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Guy Rolfe as Dr. Mark Fenton |
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Lisa Daniely as Lisa Durand |
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Patricia Dainton as Sister Rogers |
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Sydney Tafler as Wade |
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Ballard Berkeley as Inspector Austin |
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Anton Diffring as Edward Shroder |
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Brian Worth as Geoffrey Terry |
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Avice Landone as Mrs. Terry |
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Eric Berry as Col. Williams |
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James Raglan as Sir Oliver Peters |
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Alexis Chesnakov as Ship's Captain |
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Michael Golden as Harrison |
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Edward Dentith as Sergeant Lewis |
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Derek Aylward as |
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William Franklyn as Dr. Gillespie |
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Desmond Llewelyn as Police Constable at Barrier |
| Directing | John Guillermin | Director |
| Directing | Denis Johnson | Assistant Director |
| Writing | Francis Durbridge | Story |
| Writing | A.R. Rawlinson | Writer |
| Writing | John Guillermin | Writer |
