There's a whole world under the surface and only Ron has any idea about it.

When Theodore discovers Alvin and Simon have a secret club, he promises not to tell anyone if they let him join. When pirates show up at the house, the boys do all they can to protect a treasure chest ...

Everyone's favorite chipmunks -- Alvin, Simon and Theodore -- are back in this computer-animated version of the classic animated series. The brothers are famous rock stars who tour around the world ...