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Dermot Walsh as Guy Thornton |
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Hazel Court as Margaret Thornton |
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Joss Ambler as Yacht Port Manager |
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Hugh Burden as Dr. Fawcett |
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Mignon O'Doherty as Mrs. Manley |
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Hugh Latimer as Peter |
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Joan Carol as Mrs. Martineau |
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John Robinson as Prof. Martineau / Mansel |
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Joss Ackland as Ron, 2nd Fisherman |
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John King-Kelly as Sid, 3rd Fisherman |
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Laidman Browne as Coroner |
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Meadows White as Mr. Leech, Surveyor |
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Patricia Owens as Party Girl (Joyce) |
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Melissa Stribling as Party Girl (Vera) |
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Ian Carmichael as Bernard |
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Geoffrey Dunn as Strange Passenger |
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Pat McGrath as Bert, 1st Fisherman |
| Editing | Francis Beiber | Editor |
| Writing | Vernon Sewell | Writer |
| Writing | Philip Thornton | Dialogue |
| Directing | Vernon Sewell | Director |
| Production | Henry Geddes | Associate Producer |
| Art | George Haslam | Art Direction |
| Crew | R.G.W. Smith | Sound Recordist |
| Camera | Stanley Grant | Director of Photography |
| Sound | Eric Spear | Original Music Composer |
