In the conclusion to the six-part story "Colony in Space," the Adjudicator, sent from earth to mediate a land dispute between the colonists of the planet Uxarius and the Interplanetary Mining Corporation, has revealed himself to be the Master (Roger Delgado), longtime nemesis of the Doctor (Jon Pertwee). Now in control of a doomsday device that is worshipped as an idol by the planet's natives, the Master intends to wreak havoc throughout the Universe. Inasmuch as this story is set in the year 2472 A.D., there is no telling how things will turn out until the very end. Written by Malcolm Hulke, "Colony in Space, Episode 6" first aired on May 15, 1971. ~ Hal Erickson, Rovi