The season featured a story arc involving E-Space and the return of the Master who had stolen a new body rather than regenerate. The stories were darker and more adult in tone than those during the Graham Williams era. They also attempted to emphasise science, much to the satisfaction of both script editor Christopher H. Bidmead and executive producer Barry Letts. Notably, this season revolves around the theme of entropy, linking together all of its stories in a rare phenomenon for the show (while other story arcs would be linked together via people, objects, etc, the use of an overarching theme for a season was unprecedented). This theme would eventually foreshadow and culminate in the Doctor’s regeneration at the end of the season.
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Episode 1
The Leisure Hive (1)
The planet Argolis, around the year 2290. The Argolins live in a huge shielded city, protected from the irradiated wasteland outside. The planet's survival depends on the tourists their Leisure…
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Episode 2
The Leisure Hive (2)
Another man is found dead, strangled by the Doctor's scarf, so the Doctor is put on trial. By some of the archaic rules of law, he's made to "prove" his…
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Episode 3
The Leisure Hive (3)
With the Doctor suffering from the time experiment, the clandestine schemes of others start coming to light, along with the secreted purposes to which the tachyonic generator has been used.
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Episode 4
The Leisure Hive (4)
With the saboteur and murderer revealed and arrested, peace should now be restored, but a new threat emerges - a war-monger who's both ready and eager to aggress upon other…
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Episode 5
Meglos (1)
The desert planet Zolpha-Thura, the 1980s. Giant intelligent megalomaniac cactus Meglos is planning to conquer the galaxy but first it needs the dodecahedron, a powerful energy source currently on the…
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Episode 6
Meglos (2)
With the TARDIS occupants trapped in a chronic histeratic loop (forever reliving the same moment in time), the devious Meglos - disguised as the Doctor - gains the trust of…
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Episode 7
Meglos (3)
Can Romana escape the Gaztaks? What has become of the Dodecahedron? What pressing appointment awaits the Doctor?
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Episode 8
Meglos (4)
With the Doctor about to be ritualistically sacrificed to appease the god Ti for stealing the dodecahedron, Meglos and the pirates return to Zolfa-Thura with the dodecahedron to fire up…
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Episode 9
Full Circle (1)
Deep space, an unknown time - on course for Gallifrey, the TARDIS passes through a strange disruption. When they materialise, the scanner shows the Time Lord homeworld... but the travellers…
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Episode 10
Full Circle (2)
As the humanoid community takes refuge in their crashed spaceship, venomous marsh spiders begin to hatch from the local fruit while bestial marshmen emerge from the waters to walk the…
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Episode 11
Full Circle (3)
Infection from a spider bite causes Romana's personality to change. Meanwhile the Doctor, after discovering that the spaceship society is in a perpetual state of repair and upgrade, has morality…
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Episode 12
Full Circle (4)
Marshmen invade the Terradonian ship thanks to Romana, who seems to be in communion with them. While the ship's inhabitants flee for their lives, the Doctor discovers a crucial fact…
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Episode 13
State of Decay (1)
Still trapped in negative E-Space, the TARDIS lands on an unnamed world to find a society sliding back into feudalism. What is the secret of the Three Who Rule? And…
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Episode 14
State of Decay (2)
The Doctor and Romana are escorted to the tower to meet the royal leaders, hoping they can find answers to why this society evolves backwards. The Doctor recognizes the tower…
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Episode 15
State of Decay (3)
The Doctor finds archive material in the TARDIS that tells him he's dealing with an ancient enemy of the Time Lords, a nearly indestructible king vampire who's ready to revive…
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Episode 16
State of Decay (4)
The Doctor joins the villagers' revolt against their vampire rulers, unsure how to kill the king vampire. Meanwhile Adric is first in line to join the new vampire order while…
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Episode 17
Warriors’ Gate (1)
The TARDIS is drawn into an empty white void, somewhere between universes. But they are not the only ones trapped there.
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Episode 18
Warriors’ Gate (2)
When Rorvik learns that Romana is a time sensitive, he takes her prisoner, forcing her to find a way out of the void. The Doctor attempts to discover what lies…
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Episode 19
Warriors’ Gate (3)
While Biroc leads the Doctor to a view of the Tharil's lordly past, Romana learns more about the damaged freighter and the cold-heartedness of its crew. Meanwhile Commander Rorvik, confounded…
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Episode 20
Warriors’ Gate (4)
The Doctor deduces that the freighter is a slave ship loaded up with Tharils to be sold as time machine components, but the immense weight of Rorvik's damaged ship, designed…
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Episode 21
The Keeper of Traken (1)
The planet Traken. The Traken union is a society living in perfect harmony, watched over by the powerful but benign Keeper. But now the Keeper is dying, and he senses…
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Episode 22
The Keeper of Traken (2)
Tremas claims consular privilege to protect the Doctor and Adric from execution, though it binds his fate to theirs if they're found guilty of murder. Melkur strengthens his hold over…
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Episode 23
The Keeper of Traken (3)
With Tremas falling under suspicion, due to his association with the Doctor, a new Keeper Nominate is named. Now, with everything in place, Melkur has only a short wait before…
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Episode 24
The Keeper of Traken (4)
With the merciless Melkur in control of The Source, the Doctor and his allies have only a slim chance of deposing him, which also puts the peace of the Traken…
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Episode 25
Logopolis (1)
Deciding to repair the TARDIS' chameleon circuit, the Doctor goes to Earth to find a real police box. But an old enemy is one step ahead of him.
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Episode 26
Logopolis (2)
The Doctor, aware that his time may soon be ending, travels to the Logopolis where a series of fateful events are set in motion.
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Episode 27
Logopolis (3)
With Nyssa from Traken unexpectedly rejoining the group, Adric aids the Monitor of Logopolis in trying to save the Doctor before time runs out. The Master, at liberty to prepare,…
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Episode 28
Logopolis (4)
With the universe collapsing, the Doctor forms an uneasy alliance with the Master to save it. In case all does not go well, the Watcher takes the Doctor's companions to…