Terror of the Zygons

Terror of the Zygons 

Terror of the Zygons 
Terror of the Zygons


In this thrilling adventure The Doctor (Tom Baker) finds himself defending Earth from invasion by shape-changing aliens!

Arriving in Scotland at the request of his old friend the Brigadier, The Doctor discovers that the mysterious force which has destroyed three oil rigs has left giant teeth marks on the wreckage. The mystery deepens as the trail leads to the shores of Loch Ness…

Part-cyborg, part-organic creature the Monster of legend exists! It is the murderous tool of the Zygons, alien creatures intent on taking possession of the planet.

The Doctor and his companions must find a way to defeat The Zygons and their deadly Loch Ness Monster but the Zygons have terrifying powers to assume human shape and the Doctor finds that his friends and allies are not always what they seem…

Episode entry


  • Terror of the Zygons was the first episode of season 13
  • The Brigadier will not appear again till Mawdryn Undead
  • Zygons make their debut
  • This story had working titles of: Loch Ness, The Secret of the Loch, Secret of Loch Ness, The Loch Ness Monster and The Zygons.
  • This story was originally planned to end Season 12, but was pushed back to the start of Season 13 to allow the series to shift its broadcast schedule from a January start (its routine since 1970) to September

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