Arriving on Space Station Nerva in its distant past, the Doctor, Sarah and Harry find its crew threatened by a mysterious plague. Discovering that things are not as they seem, they uncover a Cyberman plot to destroy Voga, planet of gold.

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Main Cast: Tom Baker, Elisabeth Sladen, Ian Marter, Ronald Leigh-Hunt, William Marlowe, Kevin Stoney, David Collings, Alec Wallis, Michael Wisher, Christopher Robbie

Director: Michael E. Briant

Writers: Gerry Davis, Robert Holmes

Editor: Sheila S. Tomlinson

Cinematographer:

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