Quatermass II: Several years after the previous serial took place, Professor Quatermass is trying to perfect a dangerously unstable nuclear-powered rocket engine. After a disastrous test firing in Australia, his future son-in-law, Captain John Dillon, draws the Professor's attention to a strange hollow meteorite which interrupted an Army Training exercise.
Quatermass and The Pit: When a skull is found during building works at Knightsbridge, London, the work is halted in order that a full archaeological dig can proceed. The diggers delve deeper, finding more skulls, but also finding some form of tube-like shell made of a ceramic-like material. The Ministry of Defence believe it to be an unexploded bomb, but when they manage to dig inside the shell, dead insect-like creatures are found.