Planet whose third moon had become a reservation for its green-skinned natives known as "Swampies", who worshipped the god Kroll. The third moon also housed a methane refinery whose controller, Thawn, tried to exterminate the Swampies. The Fourth Doctor and Romana defeated Thawn, saved the Swampies, and recovered the fifth segment of the Key to Time which had been swallowed by the gigantic Kroll (5E).

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