Investigating mysterious power failures and a death at an underground research centre, The Doctor discovers a colony of Silurians - prehistoric, intelligent reptiles who went into hibernation before man evolved. But now they have woken up, and they are prepared to wipe out mankind with a killer plague to get their planet back.

• DirectorTimothy Combe
• Release14 March 1970
• Genre
  Science Fiction / Drama
• Duration2h 55m
• Budget?
• Revenue?
• Rate
  

  7.1
  8 reviews
• Productions

  BBC