Alvin (voiced by Justin Long), Simon (Matthew Gray Gubler) and Theodore (Jesse McCartney) are back, along with their careworn manager, Dave (Jason Lee), and this time they have competition: The Chipettes (Anna Faris, Christina Applegate and Amy Poehler), hired by Dave's nemesis, Ian Hawke (David Cross). Cameron Richardson, Zachary Levi and Wendie Malick also lend their voice talents for this good-time live-action/CGI sequel.