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Brian Donlevy as Prof. Bernard Quatermass |
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John Longden as Chief Inspector Lomax |
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William Franklyn as Dr. Tom Brand |
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Bryan Forbes as Marsh |
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Charles Lloyd Pack as Work Camp Manager Dawson |
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Tom Chatto as Vincent Broadhead, M.P. |
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John Van Eyssen as The Plant Tour Guide |
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Sidney James as Jimmy Hall |
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Percy Herbert as Paddy Gorman |
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Michael Ripper as Ernie the Bartender |
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John Rae as E. J. Macleod |
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Philipp Baird as Lab Assistant |
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Betty Impey as Kelly |
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Joyce Adams as Woman Member of Parliament |
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Edwin Richfield as Peterson |
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Vera Day as Sheila |
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Marianne Stone as Miss Beal |
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Jane Aird as Mrs. McLeod |
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Michael Balfour as Harry |
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John Stuart as The Police Commissioner |
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John Fabian as Intern |
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George Merritt as Super |
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Barry Lowe as Chris (uncredited) |
| Directing | Val Guest | Director |
| Writing | Nigel Kneale | Screenplay |
| Production | Michael Carreras | Executive Producer |
| Camera | Gerald Gibbs | Director of Photography |
| Writing | Val Guest | Screenplay |
| Production | Anthony Hinds | Producer |
| Costume & Make-Up | Philip Leakey | Makeup Artist |
| Art | Bernard Robinson | Art Direction |
| Editing | James Needs | Editor |
| Sound | James Bernard | Original Music Composer |
| Writing | Nigel Kneale | Teleplay |
| Crew | Bill Warrington | Special Effects |
| Crew | Henry Harris | Special Effects |
| Costume & Make-Up | Rene Coke | Wardrobe Supervisor |
| Directing | Don Weeks | Assistant Director |
| Sound | John Hollingsworth | Music Director |
| Crew | Frank George | Special Effects |
| Production | Anthony Nelson Keys | Production Supervisor |
| Production | John Workman | Production Manager |
| Crew | Brian Johnson | Special Effects Assistant |
