In Quatermass 2, Professor Quatermass, still shook up from London’s refusal to proceed with his project to colonize the Moon, is intrigued by the mysterious traces that have been showing up on his radar – meteorites crashing to the Earth! Following them where they should be landing, he finds a destroyed village, a mysterious factory too close to his designs for the Moon colony for comfort, and some strange, aerodynamic objects containing a mysterious, ammonia-based gas that infects one of his assistants. Officially, the factory is producing synthetic food; but despite the veil of secrecy surrounding it Quatermass succeeds in finding out it harbours aliens with deadly designs on the Earth…