Sean Astin Meerkat Manor Narrator (voice)
Anna Faris Jeanette (voice)
Wendie Malick Dr. Rubin
Justin Long Alvin (voice)
Jason Lee Dave
Alexandra Shipp Valentina
Zachary Levi Toby
Christina Applegate Brittany (voice)
David Cross Ian
Amy Poehler Eleanor (voice)
Rachele Brooke Smith Chipette Dancer
Jesse McCartney Theodore (voice)
Lanny Joon Paramedic
Paul Sonski Set Designer
Matthew Gray Gubler Simon (voice)
Gee Alexander Simon Dance Double (uncredited)
Jonathan Aibel Writer
David 'Goldy' Goldsmith Video Assist Operator
Gregg Binkley Emcee
Mildred Iatrou Supervising Sound Editor
Glenn Berger Writer
Aimee Carrero Emily
R.J. Kizer ADR Editor
Eric Bauza Digger the NASCAR Gopher (voice)
Lori McCoy-Bell Hair Department Head
Bernard White Doctor
Arnon Milchan Executive Producer
Rosero McCoy Choreographer
Bridgit Mendler Becca
Nancy MacLeod Sound Effects Editor
Alicia Stevenson Foley Artist
Joy Osmanski Airline Rep
Chuck Michael Sound Effects Editor
David Newman Original Music Composer
Steven Lambert Stunts
Ross Bagdasarian, Jr. Producer, Alvin (singing voice) (uncredited)
Betty Thomas Director
Doug Jackson Sound Effects Editor
Julie D'Antoni Visual Effects
Janice Karman Producer, Theodore / The Chipettes (singing voice) (uncredited)
Laura Graham ADR Editor
Kathryn Joosten Aunt Jackie
Elena Arroy Key Makeup Artist
Willie D. Burton Sound Mixer
Chris Warren Xander
Brando Eaton Jeremy
Anjelah Johnson-Reyes Julie
David Lucarelli Sound Recordist
John Murray Foley Supervisor
Juel Bestrop Casting
Galen Goodpaster First Assistant Sound Editor
Ross Bagdasarian Characters
Rebecca Robertson Script Supervisor
Julianne Jordan Music Supervisor
Jeff Carson Music Editor
Glenn Brown Steadicam Operator
Steven R. Mathis Gaffer
Archie Hahn Agent
Jake Zyrus Charice Pempengco
Cheri Minns Makeup Department Head
Guy Bar'ely Animation
Leigh Shanta Unit Production Manager
Dawn Fintor Foley Artist
Michael J. Benavente Supervising Sound Editor
Jesse Johnstone Sound Recordist
Richy Jackson Chipmunk Dancer
Paul Gonzales Charice Bassist (uncredited)
Casper Smart Dancer (uncredited)
Kevin G. Schmidt Ryan
Michael Keller Sound Re-Recording Mixer
Tim Gomillion Sound Recordist
Scott Curtis Foley Editor