Quatermass and The Pit | Episode 5

Scientists search for the origin of a mysterious capsule found buried in a London building site.

Quatermass and the Pit is a British television science-fiction serial transmitted live by BBC Television in December 1958 and January 1959. It was the third and last of the BBC's Quatermass serials. 

This serial has been cited as having influenced Stephen King and the film director John Carpenter.

Quatermass warns that if implanted psychic powers survive in the human race, there could also still be an ingrained compulsion to enact the “Wild Hunt” of a race purge, but the media event goes ahead regardless. The power cables that string into the craft fully activate it for the first time, and glowing and humming like a living thing it starts to draw upon this energy source and awaken the ancient racial programming. Those Londoners in whom the alien admixture remains strong fall under the ship's influence; they merge into a group mind and begin a telekinetic mass murder of those without the alien genes, an ethnic cleansing of those the alien race mind considers to be impure and weak.

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Source: Quatermass And The Pit Part 5 of 6 The Wild Hunt – video dailymotion