S8E20
Gritty yet hopeful
Written by Malcolm Hulke
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Colony In Space Part 6

The Doctor and Jo Grant must thwart the Master's scheme to exploit a super-weapon hidden on a primitive colony planet, a weapon capable of destroying stars and holding the galaxy to ransom, while also helping the colonists survive.

The Doctor and Jo arrive on a desolate colony planet, Uxarieus, to investigate a mystery linked to a missing Time Lord artifact, only to discover the Master is already there, manipulating events for his own nefarious purposes. The Master seeks to exploit a Doomsday Weapon created by a long-lost civilization, a weapon capable of causing stars to explode, in order to hold the galaxy to ransom.

They find themselves caught between warring factions--the Interplanetary Mining Corporation (IMC), who seek to exploit the planet's mineral resources, and the primitive colonists struggling to survive on the barren landscape. The colonists are being forced off-world by Captain Dent of the IMC, who is acting underhandedly. Jo is briefly captured and slated for deportation with the colonists, but is rescued by Caldwell, an engineer who begins to question Dent's motives.

The Doctor and the Master venture into the ancient Primitive city, where they uncover the history of a super-race and the Doomsday Weapon. The Master reveals his plan to use the weapon's threat to control the galaxy. The Doctor is appalled and refuses to join him, leading to conflict. The colonists, led by Ashe and Winton, resist the IMC's oppression. Ashe sacrifices himself by piloting the colonist's rocket, rigged to explode, in order to clear the way for the other colonists. Meanwhile, the Doctor and the Master confront the Guardian of the Doomsday Weapon, a telepathic alien. The Doctor convinces the Guardian of the Master's evil intentions, leading the Guardian to initiate the weapon's self-destruction.

As the Primitive city self-destructs, the Doctor, Jo, and Caldwell escape, but find themselves surrounded by Morgan and the remaining IMC guards. Just then, Winton leads a group of armed colonists, and a firefight ensues. The Master uses the chaos to sneak away. The Doctor and Jo pursue the Master, who escapes in his TARDIS. With the Master gone and the weapon destroyed, the immediate threat is neutralized. The colonists receive word that a genuine Adjudicator is on the way from Earth to investigate the IMC's actions. Caldwell, disillusioned with the IMC, decides to stay and help the colonists rebuild their lives. The Doctor and Jo return to Earth moments after they had left, much to the bewilderment of the Brigadier at UNIT. In the end, the Doctor thwarts the Master's plans and allows the colonist to forge ahead with their new lives.


Events in This Episode

The narrative beats that drive the story

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Act 1

The episode opens with the Doctor and the Master captured by the primitive inhabitants of Uxarieus and led into their ancient city. Simultaneously, Jo Grant and Caldwell, having escaped the Master's TARDIS, learn the Doctor's location and the Master's true identity as a super-criminal. On the IMC side, Captain Dent continues his ruthless campaign to force the colonists off-world. He dismisses Jo's warnings and orders her onto the colonist ship, which is slated for deportation. Caldwell, though initially compliant, is urged by Jo to intervene and find the Doctor and Master. Inside the Primitive City, the Master reveals his deep knowledge of the planet's history, gleaned from stolen Time Lord files, specifically focusing on a super-race that developed a devastating Doomsday Weapon. He openly states his intention to use this weapon to hold the galaxy to ransom. After using a gas grenade to escape the Primitives, the Doctor and Master continue deeper into the city. Meanwhile, Ashe, the colonist's pilot, is pressured by Dent to launch their ship despite his concerns. The act culminates in a devastating explosion: the colonist ship, carrying all the remaining colonists and Ashe, lifts off and detonates, witnessed by a horrified Jo and Caldwell. This event irrevocably confirms Dent's villainy and escalates the stakes, compelling Jo and Caldwell to take more direct action.

Act 2

Following the catastrophic destruction of the colonist ship, Jo and Caldwell resolve to find the Doctor and the Master within the Primitive City. Inside the city's core, the Master reveals the full destructive potential of the Doomsday Weapon, demonstrating its capability to make stars explode, including Earth's sun. The Doctor reacts with horror, refusing the Master's offer of a shared galactic empire, firmly asserting that "absolute power is evil." As they argue, the Guardian, the last remnant of the super-race, emerges. The Master attempts to manipulate the telepathic Guardian, presenting himself as a savior who will restore the city's glory and use the weapon for peace. The Doctor swiftly counters, exposing the weapon's true legacy of decay and poisoned soil on Uxarieus, and the Master's true intent to spread death and destruction across the galaxy. The Guardian, sensing the Master's malevolence, disarms him and instructs the Doctor to activate the weapon's self-destruct mechanism. The Doctor complies, initiating the destruction of the Doomsday Weapon and the entire Primitive City. The ground begins to shake violently as the city crumbles, forcing the Doctor and the Master to flee. This act marks the climax of the Doctor's direct confrontation with the Master over the weapon, with the Doctor successfully preventing its use and ensuring its permanent destruction.

Act 3

As the Primitive City violently self-destructs, the Doctor, Master, Jo, and Caldwell make a desperate escape. They emerge from a cliff face only to be confronted by Morgan and the remaining IMC guards. The Master attempts to assert authority, claiming to be the Adjudicator, but Morgan dismisses him as an imposter. A tense standoff escalates into a full-blown firefight when Winton and a group of armed colonists appear on a ridge, demanding the IMC guards surrender. Amidst the chaos of the battle, the Master seizes an opportunity, commandeering a buggy and making his escape. The Doctor and Jo pursue him in another buggy, but the Master reaches his TARDIS and dematerializes, successfully fleeing the planet. With the immediate threat of the Doomsday Weapon and the Master neutralized, the focus shifts to the colonists' future. Winton explains Ashe's heroic sacrifice, revealing he intentionally piloted the exploding ship to clear the way for the other colonists. A genuine Adjudicator from Earth is confirmed to be en route, promising justice for the IMC's actions. Caldwell, disillusioned by the IMC's cruelty, chooses to abandon his former employers and commit to helping the colonists rebuild their lives on Uxarieus. The Doctor and Jo locate their TARDIS, which the Primitives had stolen, and return to Earth, materializing mere seconds after their departure, much to the Brigadier's utter bewilderment.