| 角色 | 饰演者介绍 |
| Sylvina Lawrence / Martina Lawrence | 伊丽莎白·伯格纳 |
| Alan MacKenzie | 迈克尔·雷德格瑞夫 |
| Thomas E. Lawrence | Wilfrid Lawson |
| Aunt Helen (as Mabel Terry Lewis) | Mabel Terry-Lewis |
| Morgan | Richard Ainley |
| Garrett | Kenneth Buckley |
| Old Pauliac (as Danielle Mendaille) | Daniel Mendaille |
| Doctor | Pierre Juvenet |
| Nurse | Stella Arbenina |
| Maturin | Kaye Seeley |
| Police Supt. Demangeon | Ernest Ferny |
| Clerk | Cot D'Ordan |
| Eileen (Sylvina's maid) | Dorice Fordred |
| Cook | Annie Esmond |
| Karal Anderson | Clement McCallin |
| Prof. Bardesley | Oliver Johnston |
| British Minister | Roy Russell |
| Mayor | Homer Regus |
| 'Boomsie' | An Old English Sheepdog |
| (uncredited) | Davina Carid |
| (uncredited) | Cyril Chamberlain |
| (uncredited) | O.B. Clarence |
| (uncredited) | Dorothy Dewhurst |
| (uncredited) | Cyril Horrocks |
| (uncredited) | Fewlass Llewellyn |
| (uncredited) | John Lloyd |
| (uncredited) | Gayenne Michaeldze |
| (uncredited) | Paulette Preney |
