It was during this season that the Doctor cut ties to UNIT (after Terror of the Zygons, the Brigadier would not appear again until Mawdryn Undead in 1983, and The Seeds of Doom marked the last occasion to date that the Doctor was explicitly said to be working for UNIT - as opposed to working with them as occasions warranted). Several of the serials in this season, particularly Pyramids of Mars and The Brain of Morbius, are among the best-known of the 1970s-era storylines. Though it was aired as a part of Season 13, Terror of the Zygons was actually filmed as part of the previous season; this holdover allowed the series to switch back to an autumn season start.
Episodes
E1
1. Terror of the Zygons (1)
7.5
August 30, 1975
25 min
Scotland, the near future. Something is smashing oil rigs off the Scottish coast, and UNIT have been called in to investigate. The Brigadier summons the Doctor to Earth to help in the investigation, but it soon becomes clear some kind of alien presence is at work...
Nicholas Courtney, Ian Marter, John Levene, John Woodnutt, Lillias Walker
E2
2. Terror of the Zygons (2)
8.0
September 6, 1975
25 min
The Zygon traps the Doctor and Sarah Jane in a decompression chamber while Harry is taken to the aliens' underwater ship.
Guest Stars:
Nicholas Courtney, Ian Marter, John Levene, John Woodnutt, Lillias Walker
E3
3. Terror of the Zygons (3)
7.8
September 13, 1975
25 min
The Doctor and the Brigadier begin to realise who the Zygon imposters among them are while Sarah Jane discovers a secret tunnel to the underwater ship.
Guest Stars:
Nicholas Courtney, Ian Marter, John Levene, John Woodnutt, Lillias Walker
E4
4. Terror of the Zygons (4)
7.7
September 20, 1975
25 min
UNIT attempt to track down the Zygon ship while Broton prepares to have the Skarasen attack London.
Guest Stars:
Nicholas Courtney, Ian Marter, John Levene, John Woodnutt, Lillias Walker
E5
5. Planet of Evil (1)
7.4
September 27, 1975
25 min
The Doctor and Sarah answer a distress call and find themselves on Zeta Minor, the last planet of the known universe, where a Morestran expedition has gone missing.
Guest Stars:
Ewen Solon, Prentis Hancock, Frederick Jaeger, Graham Weston, Louis Mahoney
E6
6. Planet of Evil (2)
7.5
October 4, 1975
25 min
The Doctor realises that Zeta Minor lies on the boundary between the universes of matter and anti-matter and something on the planet won't let the Morestrans leave.
Guest Stars:
Ewen Solon, Prentis Hancock, Frederick Jaeger, Graham Weston, Louis Mahoney
E7
7. Planet of Evil (3)
7.5
October 11, 1975
25 min
The Doctor makes a deal with the Anti-Matter Beast to return all the anti-matter to the planet but Sorenson is determined to continue his research.
Guest Stars:
Ewen Solon, Prentis Hancock, Frederick Jaeger, Graham Weston, Michael Wisher
E8
8. Planet of Evil (4)
7.2
October 18, 1975
25 min
The Doctor tries to convince Sorenson to sacrifice himself for the rest of the crew but Salamar's attempt to deal with the situation causes their problems to multiply.
Guest Stars:
Ewen Solon, Prentis Hancock, Frederick Jaeger, Melvyn Bedford, Michael Wisher
E9
9. Pyramids of Mars (1)
8.4
October 25, 1975
25 min
The Doctor and Sarah are drawn off course and, instead of UNIT HQ, they arrive on the same site in 1911.
Guest Stars:
Michael Bilton, Bernard Archard, Peter Copley, Michael Sheard, Peter Mayock
E10
10. Pyramids of Mars (2)
8.0
November 1, 1975
25 min
The Doctor, Sarah and Laurence try to find a way to sever Sutekh's link to the mummies while poacher Ernie Clements finds the priory surrounded by a forcefield.
Guest Stars:
Bernard Archard, Peter Copley, Michael Sheard, Peter Mayock, Nick Burnell
E11
11. Pyramids of Mars (3)
8.3
November 8, 1975
25 min
The Doctor and Sarah try to destroy Sutekh's rocket but the Osiran's mental powers prove too great for them.
Guest Stars:
Bernard Archard, Gabriel Woolf, Michael Sheard, Nick Burnell, Melvyn Bedford
E12
12. Pyramids of Mars (4)
8.0
November 15, 1975
25 min
Sutekh forces the Doctor to transport Scarman and a mummy to Mars, where the Doctor and Sarah try to stop them destroying the Eye of Horus.
Guest Stars:
Bernard Archard, Gabriel Woolf, Nick Burnell, Melvyn Bedford, Kevin Selway
E13
13. The Android Invasion (1)
6.3
November 22, 1975
25 min
The Doctor and Sarah return to Earth in the present day to find a strangely deserted village and woods stalked by white-clad figures.
Guest Stars:
Peter Welch, Milton Johns, Max Faulkner, Martin Friend
E14
14. The Android Invasion (2)
7.0
November 29, 1975
25 min
The Doctor suspects Crayford brought something to Earth in his rocket, as he and Sarah find themselves hunted by UNIT.
Guest Stars:
Ian Marter, John Levene, Peter Welch, Milton Johns, Max Faulkner
E15
15. The Android Invasion (3)
6.5
December 6, 1975
25 min
The Doctor is captured by Styggron and left to die in the destruction of the fake village but Sarah escapes from the disorientation chamber to try and rescue him.
Guest Stars:
Ian Marter, John Levene, Peter Welch, Milton Johns, Max Faulkner
E16
16. The Android Invasion (4)
6.6
December 13, 1975
25 min
The Doctor and Sarah reach Earth and try to warn the research centre about the Kraal invasion before Styggron unleashes his virus.
Guest Stars:
Ian Marter, John Levene, Milton Johns, Max Faulkner, Martin Friend
E17
17. The Brain of Morbius (1)
8.2
January 3, 1976
25 min
The storm-lashed planet Karn. Near a graveyard of crashed starships, the demented surgeon Solon hides in his castle, the last acolyte of the Time Lord despot Morbius. He only needs one final item to make his master live again... and then the Doctor and Sarah arrive...
Guest Stars:
Philip Madoc, Cynthia Grenville, Gillian Brown, Sue Bishop, Janie Kells
E18
18. The Brain of Morbius (2)
8.0
January 10, 1976
25 min
The Doctor is captured by the Sisterhood, and Sarah Jane is blinded freeing him. The Doctor has no choice but to go back for a cure, unaware that he is leaving Sarah Jane in the hands of a treacherous Dr. Solon and the renegade Time Lord Morbius.
Guest Stars:
Philip Madoc, Michael Spice, Cynthia Grenville, Gillian Brown, Sue Bishop
E19
19. The Brain of Morbius (3)
8.3
January 17, 1976
25 min
While the Doctor goes to confront the Sisterhood to seek a cure for Sarah Jane's blindness, Solon realizes that he must transfer Morbius' brain into a new body before it is too late.
Guest Stars:
Philip Madoc, Michael Spice, Cynthia Grenville, Gillian Brown, Sue Bishop
E20
20. The Brain of Morbius (4)
8.3
January 24, 1976
25 min
Morbius lives once more, but as a rampaging beast. The Doctor is forced to ally with Dr. Solon to bring him to heel, but the two disagree about what should happen to Morbius.
Guest Stars:
Philip Madoc, Michael Spice, Cynthia Grenville, Gillian Brown, Sue Bishop
E21
21. The Seeds of Doom (1)
8.1
January 31, 1976
25 min
The Antarctic, the near future. A strange seed-pod is unearthed from 20-thousand-year-old ice. The Doctor and Sarah go to investigate, but are too late to prevent the pod infecting a scientist and unleashing a threat to all animal life on Earth...
Guest Stars:
Tony Beckley, John Challis, Hubert Rees, John Gleeson, Michael McStay
E22
22. The Seeds of Doom (2)
8.3
February 7, 1976
25 min
Two employees of the millionaire Harrison Chase arrive at the Antarctic base, and they will stop at nothing to get hold of the second seed-pod.
Guest Stars:
Tony Beckley, John Challis, Hubert Rees, John Gleeson, Michael McStay
E23
23. The Seeds of Doom (3)
7.7
February 14, 1976
25 min
The Doctor and Sarah Jane return to England after their Antarctic ordeal and Chase tries to eliminate them, but they escape and track him down at his estate, where he is preparing to open the Krynoid pod.
Guest Stars:
Tony Beckley, John Challis, Kenneth Gilbert, Michael Barrington, Seymour Green
E24
24. The Seeds of Doom (4)
8.0
February 21, 1976
25 min
The Doctor is captured by Chase, who plans to breed the stolen Krynoid pod. He is placed in an automated compost hopper and only Sarah Jane can save him... but will she make it before the Krynoid grows to fruition ?
Guest Stars:
Tony Beckley, John Challis, Kenneth Gilbert, Michael Barrington, Seymour Green
E25
25. The Seeds of Doom (5)
7.9
February 28, 1976
25 min
The Krynoid grows to a monstrous size and traps the Doctor and the others in a cottage. The creature demands they turn over the Doctor, while Chase seeks to make an alliance with the alien vegetation.
Guest Stars:
Tony Beckley, John Challis, Michael Barrington, Seymour Green, Sylvia Coleridge
E26
26. The Seeds of Doom (6)
8.0
March 6, 1976
25 min
The Doctor, Sarah Jane, and Scorby are trapped in the manor as a possessed Chase stalks them from within, while the gigantic Krynoid prepares to crush them from without. Worse, the alien plant is ready to germinate, spreading its seeds across England.
Guest Stars:
Tony Beckley, John Challis, Michael Barrington, John Acheson, Ray Barron
