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"I challenge you, Styre. Single combat. Or are you afraid?"
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Transmitting down from Nerva Beacon, the Doctor, Sarah and Harry find themselves on Earth in the far future, long-since abandoned by the human race. But it soon becomes clear that they are not alone: a shipwrecked crew of Galsec colonists are being hunted down, one by one. What is the creature that lives in the rocks, and what is the purpose of the lethal tests it is conducting? Can the Doctor ensure the safety of the Earth for the future generations of Mankind?
The Doctor: Tom Baker
Sarah Jane Smith: Elisabeth Sladen
Harry Sullivan: Ian Marter
Styre, The Marshal: Kevin Lindsay
Vural: Donald Douglas
Krans: Glyn Jones
Erak: Peter Walshe
Roth: Peter Rutherford
Producer: Philip Hinchcliffe
Director: Rodney Bennett
Scriptwriters: Bob Baker and Dave Martin