When scientists exploring the Amazon River stumble on a “missing link” connecting humans and fish, they plan to capture it for later study. But the Creature has plans of his own, and has set his sights on the lead scientist's beautiful fiancée, Kay.
| Sound | Herman Stein | Original Music Composer |
| Editing | Ted J. Kent | Editor |
| Directing | Jack Arnold | Director |
| Writing | Harry Essex | Screenplay |
| Sound | Henry Mancini | Original Music Composer |
| Production | William Alland | Producer |
| Camera | William E. Snyder | Director of Photography |
| Writing | Arthur A. Ross | Screenplay |
| Sound | Hans J. Salter | Original Music Composer |
| Costume & Make-Up | Bud Westmore | Makeup Artist |
| Writing | Maurice Zimm | Story |
| Costume & Make-Up | Joan St. Oegger | Hairstylist |
| Art | Ray Jeffers | Set Decoration |
| Art | Hilyard M. Brown | Art Direction |
| Art | Russell A. Gausman | Set Decoration |
| Art | Bernard Herzbrun | Art Direction |
| Sound | Leslie I. Carey | Sound |
| Sound | Joe Lapis | Sound |
| Costume & Make-Up | E. Thomas Case | Makeup Artist |
| Directing | Fred Frank | Assistant Director |
| Sound | Joseph Gershenson | Music Director |
| Visual Effects | Milicent Patrick | Creature Design |
| Costume & Make-Up | Milicent Patrick | Makeup Designer |
| Crew | Polly Burson | Stunt Double |
| Costume & Make-Up | Robert Hickman | Makeup Artist |
| Costume & Make-Up | Jack Kevan | Makeup Artist |
| Costume & Make-Up | Chris Mueller | Makeup Artist |
| Sound | Ray Craddock | Sound Editor |
| Sound | Albert E. Kennedy | Sound Editor |
| Writing | William Alland | Idea |
| Production | Foster Thompson | Unit Manager |
| Directing | Russ Haverick | Assistant Director |
| Crew | Gene Poole | Stunts |
| Crew | Ginger Stanley | Stunts |
| Crew | Ted White | Stunts |
| Crew | Al Wyatt Sr. | Stunts |
| Crew | Jack N. Young | Stunts |
| Camera | Everett Brown | Grip |
| Sound | Ethmer Roten | Musician |
| Crew | James R. Wolfe | Driver |
| Camera | Scotty Welbourne | Still Photographer |
| Sound | Robert Emmett Dolan | Music |
| Sound | Milton Rosen | Music |
| Camera | James Curtis Havens | Underwater Camera |
