Alvin and his band are stars but also need to concentrate on school and then find themselves in a school battle of the bands. Their main rivals turn out to be the Chipettes, (Brittany, Eleanor and Jeanette) and that's where things start to get really interesting...
The CGI singing rodents return in this disposable kidflick. Jason Lee gets crippled early, and mostly sits out the film, entrusting his chipmunk pals to cousin Zachary Levi who sends them to school, where Alvin (Justin Long) becomes a jock and turns his tail on his meeker siblings.
Meanwhile, the band’s evil ex-manager promotes rivals The Chipettes (voiced by Amy Poehler, Christina Applegate and Anna Faris), who are no more computer-augmented than many other girl groups. Alvin must be the most unsympathetic lead in any kiddie franchise, and having him do squeaked-up De Niro impersonations doesn’t help.
Alvin does high school rom-com and very poorly at that.