State of Decay is the fourth serial of the 18th season in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 22 November to 13 December 1980.
Horror of Fang Rock is the first serial of the 15th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 3 to 24 September 1977.
The Invasion of Time is the sixth and final serial of the 15th season of the British science fiction television series Doctor Who, which was first broadcast in six weekly parts on BBC1 from 4 February to 11 March 1978. It features the final appearance of Louise Jameson as the companion Leela.
K9, occasionally written K-9, is the name of several fictional robotic canines in the long-running British science fiction television series Doctor Who, first appearing in 1977. K9 has also been a central character in three of the series' television spin-offs: the one-off K-9 and Company (1981), The Sarah Jane Adventures (2007–2011) and K9 (2009–2010). Although not originally intended to be a recurring character in the series, K9 was kept in the show following his first appearance because he was expected to be popular with younger audiences. There have been at least four separate K9 units in the series, with the first two being companions of the Fourth Doctor. Voice actor John Leeson has provided the character's voice in most of his appearances, except during season 17 of Doctor Who, in which David Brierley temporarily did so. The character was created by Bob Baker and Dave Martin, to whom rights to the character still belong; consequently, Baker's spin-off series K9, which is not BBC-produced, could not directly reference events or characters from Doctor Who, though it attempted to be a part of that continuity.
Leela is a fictional character played by Louise Jameson in the long-running British science fiction television series Doctor Who. She was a companion of the Fourth Doctor and a regular in the programme from 1977 to 1978. Leela appeared in nine stories.
The sixteenth season of British science fiction television series Doctor Who, known collectively as The Key to Time, began on 2 September 1978 with The Ribos Operation, and ended with The Armageddon Factor. The arc was originally conceived by producer Graham Williams, who had proposed it as part of his application for the producer's job in 1976. The name refers to the powerful artefact, the segments of which are what the Fourth Doctor and his companions, Romana and K9, search for during the season. Anthony Read continued in his role as script editor, from the previous season. Douglas Adams also became script editor alongside Read.
Image of the Fendahl is the third serial of the 15th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 29 October to 19 November 1977.
The Sun Makers is the fourth serial of the 15th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 26 November to 17 December 1977.
The Fourth Doctor is an incarnation of the Doctor, the protagonist of the British science fiction television series Doctor Who. He is portrayed by Tom Baker.
The twenty-fifth season of British science fiction television series Doctor Who began on 5 October 1988. It comprised four separate serials, beginning with Remembrance of the Daleks and ending with The Greatest Show in the Galaxy. To mark the 25th anniversary season, producer John Nathan-Turner brought back the Daleks and the Cybermen. The American New Jersey Network also made a special behind-the-scenes documentary called The Making of Doctor Who, which followed the production of the 25th anniversary story Silver Nemesis. Andrew Cartmel script edited the series.
The twenty-first season of British science fiction television series Doctor Who began on 5 January 1984 with the Fifth Doctor serial Warriors of the Deep, and ended with Colin Baker's first serial The Twin Dilemma. For the third time, the entire TARDIS crew changed over the course of a single season. John Nathan-Turner produced the series, with Eric Saward script editing.
The twentieth season of British science fiction television series Doctor Who began on 3 January 1983 with the story Arc of Infinity, and ended 16 March 1983 with The King's Demons. A 20th Anniversary special, The Five Doctors, followed in November 1983. John Nathan-Turner produced this series, with Eric Saward script editing.
The eighteenth season of British science fiction television series Doctor Who consisted of seven four-episode serials broadcast from 30 August 1980 with the serial The Leisure Hive, to 21 March 1981 with the serial Logopolis. The season is Tom Baker's final as the Fourth Doctor before his regeneration into the Fifth Doctor, as well as Lalla Ward's as companion Romana II and John Leeson's as the voice of K9. For the second time, the entire main cast changed over the course of a single season. The season also sees the debut of Matthew Waterhouse as Adric, Sarah Sutton as Nyssa, and Janet Fielding as Tegan Jovanka, the three of whom would remain regular companions into the Fifth Doctor's era, as well as the return of the Master, portrayed both by Geoffrey Beevers and Anthony Ainley.
The seventeenth season of British science fiction television series Doctor Who began on 1 September 1979 with the story Destiny of the Daleks, and ended with The Horns of Nimon. This was Graham Williams' final series producing Doctor Who. The script editor was Douglas Adams.
The fourteenth season of British science fiction television series Doctor Who began on 4 September 1976 with The Masque of Mandragora, and ended with The Talons of Weng-Chiang. The third Fourth Doctor series, it was the final series of Philip Hinchcliffe's production, whilst Robert Holmes stayed till The Sun Makers in the next series.
The thirteenth season of British science fiction television series Doctor Who began on 30 August 1975 with the story Terror of the Zygons, and ended with The Seeds of Doom. This is the second series to feature the Fourth Doctor, played by Tom Baker, with Philip Hinchcliffe producing and Robert Holmes script editing. In September 2009, it was ranked as readers' favourite season in Doctor Who Magazine issue 413.
The twelfth season of British science fiction television series Doctor Who began on 28 December 1974 with Tom Baker's first serial Robot, and ended with Revenge of the Cybermen on 10 May 1975.
The eleventh season of British science fiction television series Doctor Who began on 15 December 1973 with the serial The Time Warrior, and ended with Jon Pertwee's final serial Planet of the Spiders. The season's writing was recognized by the Writer's Guild of Great Britain for Best Children's Drama Script. This is the Third Doctor's fifth and final series, and also the last consecutively to be produced by Barry Letts and script edited by Terrance Dicks. Both Letts and Dicks would work for the programme again, however - Letts in Season 18 and Dicks on future stories, e.g. Horror of Fang Rock.
In 2012, Big Finish Productions began producing audio dramas featuring Doctor Who's fourth Doctor, as portrayed by Tom Baker. Baker had previously declined to feature in any Big Finish releases, but after recording a trilogy of full cast audio boxsets for BBC Audiobooks, he decided to participate. This was also part of a spin off series of the Monthly range.
