In the distant future, the Doctor, Sarah and Harry find a space station preserving the future of mankind. But the insect Wirrn have got there first...

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Main Cast: Tom Baker, Elisabeth Sladen, Ian Marter, Wendy Williams, Kenton Moore, Richardson Morgan, John Gregg, Christopher Masters, Stuart Fell, Nick Hobbs

Director: Rodney Bennett

Writer: Robert Holmes

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Cinematographer:

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