 | Bob Newhart als Bernard (voice) |
 | Eva Gabor als Miss Bianca (voice) |
 | Geraldine Page als Madame Medusa (voice) |
 | Joe Flynn als Mr. Snoops (voice) |
 | Jeanette Nolan als Ellie Mae (voice) |
 | Pat Buttram als Luke (voice) |
 | Jim Jordan als Orville (voice) |
 | John McIntire als Rufus (voice) |
 | Michelle Stacy als Penny (voice) |
 | Bernard Fox als The Chairman (voice) |
 | Larry Clemmons als Gramps (voice) |
 | James MacDonald als Evinrude / Brutus / Nero (voice) |
 | George Lindsey als Rabbit (voice) |
| Bill McMillian als TV Announcer (voice) |
 | Dub Taylor als Digger (voice) |
 | John Fiedler als Owl (voice) |
 | Robie Lester als Miss Bianca (singing voice, uncredited) |
 | Mel Blanc als Bats (voice) (uncredited) |
 | Peter Renaday als American Deligate (voice) (uncredited) |
| David Michener | Author |
| Ted Berman | Author |
| John Lounsbery | Director |
| Ken Anderson | Author |
| Artie Butler | Original Music Composer |
| Art Stevens | Director |
| Dick Sebast | Author |
| Larry Clemmons | Author |
| Ron Miller | Executive Producer |
| Margery Sharp | Novel |
| Fred Lucky | Author |
| Wolfgang Reitherman | Producer |
| Frank Thomas | Author |
| Vance Gerry | Author |
| Burny Mattinson | Author |
| James Koford | Editor |
| Wolfgang Reitherman | Director |
| James Melton | Editor |
| Frank Thomas | Animation |
| Milt Kahl | Animation |
| Ollie Johnston | Animation |
| Herb Taylor | Sound Supervisor |
| Carol Connors | Songs |
| Ayn Robbins | Songs |
| Sammy Fain | Songs |
