Générique complet
Horton
Jim Carrey
Horton (voice)
Steve Carell
Mayor (voice)
Carol Burnett
Kangaroo (voice)
Will Arnett
Vlad (voice)
Seth Rogen
Morton (voice)
Dan Fogler
Councilman / Yummo Wickersham (voice)
Isla Fisher
Dr. Mary Lou Larue (voice)
Jonah Hill
Tommy (voice)
Amy Poehler
Sally O'Malley (voice)
Jaime Pressly
Mrs. Quilligan (voice)
Charles Osgood
Narrator (voice)
Josh Flitter
Rudy (voice)
Niecy Nash-Betts
Miss Yelp (voice)
Jesse McCartney
JoJo (voice)
Shelby Adamowsky
Hedy / Hooly (voice)
Jack Angel
Old Time Who (voice)
Caitlin Rose Anderson
Helen (voice)
Emily Anderson
Heather (voice)
Jan Rabson
Town Cryer (voice)
John Cygan
Who (voice)
Jess Harnell
Another Who (voice)
Debi Derryberry
Who Mom (voice)
Samantha Droke
Hildy / Holly (voice)
Karen Disher
Who Kid (voice)
Marshall Efron
Wickersham Guard 1 (voice)
Bill Farmer
Willie Bear (voice)
Jason Fricchione
Joe (voice)
Heather Goldenhersh
Who Girl (voice)
Selena Gomez
Helga (voice)
Jimmy Hayward
Obnoxious Who (voice)
Joey King
Katie (voice)
Christina Martino
Heidi / Haley (voice)
Ellie Martino
Hanna (voice)
Laraine Newman
Glummox Mom (voice)
Tim Nordquist
Wickersham Guard 2 (voice)
Colleen O'Shaughnessey
Angela (voice)
Laura Ortiz
Jessica (voice)
Joe Pasquale
The Dentist (voice)
Connor Anderson
Who Child #1 (voice)
Isabella Acres
Additional Voices (voice)
Bob Bergen
Additional Voices (voice)
Jeff Biancalana
Additional Voices (voice)
Madison Davenport
Additional Voices (voice)
Teresa Ganzel
Additional Voices (voice)
Kathy Graves Toon
Additional Voice (voice)
Sherry Lynn
Additional Voices (voice)
Danny Mann
Additional Voices (voice)
Mona Marshall
Additional Voices (voice)
Mickie McGowan
Additional Voices (voice)
Madison Pettis
Additional Voices (voice)
Grace Rolek
Additional Voices (voice)
Jennessa Rose
Additional Voices (voice)
Ariel Winter
Additional Voices (voice)
Fletcher Sheridan
Jojo (singing voice) (uncredited)
Réalisation
Scénario
Ken Daurio
Scénario
Cinco Paul
Scénario
Ricardo Curtis
Head of Story
Dr. Seuss
Livre
Jon Vitti
Story Consultant
Cal Brunker
Story Artist
Chris Renaud
Story Artist
Jeff Biancalana
Story Artist
Jony Chandra
Story Artist
Karen Disher
Story Artist
Eric Favela
Story Artist
Martin Fuller
Story Artist
Moroni Taylor
Story Artist
Tony Maki
Story Artist
Rafael Zentil
Story Artist
William H. Frake III
Story Artist
Production
Bob Gordon
Production
Audrey Geisel
Production exécutive
Chris Meledandri
Production exécutive
Bruce Anderson
Production
Chris Wedge
Production exécutive
Christian Kaplan
Casting
Patrick Worlock
Production
Montage
Son et musique
John Powell
Musique
Dennis Leonard
Supervising Sound Editor
Tom Carlson
Supervising Music Editor
Randy Thom
Conception sonore, Supervising Sound Editor
Mac Smith
Sound Effects Editor
Décors
Edmund Fong
Additional Storyboarding
Frank Marino
Additional Storyboarding
Rich Moore
Additional Storyboarding
Crystal Chesney-Thompson
Additional Storyboarding
Wilbert Plijnaar
Additional Storyboarding
Stephanie Arnett
Additional Storyboarding
Jeff Siergey
Additional Storyboarding
Chris Gilligan
Additional Storyboarding
J.G. Quintel
Additional Storyboarding
Guillermo Willie Real
Set Designer
Michael Knapp
Set Designer
Kyle Macnaughton
Set Designer
Jake Parker
Set Designer
Nash Dunnigan
Set Designer
Thomas Cardone
Direction artistique
Lizette Vega
Set Designer
Marcin Jakubowski
Chef décorateur
Effets visuels
Paul Downs
Animation
Barry E. Jackson
Visual Development
Jamie Kirschenbaum
Senior Visual Effects Supervisor
Alen Lai
Senior Visual Effects Supervisor
Rhett Collier
Senior Visual Effects Supervisor
Simon Brown
Senior Visual Effects Supervisor
Michael Thurmeier
Visual Effects
Galen T. Chu
Visual Effects
Lumière
Arun Ram-Mohan
Lighting Artist
David Esneault
Lighting Director
Wesley Mandell
Lighting Artist
Scott Farrell
Lighting Artist