- Directors: Tim Hill
- Producers: Ross Bagdasarian Jr, Janice Karman
- Writers: Jon Vitti, Will McRobb, Chris Viscardi, Rob Minkoff
- Genres: Comedy, Drama, Family, Fantasy, Music
- Actors: Jason Lee, David Cross, Cameron Richardson, Jane Lynch, Matthew Gray Gubler, Jesse McCartney, Justin Long
The story begins in the back of a hill, located in a forest during the summer. The tree that the chipmunks Alvin (voiced by Justin Long), Simon (voiced by Matthew Gray Gubler), and Theodore (voiced by Jesse McCartney) live in is cut down and driven to Los Angeles to become a Christmas tree. Once in LA, the Chipmunks meet struggling songwriter David Seville (Jason Lee) who had his latest song rejected by JETT Records executive Ian Hawke (David Cross) who was Dave’s college roommate. Dave once had a relationship with his next door neighbor, Claire Wilson (Cameron Richardson). She broke up with him because she felt he was too busy, irresponsible and he had no time for her.
After winding up at Dave’s interview, the Chipmunks hop into his basket and follow him home. Once at home, Dave discovers the Chipmunks, and is accidentally knocked unconscious. Upon waking, he kicks them out until hearing them sing “Only You (And You Alone)”. Dave then makes a deal with them; they sing the songs he writes, and in exchange he provides food and shelter for them. However, all does not go well, as Dave’s job presentation is ruined by their coloring on it, and when Alvin tries to set the mood for his dinner with Claire, things become weird and she rejects him after he tells her that “My life is being sabotaged by talking chipmunks”. To make it up to Dave, Alvin, Simon, and Theodore go to Ian in an attempt to record a song and get a record deal.
The end credits show several of The Chipmunks’ past albums.