The final segment of the Key to Time is at the heart of a devastating war between neighbouring planets Atrios and Zeos. The Fourth Doctor discovers that a sinister entity is manipulating events and the cost of obtaining the final segment may be more personal than he imagined.

• DirectorMichael Hayes
• Release24 February 1979
• Genre
  Action / Adventure
• Duration2h 30m
• Budget?
• Revenue?
• Rate
  

  5.0
  3 reviews
• Productions

  BBC