Casting Horton
Acteurs et actrices
Bill Farmer
Rôle : Willie Bear / Additional Voices (voice)
Steve Carell
Rôle : The Mayor of Whoville (voice)
Jim Carrey
Rôle : Horton (voice)
Carol Burnett
Rôle : Kangaroo (voice)
Will Arnett
Rôle : Vlad (voice)
Seth Rogen
Rôle : Morton (voice)
Isla Fisher
Rôle : Dr. Mary Lou Larue (voice)
Jonah Hill
Rôle : Tommy (voice)
Et aussi :
- Councilman / Yummo Wickersham (voice) Councilman / Yummo Wickersham (voice) Dan Fogler
- Sally O'Malley (voice) Sally O'Malley (voice) Amy Poehler
- Mrs. Quilligan (voice) Mrs. Quilligan (voice) Jaime Pressly
- Narrator (voice) Narrator (voice) Charles Osgood
- Rudy (voice) Rudy (voice) Josh Flitter
- Additional Voices (voice) Additional Voices (voice) Ariel Winter
- Miss Yelp (voice) Miss Yelp (voice) Niecy Nash
- JoJo (voice) JoJo (voice) Jesse McCartney
- Hedy / Hooly / Additional Voices (voice) Hedy / Hooly / Additional Voices (voice) Shelby Adamowsky
- Old Time Who / Additional Voices (voice) Old Time Who / Additional Voices (voice) I Jack Angel
- Helen (voice) Helen (voice) Caitlin Rose Anderson
- Heather (voice) Heather (voice) Emily Anderson
- Town Cryer / Additional Voices (voice) Town Cryer / Additional Voices (voice) Jan Rabson
- Who / Additional Voices (voice) Who / Additional Voices (voice) John Cygan
- Another Who / Additional Voices (voice) Another Who / Additional Voices (voice) Jess Harnell
- Who Mom / Additional Voices (voice) Who Mom / Additional Voices (voice) Debi Derryberry
- Hildy / Holly (voice) Hildy / Holly (voice) Samantha Droke
- Who Kid (voice) Who Kid (voice) Karen Disher
- Wickersham Guard 1 (voice) Wickersham Guard 1 (voice) Marshall Efron
- Joe (voice) Joe (voice) Jason Fricchione
- Who Girl / Additional Voices (voice) Who Girl / Additional Voices (voice) Heather Goldenhersh
- Helga (voice) Helga (voice) Selena Gomez
- Obnoxious Who (voice) Obnoxious Who (voice) Jimmy Hayward
- Katie (voice) Katie (voice) Joey King
- Heidi / Haley (voice) Heidi / Haley (voice) Christina Martino
- Hanna / Additional Voices (voice) Hanna / Additional Voices (voice) Ellie Martino
- Glummox Mom / Additional Voices (voice) Glummox Mom / Additional Voices (voice) Laraine Newman
- Wickersham Guard 2 (voice) Wickersham Guard 2 (voice) Tim Nordquist
- Angela / Additional Voices (voice) Angela / Additional Voices (voice) Colleen O'Shaughnessey
- Jessica (voice) Jessica (voice) Laura Ortiz
- The Dentist (voice) The Dentist (voice) Joe Pasquale
- Who Child #1 (voice) Who Child #1 (voice) Connor Anderson
- Additional Voices (voice) Additional Voices (voice) Isabella Acres
- Additional Voices (voice) Additional Voices (voice) Bob Bergen
- Additional Voices (voice) Additional Voices (voice) Jeff Biancalana
- Additional Voices (voice) Additional Voices (voice) Madison Davenport
- Additional Voices (voice) Additional Voices (voice) Teresa Ganzel
- Additional Voice (voice) Additional Voice (voice) Kathy Graves Toon
- Additional Voices (voice) Additional Voices (voice) Sherry Lynn
- Additional Voice (voice) Additional Voice (voice) Sherry Lynn
- Additional Voices (voice) Additional Voices (voice) Danny Mann
- Additional Voices (voice) Additional Voices (voice) Mona Marshall
- Additional Voices (voice) Additional Voices (voice) Mickie McGowan
- Additional Voices (voice) Additional Voices (voice) Madison Pettis
- Additional Voices (voice) Additional Voices (voice) Grace Rolek
- Additional Voices (voice) Additional Voices (voice) Jennessa Rose
Réalisateurs
Jimmy Hayward
Rôle : Director
Steve Martino
Rôle : Director
Scénaristes
Ken Daurio
Rôle : Screenplay
Cinco Paul
Rôle : Screenplay
Jeff Siergey
Rôle : Writer
Producteurs
Chris Wedge
Rôle : Executive Producer
Christopher Meledandri
Rôle : Executive Producer
Bob Gordon
Rôle : Producer
Bruce Anderson
Rôle : Producer
Audrey Geisel
Rôle : Executive Producer