The Doctor and Romana learn the second segment of the Key to Time is on the planet Calufrax. Yet they arrive on a planet called Zanak, which has been hollowed out and fitted with hyperspace engines, allowing its insane, half-robot Captain to materialise it around smaller planets and plunder their resources.

• DirectorPennant Roberts
• Release21 October 1978
• Genre
  Action / Adventure
• Duration1h 40m
• Budget?
• Revenue?
• Rate
  

  6.8
  5 reviews
• Productions

  BBC