It's the Chipmunks' third and final full-length feature! Alvin and accusations of werewolves are fighting. Alvin believes that the brand new neighbor Mr. Talbot is still a werewolf. Of course, no one believes him. The boys are focusing on the school production of Dr. Jekyll &. Mr. Hyde. When the school auditorium is blown by Alvin, he is expelled from the production. Theodore is placed in to rise his absence of confidence. Alvin and Simon are trying to find the key of Mr. Talbot. Will the play go as planned or will the Chipmunks mess it up?!