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