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