Directed by
| Chuck Jones | ||
| Ben Washam | ... | (co-director) |
Writing Credits
| Dr. Seuss | ... | (teleplay) |
Cast (in credits order) complete, awaiting verification
| 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) | |
| Rest of cast listed alphabetically: | |||
 |
Thurl Ravenscroft | ... | Wickersham Brother (voice) (uncredited) |
Produced by
| Chuck Jones | ... | producer |
| Dr. Seuss | ... | producer (as Ted Geisel) |
Music by
| Eugene Poddany | ||
Editing by
| Jim Faris | ||
Production Design by
| Maurice Noble | ||
Production Management
| Earl Jonas | ... | production manager |
Art Department
| Don Foster | ... | graphics |
| Chuck Jones | ... | storyboard artist |
| Bob Ogle | ... | storyboard artist |
Animation Department
| Hal Ambro | ... | animator |
| Carl Bell | ... | animator |
| Philip DeGuard | ... | background artist |
| Angel Esparza | ... | background artist |
| Don Morgan | ... | layout artist |
| George Nicholas | ... | animator |
| Tom Ray | ... | animator |
| Phil Roman | ... | animator (as Philip Roman) |
| Irven Spence | ... | animator (as Irv Spence) |
| Richard Thompson | ... | animator (as Dick Thompson) |
| Ben Washam | ... | animator |
| Irv Wyner | ... | background artist |
| Jerry Hathcock | ... | animator (uncredited) |
| Kitty Schoentag | ... | ink & paint artist (uncredited) |
| Don Towsley | ... | animator (uncredited) |
Music Department
| Eugene Poddany | ... | conductor / songs: music by |
| Dr. Seuss | ... | songs: lyrics by |
