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A building site on Hobbs Lane in London unearths 5 million year old human skull. Quartermass investigates, but the investigation is merged with the military when a strange projectile is uncovered.

Col. Breen believes the projectile is a bomb - it's cold to the touch, slightly radioactive and made of an unknown substance, Roney's assistant Barbara Judd finds the area has a history of supernatural events, and a terrified Pte West claims to have seen an imp-like ghost: 'It went through the wall!'.

Journalist James Fullalove helps Quatermass research the history of Hobbs Lane, finding its name derives from Hob - the devil. A technician, Sladden, succeeds in opening a sealed compartment in the capsule, revealing three petrified alien insects.

Roney and Quatermass develop their theory about the Martians' visit to Earth, instilling their essence into man's ancestors, Sladden, alone in the pit, flees in terror as strange forces are conjured up.

A brain scanner reveals alien pictures in Barbara Judd's mind of 'the Wild Hunt' -the frenetic purging of the Martian hives. In the pit, a technician is killed as the capsule starts to glow.

Chaos reigns in the pit and the long-dormant Martian inheritance begins to assert itself in many people in the area - including Quatermass himself - driving them to a new racial purge, The capsule breaks open and an energy form rises up over London. Roney finds he is immune and strives to defeat it.