David Cross Ian
Justin Long Alvin (voice)
Jason Lee Dave
Jane Lynch Gail
Jon Vitti Screenplay, Story
Matthew Gray Gubler Simon (voice)
Cameron Richardson Claire
Beth Riesgraf Mother in Store
Paul Massey Sound Mixer
Arnon Milchan Executive Producer
Jesse McCartney Theodore (voice)
Tim Hill Director
Oliver Muirhead Butler
Adriane Lenox Vet
Jillian Warry Barberie Jillian Reynolds
Julianne Jordan Music Supervisor
Emily Ferry Property Master
Christopher Scott Dancer
David Giammarco Sound Mixer
Mindy Marin Casting
Alicia Stevenson Foley Artist
Christopher Flick Foley Editor
Christopher Lennertz Original Music Composer
R.J. Kizer ADR Editor
Peter Lyons Collister Director of Photography
Kevin Symons Ted
John Robotham Stunts
Gary Burritt Negative Cutter
Ross Bagdasarian, Jr. Alvin (singing voice) (uncredited)
Veronica Alicino Amy
John Moio Stunt Coordinator
Janice Karman Producer, Theodore (singing voice) (uncredited)
Doug Jackson Sound Effects Editor
Mildred Iatrou Supervising Sound Editor
John Murray Foley Supervisor
George Fisher Stunts
Toni-Ann Walker Hair Department Head
Cheri Minns Makeup Department Head
Charlie Daboub Art Direction
Tiara Parker Female Intern 2
Natalie Cohen Poolside Girl (uncredited)
Karen Rosenfelt Executive Producer
Harry Muller Color Timer
Michele Panelli-Venetis Associate Producer
Nick Drago Dancer
Tom Brown Music Arranger
Don Tiffany Engineer
Dawn Fintor Foley Artist
Scott Curtis Foley Editor
David Betancourt Foley Mixer
Debbie Evans Stunts
Melanie Lewis Dancer
Armen Ksajikian Musician
Christian Wood Digital Compositor
Perry Dodgson Boom Operator
Justin Hammond Lighting Technician
Joel Foster Animation
Ross Bagdasarian Producer, Characters
Dan Haring Lighting Technician
David MacMillan Production Sound Mixer
Rebecca Robertson Script Supervisor
Shane D. Kelly Gaffer
Kevin E. Patterson Utility Sound
Tim Gomillion Sound Recordist
Jayden Lund Security Guard
Kyndra Reevey Dancer
Rosero McCoy Choreographer
Michele Imperato Stabile Executive Producer, Unit Production Manager
Dennis Rogers Sound Recordist
Galen Goodpaster First Assistant Sound Editor
Leigh Shanta Unit Production Manager
Emily A. Wilson Art Department Coordinator