Alvin is forced to clean up the house after throwing a wild party while Dave is away and is not allowed to go with his brothers to Fantasy Park. During which, he combats his fear of loneliness, and ...

While Dave is at the store, The Chipmunks meet the new neighbor, who does not like being disturbed as he sleeps. Unfortunately, he works nights, which doesn't bode well with The Chipmunks rehearsing ...