Sontaran Field Major Styre is conducting experiments on the survivors of future Earth in preparation of a full-scale Sontaran invasion of the planet. Can the Doctor defeat Styre and save the world?

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Main Cast: Tom Baker, Elisabeth Sladen, Ian Marter, Kevin Lindsay, Donald Douglas, Glyn Jones, Peter Walshe, Peter Rutherford, Terry Walsh, Brian Ellis

Director: Rodney Bennett

Writers: Bob Baker, Dave Martin

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Cinematographer:

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