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Originally comprising six half-hour episodes, it was the first science-fiction production to be written especially for an adult television audience.

Previous written-for-television efforts such as Stranger from Space ( 1951 – 52 ) were aimed at children, whereas adult entries into the genre were adapted from literary sources, such as R. U. R.

( 1938 and again in 1948 ) and The Time Machine ( 1949 ).

The serial was the first of four Quatermass productions to be screened on British television between 1953 and 1979.