I finally got to see Quatermass II, or as it's know in these United States -- Enemy from Space. This is the Hammer Films feature version of the vintage British TV Quatermass series which tells a tale which evokes classic yarns like Invasion of the Body Snatchers and other subtle alien invasion movies. Brian Donlevy is the cantankerous Professor Quatermass, a rocket scientist who is struggling to keep his rocket project up and running as his team gets wind of another secret project which seems to be getting all of the government's funds. They are led to it by mysterious objects which have fallen from space and when handled break open release a gas and and agent which dominates the mind and spirit of a human host.
The story is a complicated story in which against all odds Quatermass is able to penetrate the secret base operated by the hidden aliens and attempts to frustrate their efforts to transform Earth's atmosphere to suit their own needs. There's lots of mayhem and typical of a British sci-fi effort, a lot of death before it's all said and done. I don't love the plot of this story, especially at the end since so much of the solution is happenstance, but there's no denying the bravery of a few souls who give all to save this island Earth.
Quatermass II was preceded of course by The Quatermass Xperiment otherwise called The Creeping Unknown. This earlier tale has a rocket return to Earth which brings back one living astronaut who has been infected by alien spores which are slowly transforming him from a human into something else, something which poses a threat to all mankind. The story is for most of its telling a taught story in which the authorities are chasing after the escaped astronaut who slowly changes and murders as he does so.