Zachary Levi Toby
Anna Faris Jeanette (voice)
Wendie Malick Dr. Rubin
Sean Astin Meerkat Manor Narrator (voice)
Jason Lee Dave
Justin Long Alvin (voice)
Christina Applegate Brittany (voice)
Lanny Joon Paramedic
David Cross Ian
Alexandra Shipp Valentina
Eric Bauza Digger the NASCAR Gopher (voice)
Matthew Gray Gubler Simon (voice)
Aimee Carrero Emily
Amy Poehler Eleanor (voice)
Kathryn Joosten Aunt Jackie
Jesse McCartney Theodore (voice)
Brando Eaton Jeremy
Rachele Brooke Smith Chipette Dancer
Jon Vitti Writer
Bernard White Doctor
Alicia Stevenson Foley Artist
Jonathan Aibel Writer
Anjelah Johnson-Reyes Julie
Glenn Berger Writer
Kevin G. Schmidt Ryan
Gregg Binkley Emcee
Betty Thomas Director
Marty Dew Chipmunk Dancer
Willie D. Burton Sound Mixer
Dawn Fintor Foley Artist
David Newman Original Music Composer
Anthony B. Richmond Director of Photography
Archie Hahn Agent
David Lucarelli Sound Recordist
Arnon Milchan Executive Producer
Janice Karman Producer, Theodore / The Chipettes (singing voice) (uncredited)
Ross Bagdasarian Jr. Producer, Alvin (singing voice) (uncredited)
Ross Bagdasarian Characters
Gary C. Bourgeois Sound Re-Recording Mixer
Chuck Michael Sound Effects Editor
R.J. Kizer ADR Editor
Julie D'Antoni Visual Effects
Steven Lambert Stunts
Seth Yanklewitz Casting
Guy Bar'ely Animation
Scott Curtis Foley Editor
Charles Crivier Key Grip
Laura Graham ADR Editor
Bridgit Mendler Becca
Jaimie Trueblood Still Photographer
Cheri Minns Makeup Department Head
Lori McCoy-Bell Hair Department Head
Juel Bestrop Casting
David Betancourt Foley Mixer
Rosero McCoy Choreographer
Michael Keller Sound Re-Recording Mixer
Doug Jackson Sound Effects Editor
Joy Osmanski Airline Rep
Gee Alexander Simon Dance Double (uncredited)
Chris Warren Xander
Paul Sonski Set Designer
David 'Goldy' Goldsmith Video Assist Operator
David Lautman High School Student (uncredited)
Julianne Jordan Music Supervisor
Elena Arroy Key Makeup Artist
Marcia Hinds Production Design
Jeff Carson Music Editor
Karen Rosenfelt Executive Producer
Rebecca Robertson Script Supervisor
Michael J. Benavente Supervising Sound Editor
Raman Rao Rigging Gaffer
Tallie Brinson Principal Dancer (uncredited)