Milquetoast Henry Limpet experiences his fondest wish and is transformed into a fish. As a talking fish he assists the US Navy in hunting German submarines during World War II.
| Writing | Jameson Brewer | Screenplay |
| Writing | John C. Rose | Screenplay |
| Writing | Joe DiMona | Adaptation |
| Writing | Theodore Pratt | Novel |
| Directing | Arthur Lubin | Director |
| Writing | John W. Dunn | Story Supervisor |
| Visual Effects | Gerry Chiniquy | Animation Director |
| Visual Effects | Robert McKimson | Animation Director |
| Visual Effects | Hawley Pratt | Animation Director |
| Visual Effects | Bill Tytla | Animation Director |
| Production | John C. Rose | Producer |
| Sound | Frank Perkins | Music |
| Camera | Harold E. Stine | Director of Photography |
| Editing | Donald Tait | Editor |
| Art | LeRoy Deane | Art Direction |
| Art | William L. Kuehl | Set Decoration |
| Costume & Make-Up | Gordon Bau | Makeup Supervisor |
| Costume & Make-Up | Jean Burt Reilly | Hairstylist |
| Costume & Make-Up | Bill Phillips | Makeup Artist |
| Costume & Make-Up | Louis Phillips | Makeup Artist |
| Costume & Make-Up | Lenore Weaver | Hairstylist |
| Directing | Sergei Petschnikoff | Assistant Director |
| Directing | Edmond F. Bernoudy | Assistant Director |
| Directing | Ira Stewart | Assistant Director |
| Sound | Stanley Jones | Sound |
| Lighting | Paul Burnett | Gaffer |
