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James Donald as Michael Heathley |
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Phyllis Calvert as Lydia Heathley |
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Noel Willman as Dr. Dennis Bord |
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Herbert Lom as Dr. Alex Leon |
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Robert Beatty as Maj. Sam Seagram |
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Patric Doonan as Brian Jackson |
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Walter Fitzgerald as Sir Charles Craddock |
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Muriel Pavlow as Caroline Cartier |
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Maurice Denham as Prof. Carrington |
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Marjorie Fielding as Michael's Mother |
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Herbert Lomas as George Jackson |
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Geoffrey Denton as Fisher |
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Cyril Chamberlain as Inspector Carter |
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Hal Osmond as Agent Lawson |
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Caven Watson as Dr. Ferguson |
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Marianne Stone as Maisie |
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Stanley Maxted as Prof. Adams |
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Hartley Power as General Adams (uncredited) |
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Philip Ray as Sentry (uncredited) |
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Johnnie Schofield as Jim Barnes (uncredited) |
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John Warren as Ted (uncredited) |
| Directing | Anthony Asquith | Director |
| Crew | Arthur Alcott | Production Controller |
| Production | Hugh Attwooll | Production Manager |
| Crew | Bryan Langley | Special Effects |
| Crew | Bill Warrington | Special Effects |
| Directing | Yvonne Axeworthy | Continuity |
| Sound | Muir Mathieson | Conductor |
| Camera | H. A. R. Thomson | Camera Operator |
| Directing | George Pollock | Assistant Director |
| Costume & Make-Up | W.T. Partleton | Makeup Artist |
| Crew | Albert Whitlock | Special Effects |
| Sound | Harry Miller | Sound Editor |
| Editing | Frederick Wilson | Editor |
| Camera | Desmond Dickinson | Director of Photography |
| Sound | Benjamin Frankel | Original Music Composer |
| Art | John Howell | Art Direction |
| Costume & Make-Up | Julie Harris | Costume Design |
| Sound | John Dennis | Sound Recordist |
| Production | Antony Darnborough | Producer |
| Production | Earl St. John | Executive Producer |
| Camera | Stanley Grant | Aerial Director of Photography |
| Sound | Gordon K. McCallum | Sound Recordist |
| Writing | William Fairchild | Screenplay |
| Writing | John Pudney | Writer |
