Synopsis: In the fifth episode of the six-part story "Colony in Space," the Doctor (Jon Pertwee) tries to persuade the Guardian (Norman Atkyns) of the planet Uxarius to destroy a doomsday machine that is worshipped as a god by the local natives. But he is thwarted in this pursuit by the Master (Roger Delgado), who intends to use the machine for his own nefar...
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Starring: Katy Manning, Nicholas Pennell, Jon Pertwee, Roger Delgado