The following is the cast of characters along with the name of the actor playing them.
| Dr. Armstrong | Lynn Morgan | William Blore | Neil Crabbe | |
| Emily Brent | Katy Ball | Vera Claythorne | Maria Bettridge | |
| General Mackenzie | John Banner | Philip Lombard | Alan Williams | |
| Anthony Marston | Alex Forty | Narracott | Jay Caldwell | |
| Mrs Rogers | Maggie Patten | Rogers | Don Williams | |
| Sir Lawrence Wargrave | Pete Hollis |
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