Filming locations included The Exchange, Mount Stuart Square, Cardiff, South Glamorgan, Wales, United Kingdom.
The film was the main feature on the front cover of the Radio Times when it was first shown.
Dirk Bogarde plays a has-been UK TV personality hired to front the organisation but grows uneasy about its aims.
At the end of the film, he attempts to warn the television audience about the dangers they face during the station's first transmission.
He only realises when he is escorted from the studio by a stony-faced security guard and sees on the television monitors the (innocuous) beginning of his broadcast followed by a swift cut to his interviewer who thanks him for his contribution and then announces the showing of their first film, Back to the Future.