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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Verdict: Unknown
> Michael E. Briant (Director)
> Derek Slee (Lighting Director)
> Robert Holmes (Writer)
> Gerry Davis (Writer)
> Robert Holmes (Script Editor)