During a benefit concert in Paris, France, David Seville is seriously injured from a backstage accident, when a cardboard cutout of Alvin sends him flying across the stage. Having to recuperate there, Dave asks his aunt, Jackie, to look after the Chipmunks, Alvin, Simon, and Theodore. Arrangements are also made for them to go to public school at West Eastman High School. After Jackie also has an accident, the Chipmunks are left in the care of Toby, Jackie's grandson.