cast
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Guy Rolfe
Dr. Mark Fenton
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Lisa Daniely
Lisa Durand
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Patricia Dainton
Sister Rogers
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Sydney Tafler
Wade
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Ballard Berkeley
Inspector Austin
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Anton Diffring
Edward Shroder
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Brian Worth
Geoffrey Terry
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Avice Landone
Mrs. Terry
- Eric Berry Col. Williams
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James Raglan
Sir Oliver Peters
- Alexis Chesnakov Ship's Captain
- Michael Golden Harrison
- Edward Dentith Sergeant Lewis
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Derek Aylward
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William Franklyn
Dr. Gillespie
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Desmond Llewelyn
Police Constable at Barrier