

The Doctor breaks parole for a space squatters-vs-corporations showdown with the Master lurking.
When the Master steals the Time Lords' secret file on the Doomsday Weapon, they grant the Doctor a temporary reprieve from his exile on Earth to deal with the crisis. He and Jo arrive on the planet Uxarieus and become enmeshed in a struggle between an agrarian colony and a powerful mining corporation.
Acting
Delgado's Master steals every scene he's in, obviously.
Practical Effects
Charming BBC quarry locations standing in for alien planets.

Director
Michael E. Briant
Trivia, insights & behind the scenes
This aired during UK miners' strikes and ecological awakening, making its corporate villainy surprisingly topical for 1971.
The primitive aliens are called 'Primitives' because even the writers gave up pretending BBC budgets could do better names.
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