Colony in Space is the fourth serial of the eighth season of the British science fiction television series Doctor Who, which was first broadcast in six weekly parts on BBC1 from 10 April to 15 May 1971.
Three Time Lords discuss the theft of confidential files relating to “the Doomsday Weapon.” They realise that only the Third Doctor can help them, so he is sent to the desert planet of Uxarieus in the year 2472. There he finds an outpost of human colonists struggling to make a living as farmers. The colony’s governor, Robert Ashe, welcomes them.
Two colonists die in a reptile attack that night. The Doctor investigates and discovers the deaths are in fact the work of operatives from the Interplanetary Mining Corporation, attempting to scare off the colonists so it can mine the planet for rare minerals.
An Adjudicator from Earth is sent for to deal with the complex claims over the planet. The Adjudicator, actually the Master in disguise, rules that the mining company’s claim to the planet is stronger. IMC takes over the colony and demands all the colonists leave the planet.
The Master tells the Doctor that the native people of Uxarieus, known as the “primitives,” were once an advanced civilisation. Before declining, they built a super-weapon that was never used and the Master wants this weapon for himself. The Doctor rejects the Master’s overture to help him rule the galaxy using the weapon. One of the elder primitives instructs the Doctor to activate the self-destruct, which he does, and the city begins to crumble.
The colonists now emerge from hiding and kill or overpower the IMC men. Amid the confusion, the Master escapes. With the battle over, the Doctor explains that the radiation from the weapon was what was killing their crops. Earth has agreed to send a real Adjudicator to Uxarieus. The Doctor and Jo return to the TARDIS, returning to UNIT Headquarters mere seconds after it left.
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To view the list of other Doctor Who serials, please click this link
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