Quatermass 2 (1957)

Excellent science fiction horror thrills. Dr Quatermass (Brian Donlevy) is annoyed because Whitehall has canned his plans for a Moon base. Meanwhile, strange meteorites are landing in the countryside. When Quatermass goes to investigate, he discovers a secret base, just like his plans for a Moon base! His assistant (Brian Forbes) is afflicted by an exploding meteorite and suddenly strange men in masks appear and seize the assistant and send Quatermass packing...

Quatermass knows something weird is going on. He gains access to the base with the help of an MP (Tom Chatto) friend, but his friend dies covered in a bizarre substance and Quatermass narrowly avoids capture and probable zombification. 

With the help of another friend, Police Inspector Lomax (John Longden) and a reporter (Sid James), Quatermass tries to enlight the help of the men of a local village. At first they are hesitant, but when a local girl is hurt by a meteorite, they rise in rebellion and storm the base. Quatermass knows that an unimaginable alien horror lurks in the giant steel tanks...

Although the effects are dated of course the film is chilling, the Quatermass films were always able to portray inhuman horror and science terror perfectly.