A captain and his sailors investigate the rampaging "Marsh Phantoms" terrorizing a coastal town, but their search is hindered by a local reverend and a horrifying curse.
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| Directing | Peter Graham Scott | Director |
| Writing | Russell Thorndike | Novel |
| Crew | Barbara S. Harper | Additional Dialogue |
| Writing | Anthony Hinds | Screenplay |
| Production | John Temple-Smith | Producer |
| Sound | Don Banks | Original Music Composer |
| Camera | Arthur Grant | Director of Photography |
| Editing | Eric Boyd-Perkins | Editor |
| Art | Bernard Robinson | Production Design |
| Art | Don Mingaye | Art Direction |
| Costume & Make-Up | Roy Ashton | Makeup Artist |
| Costume & Make-Up | Frieda Steiger | Hairstylist |
| Production | Don Weeks | Production Manager |
| Directing | John Peverall | Assistant Director |
| Directing | Peter Medak | Second Assistant Director |
| Art | Arthur Banks | Construction Manager |
| Art | Lawrence Wren | Painter |
| Sound | Jock May | Sound Recordist |
| Sound | Terry Poulton | Sound Editor |
| Crew | Les Bowie | Special Effects |
| Crew | Brian Johnson | Special Effects Assistant |
| Crew | Ian Scoones | Special Effects Assistant |
| Crew | Paddy Hayes | Stunts |
| Camera | Len Harris | Camera Operator |
| Lighting | Jack Curtis | Electrician |
| Camera | Tom Edwards | Still Photographer |
| Camera | Harry Oakes | Focus Puller |
| Costume & Make-Up | Molly Arbuthnot | Wardrobe Supervisor |
| Costume & Make-Up | Rosemary Burrows | Wardrobe Master |
| Editing | James Needs | Supervising Editor |
| Editing | Chris Barnes | Assistant Editor |
| Sound | Philip Martell | Music Director |
| Directing | Tilly Day | Continuity |
