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.
Tom Baker , Elisabeth Sladen , Ian Marter , Ronald Leigh-Hunt , William Marlowe , Kevin Stoney , David Collings , Michael Wisher , Brian Grellis
BBC
