 | Charles Durning als Grandfather (voice) |
 | Miriam Flynn als (voice) |
 | Clive Revill als (voice) |
 | Joseph Cousins als (voice) |
 | Christopher Collins als Chief Yonkeroo (voice) |
| Dr. Seuss | Novel |
| Ralph Bakshi | Director |
| Glen Daum | Music |
| Brad Gunther | Editor |
| Dr. Seuss | Executive Producer |
| Ralph Bakshi | Producer |
| Dr. Seuss | Writer |
| Kent Butterworth | Animation Director |
| Dave Marshall | Animation Director |
| Kent Butterworth | Storyboard Artist |
| Tom Minton | Storyboard Artist |
| Dave Marshall | Storyboard Artist |
| Jim Reardon | Storyboard Artist |
| Mike Kazaleh | Layout |
| Chris Reccardi | Layout |
| Louise Zingarelli | Layout |
| Dr. Seuss | Lyricist |
