Réalisateur
Willie Bear / Additional Voices (voice)
Horton (voix française)
Horton (voix originale)
Le maire de Zouville (voix originale)
Kangaroo (voice)
Vlad (voice)
Morton (voice)
Dr. Mary Lou Larue (voice)
Tommy (voice)
Councilman / Yummo Wickersham (voice)
Sally O'Malley (voice)
Mrs. Quilligan (voice)
Additional Voices (voice)
Miss Yelp (voice)
JoJo (voice)
Old Time Who / Additional Voices (voice)
Who / Additional Voices (voice)
Another Who / Additional Voices (voice)
Who Mom / Additional Voices (voice)