 | Barry Jones als Professor John Malcolm Francis Willingdon |
 | André Morell als Superintendent G.W. Folland |
 | Olive Sloane als Goldie Phillips |
 | Sheila Manahan als Ann Willingdon |
 | Hugh Cross als Stephen Lane |
 | Joan Hickson als Mrs. Emily Georgina Peckett |
 | Ronald Adam als Arthur Lytton, the Prime Minister |
 | Marie Ney als Mrs. Willingdon |
 | Joss Ackland als Station Policeman |
 | Marianne Stone als Woman in Phone Box |
 | John Stratton als Army Mechanic |
| Roy Boulting | Director |
| John Boulting | Director |
| John Boulting | Producer |
| Roy Boulting | Producer |
| John Addison | Original Music Composer |
| Shirley Barnes | Continuity |
| Dorothy Holloway | Casting |
| Gilbert Taylor | Director of Photography |
| James Bernard | Story |
| Roy Boulting | Screenplay |
| Frank Harvey | Screenplay |
| Honoria Plesch | Costume Design |
| Paul Dehn | Story |
| Eric Cass | Boom Operator |
| Ray Sturgess | Camera Operator |
| John Elphick | Production Design |
| Peter De Sarigny | Associate Producer |
| John Palmer | Production Manager |
| Mike Johnson | Assistant Director |
| Robert Huke | Camera Operator |
| Gerald Moss | Camera Operator |
| Dennis Fox | Camera Operator |
| Bert Ross | Sound Recordist |
| U. P. Hutchinson | Makeup Artist |
| Bert Eggleton | Sound Editor |
| Ann Chegwidden | Assistant Sound Editor |
| Hubert Clifford | Conductor |
| John Boulting | Editor |
| Roy Boulting | Editor |
