The Chipmunks return for another feature-length animated adventure. Everyone thinks that Alvin has been watching too many late night horror movies when he becomes convinced that mysterious new neighbour Mr Talbot is a werewolf. However, after Theodore is nipped by his 'dog' and develops a penchant for chewing socks, even the ever-logical Simon concedes that there could be something in his brother's theory. Can they find a cure for Theodore before he starts going on the prowl?