Doctor Who is not just another television programme. It is a familiar and much-loved British institution that after more than twenty years continues to enjoy enormous success both at home and abroad. The Key to Time marks the programme's coming of age — twenty-one years old on 23 November 1984. Peter Haining has adopted the novel technique of exploring the history of the series through key dates in its many life-cycles. He demonstrates — with extensive reference to files kept in the Doctor Who Production Office — how much a part of British life the programme has become, and how the impact of this extraordinary phenomenon has travelled further afield. He traces the many changes the series has undergone since the first episode was broadcast in November 1963 — not only in terms of regenerated