Quatermass and the Pit is a British television science-fiction serial transmitted live by BBC Television in December 1958 and January 1959. It was the third and last of the BBC's Quatermass serials, although the chief character, Professor Bernard Quatermass, reappeared in a 1979 ITV production called Quatermass. Like its predecessors, Quatermass and the Pit was written by Nigel Kneale.

Professor Bernard Quatermass is a fictional scientist originally created by writer Nigel Kneale for BBC Television. An intelligent and highly moral British scientist, Quatermass is a pioneer of the British space programme, heading the British Experimental Rocket Group. He continually finds himself confronting sinister alien forces that threaten to destroy humanity.