Horton (voice)
Mayor (voice)
Kangaroo (voice)
Vlad (voice)
Morton (voice)
Councilman / Yummo Wickersham (voice)
Dr. Mary Lou Larue (voice)
Tommy (voice)
Sally O'Malley (voice)
Mrs. Quilligan (voice)
Narrator (voice)
Rudy (voice)
Miss Yelp (voice)
JoJo (voice)
Hedy / Hooly (voice)
Old Time Who (voice)
Helen (voice)
Heather (voice)
Town Cryer (voice)
Who (voice)
Another Who (voice)
Who Mom (voice)
Hildy / Holly (voice)
Who Kid (voice)
Wickersham Guard 1 (voice)
Willie Bear (voice)
Joe (voice)
Who Girl (voice)
Helga (voice)
Obnoxious Who (voice)
Katie (voice)
Heidi / Haley (voice)
Hanna (voice)
Glummox Mom (voice)
Wickersham Guard 2 (voice)
Angela (voice)
Jessica (voice)
The Dentist (voice)
Who Child #1 (voice)
Additional Voices (voice)
Additional Voice (voice)
Jojo (singing voice) (uncredited)
Executive Producer
Producer
Casting
Screenplay
Book
Head of Story
Director
Editor
Original Music Composer
Sound Designer
Supervising Sound Editor
Supervising Music Editor
Lighting Artist
Lighting Director
Post Production Supervisor
Schedule Coordinator
Visual Development
Senior Visual Effects Supervisor
Animation
Storyboard Artist
Art Direction
Set Designer
Additional Storyboarding
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