A veterinarian who can communicate with animals travels abroad to search for a giant sea snail.
| Directing | Richard Fleischer | Director |
| Writing | Leslie Bricusse | Screenplay |
| Production | Mort Abrahams | Associate Producer |
| Sound | Leslie Bricusse | Original Music Composer |
| Camera | Robert Surtees | Director of Photography |
| Art | Ed Graves | Art Direction |
| Art | Mario Chiari | Production Design |
| Production | William Eckhardt | Unit Production Manager |
| Production | Jack Stubbs | Unit Production Manager |
| Art | Stuart A. Reiss | Set Decoration |
| Editing | Marjorie Fowler | Editor |
| Costume & Make-Up | Ray Aghayan | Costume Design |
| Production | Arthur P. Jacobs | Producer |
| Art | Jack Martin Smith | Art Direction |
| Art | Walter M. Scott | Set Decoration |
| Writing | Hugh Lofting | Novel |
| Editing | Samuel E. Beetley | Editor |
| Directing | Richard Lang | Assistant Director |
| Directing | Paddy Carpenter | Second Assistant Director |
| Directing | Ray Corbett | Second Assistant Director |
| Directing | June Santantonio | Script Supervisor |
| Sound | Leslie Bricusse | Songs |
