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John Bentley as Superintendent Wills |
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Patrick Allen as Dr. Nelson Pollard |
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Jacqueline Ellis as Elsa Marlowe |
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Wilfrid Brambell as Lock-Keeper |
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John Glyn-Jones as Dr. Maurice Tarn |
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Jane Murdoch as Honeymoon Wife |
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Brian McDermott as Det. Sgt. Stillman |
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Gerald Andersen as Major Paul Amery |
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Edward Atienza as Clerk |
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Ric Young as Johnny Choto |
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Robert Lee as Mr. Nam Lee |
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Yvonne Buckingham as Miss Russell |
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William Gaunt as Mitch Hallam |
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Michael Deacon as Angus |
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Arnold Lee as Soyoki |
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John Horsley as Pathologist |
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Lesley Nunnerley as Vera Martin |
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Malcolm Russell as Joe Martin |
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Yvonne Shima as Tamaya |
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Keith Faulkner as Lock-keeper's Assistant |
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Myo Toon as 1st Chinese Man |
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Sano Wong as 2nd Chinese Man |
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Burt Kwouk as Captain Feng |
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Timothy Parkes as Honeymoon Husband |
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Howard Pays as Police Sgt. |
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Peter Hager as Warden |
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Don McKillop as Reporter |
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Robert Russell as Uniformed Sgt. |
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Steve Reagan as Police Constable |
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Ping Ping Sam as Instructor in Gym |
| Directing | Clive Donner | Director |
| Writing | Edgar Wallace | Novel |
| Crew | Bert Mason | Cinematography |
| Art | Peter Mullins | Art Direction |
| Editing | Derek Holding | Editor |
| Writing | Robert Banks Stewart | Writer |
| Sound | Charles Blackwell | Original Music Composer |
| Production | Jim O'Connolly | Associate Producer |
| Production | Jack Greenwood | Producer |
| Production | Ronnie Curtis | Casting Director |
| Costume & Make-Up | Hilda Fox | Hairdresser |
| Costume & Make-Up | Aldo Manganaro | Makeup Artist |
| Production | Joe Levy | Production Manager |
| Directing | Bert Pearl | Assistant Director |
| Sound | Ronald Abbott | Sound Recordist |
| Sound | Michael Shah Dayan | Sound Editor |
| Sound | Sidney Rider | Sound Recordist |
| Camera | Herbert Smith | Camera Operator |
| Costume & Make-Up | Eileen Welch | Wardrobe Supervisor |
