After their prison ship sinks in the Caribbean, a group of prisoners and a doctor wash ashore on a seemingly deserted island. They soon discover a strange couple, who invite them to stay at their house. While the prisoners plan an escape, the doctor does some investigating, and soon finds out just what the pair are really doing, and why the prisoners keep disappearing mysteriously.
Unfortunately the movie Island of the Fishmen is not yet available on HBO Max.
| Directing | Sergio Martino | Director |
| Writing | Sergio Donati | Screenplay |
| Sound | Luciano Michelini | Original Music Composer |
| Camera | Giancarlo Ferrando | Director of Photography |
| Writing | Cesare Frugoni | Screenplay |
| Writing | Sergio Martino | Screenplay |
| Production | Luciano Martino | Producer |
| Writing | Cesare Frugoni | Story |
| Editing | Eugenio Alabiso | Editor |
| Writing | Luciano Martino | Story |
| Costume & Make-Up | Maria Rosaria Crimi | Costume Design |
| Art | Massimo Antonello Geleng | Production Design |
| Sound | Bruno Moreal | Sound Mixer |
| Costume & Make-Up | Mark Walas | Assistant Makeup Artist |
| Directing | Steve Jerrom | Second Assistant Director |
| Production | Roger Corman | Executive Producer |
| Costume & Make-Up | Nilo Jacoponi | Makeup Artist |
| Costume & Make-Up | Manlio Rocchetti | Makeup Artist |
| Costume & Make-Up | Kenny Myers | Assistant Makeup Artist |
| Costume & Make-Up | Stefano Trani | Makeup Artist |
| Costume & Make-Up | Chris Walas | Special Effects Makeup Artist |
| Sound | Roberto Petrozzi | Sound Engineer |
| Costume & Make-Up | Pamela Peitzman | Makeup Artist |
