Casts
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)
Crews
Chuck Jones
Director
Ben Washam
Director
Dr. Seuss
Teleplay
Dr. Seuss
Producer
Carl Bell
Animation
George Nicholas
Animation
Tom Ray
Animation
Chuck Jones
Producer
Maurice Noble
Production Design
Ben Washam
Animation
Angel Esparza
Background Designer
Hal Ambro
Animation
Irven Spence
Animation
Phil Roman
Animation
Philip DeGuard
Background Designer
Irv Wyner
Background Designer
Eugene Poddany
Music
Richard Thompson
Animation
Don Foster
Graphic Designer
Don Morgan
Layout Supervisor
Dr. Seuss
Book