A science-fiction thriller in seven episodes by Fred Hoyle and John Elliot.
Starring Esmond Knight with Peter Halliday, Patricia Kneale, Noel Johnson and introducing Julie Christie

The radio message from outer space received on the new giant radio-telescope throws the country into a panic. Scientists, military, security forces, and a great international cartel are all competing for the information it contains. The only one with the answer is the young scientist John Fleming. "It's a do-it-yourself kit. And it isn't human!"
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