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.

• DirectorMichael E. Briant
• Release10 May 1975
• Genre
  Action / Adventure
• Duration1h 40m
• Budget?
• Revenue?
• Rate
  

  5.7
  9 reviews
• Productions

  BBC