The Quatermass Xperiment
1955 film by Val Guest
The Quatermass Xperiment (released as The Creeping Unknown in the United States) is a 1955 British science-fiction horror film from Hammer Film Productions, based on the 1953 BBC Television serial The Quatermass Experiment written by Nigel Kneale. The film was directed and co-written by Val Guest, produced by Anthony Hinds, and stars Brian Donlevy as the titular Professor Bernard Quatermass and Richard Wordsworth as the tormented astronaut Carroon. Jack Warner, David King-Wood, and Margia Dean appear in co-starring roles.
The film concerns three astronauts who have been launched into space aboard a single-stage-to-orbit rocket designed by Professor Quatermass. It crashlands with only one of its original crew, Victor Carroon (Wordsworth), still aboard. He begins mutating into an alien organism, which, if it spawns, will engulf the Earth and destroy humanity. After Carroon escapes from custody Quatermass and Inspector Lomax (Warner) of Scotland Yard have just hours to track him/it down and prevent a catastrophe.
Like its source TV serial, the film was a major success, especially in the UK. It also brought public attention to Hammer Film Productions around the world. A sequel, Quatermass 2, followed in 1957.
Plot
The British-American Rocket Group, headed by Professor Bernard Quatermass, launches its first crewed rocket into outer space.
Begin with the source’s own compact description: “The Quatermass Xperiment” is 1955 film by Val Guest. The dossier treats that line as a proposition to test through Quatermass, Xperiment and film, not as a finished interpretation.
Why this record matters
The phrase “1955 film by Val Guest” supplies a clear boundary for inquiry. It also exposes the unanswered questions: who defined that boundary, when it became stable and which sources sit outside it.
Reception evidence should be dated and situated: later canonical status may differ sharply from the work’s initial circulation. The source revision retrieved here is dated Sep 14, 2026. The linked authority identifier is Q1683913. 1 of 2 selected statements include explicit references; 1 carry qualifiers and 0 use preferred rank. The first chronological checks are 1955, 1953 and 1957.
Later fame can flatten the distinction between original context, subsequent adaptation and institutional collecting history. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.
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The original object or edition, catalogue raisonné, performance record, rights file and holding institution.
Three-step research path
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This entry incorporates text from “The Quatermass Xperiment” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.