| 角色 | 饰演者 | 角色介绍 |
| Prof. Bernard Quatermass | 布莱恩·唐莱维 | |
| Lomax (as John Longdon) | John Longden | |
| Jimmy Hall (as Sydney James) | 希德·詹姆斯 | |
| Marsh | 布莱恩·福布斯 | |
| Brand | William Franklyn | |
| Sheila | Vera Day | |
| Dawson | Charles Lloyd Pack | |
| Broadhead | Tom Chatto | |
| The P.R.O. | John Van Eyssen | |
| Gorman | Percy Herbert | |
| Ernie | Michael Ripper | |
| McLeod | John Rae | |
| Secretary | Marianne Stone | |
| Young Man | Ronald Wilson | |
| Mrs. McLeod | Jane Aird | |
| Kelly | Betty Impey | |
| Inspector | Lloyd Lamble | |
| Commissioner | John Stuart | |
| Banker | Gilbert Davis | |
| Woman MP | Joyce Adams | |
| Peterson | Edwin Richfield | |
| Michaels | Howard Williams | |
| Lab. Assistant (as Philip Baird) | Phillip Baird | |
| Lab. Assistant | Robert Raikes | |
| Intern | John Fabian | |
| Super | George Merritt | |
| Constable | Arthur Blake | |
| Harry | Michael Balfour | |
| Guard (uncredited) | Leslie Crawford | |
| First Man (uncredited) | Vernon Greeves | |
| Young Girl (uncredited) | Jan Holden | |
| Labour MP (uncredited) | Alastair Hunter | |
| Chris (uncredited) | Barry Lowe | |
| Drunk (uncredited) | Henry Rayner |
