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This Earth-like planet was the home of a human colony. It was taken over by the Macra, who forced the colonists to mine a deadly gas they required to breathe. The Doctor and his companions visited the planet and freed the colonists.
This Earth-like planet was the home of a human colony. It was taken over by the Macra, who forced the colonists to mine a deadly gas they required to breathe. The Doctor and his companions visited the planet and freed the colonists.