Quatermass and the Pit is a 1967 British science fiction horror film from Hammer Film Productions. It is a sequel to the earlier Hammer films The Quatermass Xperiment and Quatermass 2. Like its predecessors, it is based on a BBC Television serial, in this case Quatermass and the Pit, written by Nigel Kneale. The storyline, largely faithful to the original television production, centres on the discovery of ancient human remains buried at the site of an extension to the London Underground called Hobbs End. More shocking discoveries lead to the involvement of the space scientist Bernard Quatermass.

The Quatermass Xperiment is a 1955 British science fiction horror film from Hammer Film Productions, based on the 1953 BBC Television serial The Quatermass Experiment written by Nigel Kneale. The film was produced by Anthony Hinds, directed by Val Guest, and stars Brian Donlevy as the titular Professor Bernard Quatermass and Richard Wordsworth as the tormented Carroon. Jack Warner, David King-Wood, and Margia Dean appear in co-starring roles.