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Charles Durning as Grandfather (voice) |
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Miriam Flynn as Yookie-Ann Sue /Teacher /Various Yooks (voice) |
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Clive Revill as Van Itch (voice) |
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Joseph Cousins as (voice) |
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Christopher Collins as Chief Yonkeroo (voice) |
| Directing | Ralph Bakshi | Director |
| Writing | Dr. Seuss | Novel |
| Sound | Glen Daum | Music |
| Editing | Brad Gunther | Editor |
| Production | Dr. Seuss | Executive Producer |
| Production | Ralph Bakshi | Producer |
| Writing | Dr. Seuss | Writer |
| Visual Effects | Kent Butterworth | Animation Director |
| Visual Effects | Dave Marshall | Animation Director |
| Art | Kent Butterworth | Storyboard Artist |
| Art | Tom Minton | Storyboard Artist |
| Art | Dave Marshall | Storyboard Artist |
| Art | Jim Reardon | Storyboard Artist |
| Directing | Mike Kazaleh | Layout |
| Directing | Chris Reccardi | Layout |
| Directing | Louise Zingarelli | Layout |
| Writing | Dr. Seuss | Lyricist |
