Story Structure — 4 Plot Phases
Occupation and Assassination
The Earth Empire plans to decolonise Solos, prompting the Marshal and Varan to assassinate the Administrator. The Third Doctor and Jo arrive on Skybase, only for Ky to abduct Jo to the planet's surface.
Key Events
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Earth Decolonisation Plan — Earth plans to decolonise Solos, threatening Marshal's control.
Location: Earth Empire Command
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Administrator Assassination — Marshal and Varan assassinate the Administrator to stop independence.
Location: Skybase One
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Doctor and Jo Arrival — Time Lords transport Doctor and Jo to Skybase via a special pod.
Location: Skybase One
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Ky Abducts Jo — Ky teleports to the surface, taking Jo with him to survive.
Location: Solos Surface
Caverns and Conspiracies
The Doctor uncovers the Marshal's terraforming plot and forms a truce with Varan after the Marshal kills Varan's son. Sondergaard rescues the group from cave fumigation, leading to the discovery of ancient tablets and a crystal.
Key Events
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Poisonous Atmosphere Survival — Ky helps Jo survive the daylight-exposed poisonous atmosphere.
Location: Solos Caverns
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Terraforming Conspiracy — Doctor discovers Marshal and Jaeger plan to terraform Solos for humans only.
Location: Skybase Laboratory
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Marshal Kills Varan's Son — Marshal betrays Varan by executing his son, sparking rebellion.
Location: Skybase One
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Stubbs and Cotton Defect — Senior officers secretly ally with the Doctor against the Marshal.
Location: Skybase Corridors
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Doctor and Varan Truce — Doctor takes Varan hostage but convinces him to form a truce.
Location: Solos Caverns
Rebellion and Revelation
Varan launches a failed assault on Skybase, causing a hull breach. Jaeger reveals the terraforming is failing, and the Marshal imprisons the protagonists in a radioactive bay while lying to the Earth Investigator.
Key Events
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Cave Fumigation Rescue — Marshal fumigates caves, but Sondergaard saves the trapped group.
Location: Solos Caverns
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Tablet and Crystal Discovery — Doctor and Sondergaard find tablets and a crystal in the caves.
Location: Solos Caverns
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Mutant Life Cycle Deduction — Doctor deduces mutations are natural, accelerated by Marshal's experiments.
Location: Solos Caverns
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Investigator Dispatched — Earth government sends an Investigator to examine strange events.
Location: Earth Command
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Varan's Skybase Assault — Partly mutated Varan attacks Skybase, causing a hull breach.
Location: Skybase One
Mutation and Justice
The Doctor studies the crystal's radiation properties and secretly gives it to Ky. Ky mutates into a super-being, saves the prisoners, and executes the Marshal after the Doctor sabotages the terraformer.
Key Events
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Jaeger's Failure Revelation — Jaeger reveals terraforming is failing and poisoning the environment.
Location: Skybase Command
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Refuelling Bay Imprisonment — Marshal imprisons prisoners in a soon-to-be-radioactive bay.
Location: Radioactive Refuelling Bay
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Inquiry and Marshal's Lies — Marshal lies to the Investigator, with Doctor forced to support him.
Location: Skybase Inquiry Room
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Crystal Radiation Study — Doctor confirms crystal focuses radiation to accelerate mutation.
Location: Skybase Laboratory
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Ky's Mutation and Rescue — Ky absorbs fuel via crystal, mutating into a super-being to save prisoners.
Location: Refuelling Bay
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Terraformer Sabotage — Doctor sabotages circuits, causing overload that kills Jaeger.
Location: Skybase Terraformer
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Marshal's Execution — Ky arrives and vapourises the Marshal, dispensing justice.
Location: Skybase Command
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Doctor and Jo Departure — Doctor and Jo leave as Sondergaard and Cotton stay to help Solonians.
Location: Skybase One