on which network was it aired?
BBC Television
The Quatermass Experiment
The Quatermass Experiment is a British science fiction serial broadcast by BBC Television 
what is "the quatermass experiment"? A British science fiction serial when was it aired? Summer of 1953 name a few characters from it? Professor Bernard Quatermass, Victor Carroon, Paterson and Briscoe
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The Quatermass Experiment [SEP] Introduction
The Quatermass Experiment is a British science fiction serial broadcast by BBC Television during the summer of 1953 and re-staged by BBC Four in 2005. Set in the near future against the background of a British space programme, it tells the story of the first manned flight into space, supervised by Professor Bernard Quatermass of the British Experimental Rocket Group. When the spaceship that carries the first successful crew returns to Earth, two of the three astronauts are missing, and the third – Victor Carroon – is behaving strangely. It becomes apparent that an alien presence entered the rocket during its flight, and Quatermass and his associates must prevent the alien from destroying the world.