospital, the Chipmunks take a break from superstardom and enroll in school to fit in with kids their age. But they soon face some stiff competition when they meet the Chipettes, a beautiful, talented trio of chipmunks.

A scheme to open a theme park featuring real dinosaurs cloned from DNA turns into a catastrophe; two teams head for Site B, an island where the dinosaurs have been left alone for four years; renowned paleontologist Dr. Grant is tricked into flying over InGen's former breeding ground for prehistoric dinosaurs and must guide several people through the island.