Theodore's new talking teddy bear drives Alvin and Simon crazy.

Alvin is not thrilled about going back to school, until he sees the new principal.

When Theodore disappears from his bed, Alvin becomes convinced that he has been kidnapped by aliens.

The Chipmunks and Chipettes join forces in order to offer Jeanette a magical, fairy tale birthday.

Theodore posts a video of himself rapping on the Internet and it becomes a big hit.

Alvin thinks his neighbor is responsible for a recent diamond heist.