[on his inspiration for
Doctor Who (1963)] We required a new programme that would bridge the state of mind of sports fans, and the teenage pop music audience, while attracting and holding the children's audience accustomed to their Saturday afternoon serial. It had to be a children's programme and still attract both teenagers and adults. Also, as a children's programme, I was intent upon it containing basic factual information that could be described as educational, or, at least, mind opening for them. So my first thought was of a time-space machine with contemporary characters who would be able to travel forward and backward in time, and inward and outward in space. All the stories were to be based on scientific or historical facts as we knew them at the time.