Hans Conried
Narrator / Horton / Dr. H. Hoovey (voice)
June Foray
Jane Kangaroo / Mother Who / Baby Who / Cindy Lou Who (voice)
Chuck Jones
Junior Kangaroo / Various Whos / Quizmo McKwoff / JoJo (voice)
Thurl Ravenscroft
Wickersham Brother (voice) (uncredited)
Angel Esparza
Background Designer
Irv Wyner
Philip DeGuard
Don Foster
Graphic Designer
Maurice Noble
Production Design
Ben Washam
Director
Producer
Dr. Seuss
Eugene Poddany
Music
Animation
Carl Bell
George Nicholas
Hal Ambro
Irven Spence
Phil Roman
Richard Thompson
Tom Ray
Don Morgan
Layout Supervisor
Teleplay
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