success for the BBC. Nation contributed further scripts to Doctor Who. In 1965, he and Dennis Spooner co-wrote the 12-part serial The Daleks' Master Plan, after which Nation, who still held the copyright to the Daleks, attempted to launch a Dalek spin-off TV series in the United States. Various other Dalek tie-in material appeared, including comic strips in the children's weekly TV Century 21 and annuals; such material was frequently credited to Nation, even when written by others. Over the next few years, appearances by the Daleks in Doctor Who became less frequent and were written by other authors (Whitaker wrote The Power of the Daleks (1966) and The Evil of the Daleks (1967), and Louis Marks wrote Day of the Daleks (1972)). In 1973, following an eight-year absence from the series, Nation returned to writing for the Daleks on Doctor Who with the Third Doctor serial Planet of the Daleks. In 1998, readers of Doctor Who Magazine voted Nation's 1975 serial Genesis of the Daleks the greatest Doctor Who story of all time. In the story, Nation introduced the character of Davros, the creator of the Daleks, who went on to appear in further storylines. Nation also wrote two non-Dalek scripts for Doctor Who, The Keys of Marinus in 1964, which introduced the Voord, and The Android Invasion in 1975, which introduced the Kraals. Nation's final script for Doctor Who was Destiny of the Daleks, broadcast in 1979. His work on Doctor Who was the subject of the documentary Terror Nation, a special feature on the BBC DVD release of Destiny of the Daleks. Out of the Unknown Nation's first work on the science-fiction anthology series Out of the Unknown was scripting an adaptation of Ray Bradbury's short story The Fox and the Forest in 1965 for the show's debut series. It was about a 21st-century couple taking a forbidden trip to Mexico in 1938, only to be followed by enforcers from the future. It is one of only two episodes from the first series to be considered lost, with only two photographs and the end titles known to exist. In 1969, when the show began to be produced in colour, Nation granted permission for the Daleks to be used in the series three episode Get Off My Cloud, based on the story by Peter Phillips about a bed-bound science-fiction author who finds himself within one of his own