| Cast List | |||
| Atomic Scientist | John Handley | Jean Cassell (A Spy) | Ann Ward |
| Secretary | Gillian Mackie | Maid | Iris Bufton |
| Spy's Accomplice | Brenda Head | Detectives | Gerald Williams |
| Hotel Proprietor | Emma England | Roy Hadley | |
| ??? | Gwyneth Fry | ||
| Crew | |||
| Producer | ??? | Stage Manager | Sybil Wardle |
| Scenery | Spencer Yarnold | Assistant Stage Managers | Marion Poole |
| John Handley | Kay Collins | ||
| Prompter | Doreen Allatt | ||
Irene Yarnold, who had been cast in a leading role, was unfortunate enough to break her leg shortly before the play was due to start and had to be replaced at the last moment by Gwyneth Fry - stand in producer.
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