On the planet Vortis, the Doctor and his companions aid the butterfly-like Menoptra in their battle against the parasitic Animus and its mind-controlled minions, the ant-like Zarbi.

• DirectorRichard Martin
• Release20 March 1965
• Genre
  Science Fiction / Drama
• Duration2h 30m
• Budget?
• Revenue?
• Rate
  

  5.7
  6 reviews
• Productions

  BBC