Ian Chesterton is a fictional character in the British science fiction television series Doctor Who and a companion of the First Doctor. He was played in the series by William Russell and was one of the members of the programme's first regular cast, appearing in much of the first two seasons from 1963 to 1965. In a film adaptation of one of the serials, Dr. Who and the Daleks (1965), he was played by Roy Castle, but with a very different personality and backstory. Ian appeared in 16 stories and 77 episodes. He later returned for a cameo appearance, played once again by Russell, in the 2022 episode "The Power of the Doctor".
The War Machines is the tenth and final serial of the third season of the British science fiction television series Doctor Who, which was first broadcast in 4 weekly parts from 25 June to 16 July 1966.
Harry Sullivan is a fictional character from the British science-fiction television series Doctor Who and is a companion of the Fourth Doctor. Played by Ian Marter, the character appears as a regular during the programme's twelfth season in 1974–1975. Harry appeared in 7 stories.
Sarah Jane Smith is a fictional character played by Elisabeth Sladen in the long-running BBC Television science fiction series Doctor Who and two of its spin-offs. Sarah Jane is a dogged investigative journalist who first encounters alien time traveller the Doctor while trying to break a story on a top secret research facility, and subsequently becomes his travelling companion on a series of adventures spanning the breadth of space and time. After travelling with The Doctor in four seasons of the show they suddenly part ways, and after this she continues to investigate strange goings-on back on Earth. Over time, Sarah Jane establishes herself as a committed defender of Earth from alien invasions and other threats, occasionally reuniting with The Doctor in the course of her own adventures, all the while continuing to work as a freelance investigative journalist.
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.
Josephine "Jo" Grant, later Jo Jones, is a fictional character played by Katy Manning in the long-running British science fiction television series Doctor Who. Jo was introduced by Barry Letts and Terrance Dicks in the first episode of Doctor Who's eighth season (1971) as a new companion of series protagonist the Doctor, in his third incarnation. After the Doctor's previous companion Liz Shaw, a scientist and intellectual, the production team looked to introduce a less experienced companion to act as an audience surrogate. Jo appeared in 15 stories.
Steven Taylor is a fictional character played by Peter Purves in the long-running British science fiction television series Doctor Who. A space pilot from Earth in the future, he was a companion of the First Doctor and a regular in the programme from 1965 to 1966. Steven appeared in 10 stories.
Benjamin "Ben" Jackson and Polly, sometimes called Polly Wright in spin-off material, are fictional characters played by Michael Craze and Anneke Wills, in the long-running British science fiction television series Doctor Who.
The Ark is the sixth serial of the third season of the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 5 to 26 March 1966.
Jackie Lane was an English actress known for her role as Dodo Chaplet, a companion of the Doctor, in the BBC science fiction television series Doctor Who. She played the part from February to July 1966 alongside William Hartnell as the Doctor.
The Massacre is the completely missing fifth serial of the third season in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 5 to 26 February 1966.
The Celestial Toymaker is the mostly missing seventh serial of the third season in the British science fiction television programme Doctor Who, which was first broadcast in four weekly parts from 2 to 23 April 1966.
The Gunfighters is the eighth serial of the third season in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 30 April to 21 May 1966.
The Savages is the completely missing ninth serial of the third season in the British science fiction television series Doctor Who, which was first broadcast in four weekly parts from 28 May to 18 June 1966.
The First Doctor is the original incarnation of the Doctor, the protagonist of the British science fiction television series Doctor Who. He was portrayed by actor William Hartnell in the first three series from 1963 to 1966 and the tenth anniversary story The Three Doctors from 1972 to 1973. The character would occasionally appear in the series after Hartnell's death, most prominently as portrayed by Richard Hurndall in the 1983 multi-doctor special The Five Doctors, and as portrayed by David Bradley in the 2017 Twelfth Doctor episodes "The Doctor Falls" and "Twice Upon a Time" and in the 2022 Thirteenth Doctor episode "The Power of the Doctor", the latter previously having portrayed Hartnell himself in the 2013 biopic An Adventure in Space and Time.
In the long-running BBC television science fiction programme Doctor Who and related works, the term "companion" refers to a character who travels or shares adventures with the Doctor. In most Doctor Who stories, the primary companion acts as an audience surrogate. They provide the lens through which the viewer is introduced to the series. The companion character often furthers the story by asking questions and getting into trouble; also by helping, rescuing, or challenging the Doctor. This designation is applied to a character by the show's producers and appears in the BBC's promotional material and off-screen fictional terminology. The Doctor also refers to the show's other leads as their "friends" or "assistants"; the British press have also used the latter term.
Vicki is a fictional character played by Maureen O'Brien in the long-running British science fiction television series Doctor Who. An orphan from the 25th century, she was a companion of the First Doctor and a regular in the programme in Seasons 2 and 3 in 1965. Her last name was never revealed during the series. Vicki appeared in 9 stories.
Death of the Doctor is a two-part story of The Sarah Jane Adventures which was broadcast on CBBC on 25 and 26 October 2010. It is the third story of the fourth series. A cross-over story with Doctor Who, story features actress Katy Manning reprising her role as Jo Grant for the first time since the 1973 Doctor Who serial The Green Death and a guest appearance by Matt Smith—Doctor Who's lead actor from 2010 to 2013—as the Eleventh Doctor. In the episode, Tia Karim, a rogue member of UNIT allies with members of the Shansheeth alien race to lure Sarah Jane and Jo into a trap so they can access the Doctor's time machine the TARDIS and change history and Karim can leave Earth, with the cover story of the Doctor's funeral. Exposition at the end of the episode provides updates on the lives of numerous companions from the "classic era" who had gone unaddressed in the revived era. This story was the last to feature Sarah Jane and the Doctor together on-screen.
The third season of British science fiction television series Doctor Who began on 11 September 1965 with the story Galaxy 4 and ended on 16 July 1966 with The War Machines. Only 17 out of 45 episodes survive in the BBC archives; 28 remain missing. As a result, only three serials are complete.
