During excavations in a London Underground station, a large unidentified object is uncovered.
Nobody knows what it is, but the area has always been associated with diabolical evil, so the army cordon off the site and call in Professor Quatermass to find out.
Quatermass discovers the remains of intelligent alien creatures that had attempted to conquer Earth in prehistoric times and, through their experiences with early man, altered human evolution to its present state.
Though dormant for many centuries, the power supply from the excavations is being drained by the alien ship until its terrifying force can once more be unleashed and the creatures can reinstate their dominance over man!
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