Simon hosts his own show, playing Sherlock Holmes investigating several mysterious robberies.

The Chipmunks go on a treasure hunt and meet the ancient Chipmunk tribe called the Twee-Twee Tribe.

Dave is feeling depressed and is thinking that the Chipmunks would do better if he had never been apart of his life. Will the spirits of the Chipmunks convince him that he is indeed been an impact on Alvin, Simon, and Theodore’s lives?