Doctor Who (season 13)
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.
Casting
Main cast
Tom Baker continued his role as The Fourth Doctor along with Sarah Jane Smith. Harry Sullivan, played by Ian Marter, departed in Terror of the Zygons and reappeared in The Android Invasion as a guest star.Recurring cast
Nicholas Courtney returned as Brigadier Lethbridge-Stewart in Terror of the Zygons having last appeared in Robot. John Levene makes his final appearance as Sergeant Benton in The Android Invasion after six years in the role.Serials
Terror of the Zygons was produced as part of the production schedule for Season 12, but was held for transmission from the end of that season to the beginning of Season 13, to coincide with a move from the new season starting at the beginning of the calendar year, to starting in late summer. Terror of the Zygons was also the last appearance of the Brigadier until Mawdryn Undead in Season 20. The season took a transmission break of two weeks over the Christmas 1975 period, between the broadcasts of The Android Invasion and The Brain of Morbius.Broadcast
The entire season was broadcast from 30 August 1975 to 6 March 1976.Home media
VHS releases
DVD and Blu-ray releases
In print
| Serial name | Novelisation title | Author | First published |
| Terror of the Zygons | Doctor Who and the Loch Ness Monster | Terrance Dicks | 15 January 1976 |
| Planet of Evil | Doctor Who and the Planet of Evil | Terrance Dicks | 21 July 1977 |
| Pyramids of Mars | Doctor Who and the Pyramids of Mars | Terrance Dicks | 16 December 1976 |
| The Android Invasion | Doctor Who and the Android Invasion | Terrance Dicks | 16 November 1978 |
| The Brain of Morbius | Doctor Who and the Brain of Morbius | Terrance Dicks | 19 May 1977 |
| The Seeds of Doom | Doctor Who and the Seeds of Doom | Philip Hinchcliffe | 17 February 1977 |