A double bill of films based on the BBC plays by Nigel Keane.
In 'The Quatermass Xperiment' (1955), at the dawn of the space age the British Rocket Group launches three astronauts on an experimental mission.
Their ship, Quatermass 1, loses radio contact with Earth and later crash-lands.
Professor Bernard Quatermass (Brian Donlevy) is one of the first on the scene, and is intrigued to discover that two of the crew are no longer aboard.
It soon becomes clear that the mission's sole survivor, Victor Carroon (Richard Wordsworth), is desperately ill - he is rapidly consumed by the parasitic alien organism that killed his fellow astronauts.
In the sequel, 'Quatermass 2' (1957), strange metallic meteorites rain down over Winnerden Flats, an eerie new town in the vicinity of a highly guarded chemical plant.
Professor Quatermass (Donlevy) is intrigued to discover that contact with the meteorites causes an unusual infection, and is astonished to find that the chemical plant appears to be modelled after his own design for a moonbase - a design that enables life to thrive in an artificial atmosphere.
Quatermass's investigation uncovers a sinister conspiracy that extends from government level to the zombie-like workers who will stop at nothing to protect the plant.