In the heart of London, during excavations for the subway extension, workers unearth a strange buried capsule that awakens a deep mystery. As the discovery is investigated, Professor Quatermass, an enigmatic and skeptical scientist, becomes embroiled in a series of unsettling events that challenge his intelligence and beliefs. The capsule turns out to be of extraterrestrial origin, and upon opening it, forces are released that disturb the psyche of those who approach.
With the city on the verge of panic, a series of terrifying visions and episodes of madness begin to plague the population, connecting its victims to a dark past of violence and superstition. Quatermass and his team must decipher the secrets of the capsule and its connection to humanity's ancient history before the situation spirals even further out of control. During their investigation, a story unfolds about aliens who have manipulated humanity throughout the centuries, questioning the very nature of our existence.
With a blend of science fiction and psychological horror, Quatermass faces not only an external threat that could spell the end for humanity, but also internal demons that unravel the fragility of the human mind. As desperation mounts and time is against him, Quatermass is compelled to act to save London from impending disaster. Will he manage to uncover the truth in time?