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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.
as Doctor Who
as Sarah Jane Smith
as Harry Sullivan
as Commander Stevenson
as Lester
as Tyrum
as Vorus
as Warner
as Magrik
as Cyber-Leader
as First Cyberman
as Seprah
