Terminus is the fourth serial of the 20th season of the British science fiction television series Doctor Who, which was originally broadcast in four twice-weekly parts on BBC1 from 15 to 23 February 1983.
Mawdryn Undead is the third serial of the 20th season of the British science fiction television series Doctor Who. It was originally broadcast in four twice weekly parts on BBC1 from 1 to 9 February 1983.
Tegan Jovanka is a fictional character played by Janet Fielding in the long-running British science fiction television series Doctor Who. An Australian airline stewardess and a native of Brisbane who was a companion of the Fourth and Fifth Doctors, she was a regular in the programme from 1981 to 1984. Tegan appeared in 20 stories.
Nyssa is a fictional character in the long-running British science fiction television series Doctor Who. She is played by Sarah Sutton. Although Nyssa was created by writer Johnny Byrne for the single Fourth Doctor serial The Keeper of Traken, the production team subsequently decided she should be retained as a continuing character. Nyssa returned in the following serial, Logopolis, in which the Fourth Doctor regenerated, and remained as a companion of the Fifth Doctor. She was a regular in the programme from 1981 to 1983.
Adric is a fictional character played by Matthew Waterhouse in the long-running British science fiction television series Doctor Who. He was a young native of the planet Alzarius, which exists in the parallel universe of E-Space. A companion of the Fourth and Fifth Doctors, he was a regular in the programme from 1980 to 1982 and appeared in 11 stories. The name Adric is an anagram derived from the physicist Paul Dirac.
Logopolis is the seventh and final serial of the 18th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 28 February to 21 March 1981. It was Tom Baker's last story as the Fourth Doctor and marks the first appearance of Peter Davison as the Fifth Doctor and Janet Fielding as new companion Tegan Jovanka.
Castrovalva is the first serial of the 19th season of the British science fiction television series Doctor Who, which was first broadcast in four twice-weekly parts on BBC1 from 4 to 12 January 1982. It was the first full serial to feature Peter Davison as the Fifth Doctor. The title is a reference to the lithograph Castrovalva by M. C. Escher, which depicts the town Castrovalva in the Abruzzo region, Italy.
The Visitation is the fourth serial of the 19th season of the British science fiction television series Doctor Who. It was first broadcast in four twice-weekly parts on BBC1 from 15 to 23 February 1982.
Earthshock is the sixth serial of the 19th season of the British science fiction television series Doctor Who. It was first broadcast in four twice-weekly parts on BBC1 from 8 to 16 March 1982. This serial marks the final regular appearance of Matthew Waterhouse as Adric and his climactic death, with the final episode featuring unique silent credits in loving memory of the character. It is also the first to feature the Cybermen since Revenge of the Cybermen in 1975.
The Keeper of Traken is the sixth serial of the 18th season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts on BBC1 from 31 January to 21 February 1981.
Four to Doomsday is the second serial of the 19th season of the British science fiction television series Doctor Who, which was first broadcast in four twice-weekly parts on BBC1 from 18 to 26 January 1982.
Black Orchid is the fifth serial of the 19th season of the British science fiction television series Doctor Who, which was first broadcast on BBC1 on 1 and 2 March 1982.
The Fifth Doctor is an incarnation of the Doctor, the protagonist of the British science fiction television series Doctor Who. He is portrayed by Peter Davison.
The King's Demons is the sixth and final serial of the 20th season of the British science fiction television series Doctor Who, which was originally broadcast on BBC1 on 15 and 16 March 1983. This serial introduced Kamelion, voiced by Gerald Flood, as a companion.
Kinda is the third serial of the 19th season of the British science fiction television series Doctor Who, which was first broadcast in four twice-weekly parts on BBC1 from 1 to 9 February 1982.
Frontios is the third serial of the 21st season of the British science fiction television series Doctor Who, which was first broadcast in four twice-weekly parts on BBC1 from 26 January to 3 February 1984.
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 nineteenth season of British science fiction television series Doctor Who began on 4 January 1982 with Castrovalva, and ended with Time-Flight. John Nathan-Turner produced the series, with two script editors: Anthony Root and Eric Saward.
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.
