Alvin (voice)

Justin Long

Toby

Zachary Levi

Ian

David Cross

Simon (voice)

Matthew Gray Gubler

Theodore (voice)

Jesse McCartney

Dave

Jason Lee

Eleanor (voice)

Amy Poehler

Jeanette (voice)

Anna Faris

Brittany (voice)

Christina Applegate

Digger the NASCAR Gopher (voice)

Eric Bauza

Meerkat Manor Narrator (voice)

Sean Astin

Dr. Rubin

Wendie Malick

Julie

Anjelah Johnson

Aunt Jackie

Kathryn Joosten

Ryan

Kevin G. Schmidt

Xander

Chris Warren Jr.

Ryan

Kevin Schmidt

Becca

Bridgit Mendler

Emily

Aimee Carrero

Valentina

Alexandra Shipp

Emcee

Gregg Binkley

Charice Pempengco

Jake Zyrus

Doctor

Bernard White

Herself

Charice Pempengco

Nurse

Adele Jacques

Airline Rep

Joy Osmanski

Agent

Archie Hahn

Paramedic

Lanny Joon

Jeremy

Brando Eaton

Honor Society

Michael Bruno

Honor Society

Andrew Lee Schmidt

Honor Society

Alexander Noyes

Andrew Lee

Honor Society

Jason Rosen

Screaming Fan

Ali Mikles

Chipmunk Dancer

Marty Dew

Richard Jackson

Chipmunk Dancer

Mihran Kirakosian

Chipmunk Dancer

Richy Jackson

Chipette Dancer

Janelle Ginestra

Chipette Dancer

Thomasina Gross

Chipette Dancer

Rachele Smith

Daniel Ryan Conferido

Li'l Rosero Dancer

Ryan Feng

Li'l Rosero Dancer

Ryan Conferido

Li'l Rosero Dancer

Brian Hirano

Li'l Rosero Dancer

Hokuto 'Hok' Konishi

Li'l Rosero Dancer

Victor Kim

Hokuto Konishi

Li'l Rosero Dancer

Dominic Sandoval

Steven Terada

Li'l Rosero Dancer

Steve Terada

Agent

Archie Hahn III

Theodore

Janice Karman