Quatermass finds himself on the scene of an archaeological dig in a London tube station, where a rather unexpected object is found. He soon realises it's a relic from an old colonisation attempt several million years earlier. The invaders are long dead, but a compelling memory still lurks in Hob's Lane...
I first saw this film two decades ago, when I managed to record it off the TV, and soon wore out the video by watching it so often. It's a great example of its genre, and still superb today. The scientists are scientific, the army officer annoying, the plot marvellously constructed, and the effects a strange combination of the superb and the slightly ropey - exactly what you want from a classic sci-fi/Hammer adventure of the sixties. There's not a single scene or pseudo-fact out of place, and no extraneously irrelevant love interest getting in the way either. Even the film loop behind the end-titles is unsettling; to this day I can't decide what sort of ending the film has; "good" has triumphed, but at what cost?
All in all, a great film, and well worth watching. Five stars.