Doctor Who (1963–1989)
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Terror of the Zygons: Part One 

The Doctor, Sarah and Harry are summoned back to Earth, where the Brigadier asks them to investigate the destruction of a series of North Sea oil rigs.



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Episode complete credited cast:
John Woodnutt ...
Lillias Walker ...
Robert Russell ...
Tony Sibbald ...
Hugh Martin ...
Bruce Wightman ...
Radio Operator
Keith Ashley ...


The Doctor, Sarah and Harry are summoned back to Earth, where the Brigadier asks them to investigate the destruction of a series of North Sea oil rigs.

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Release Date:

30 August 1975 (UK)  »

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Aspect Ratio:

1.33 : 1
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Did You Know?


Hibernian Oil was originally named Claymore Oil. See more »


Broton: Strength?
Zygon: Diastellic reading seven oh three.
Broton: Increase the sonic core tone by three remars.
Zygon: Increased tone, three remars. Contact firm.
Broton: Check directional pulse.
Zygon: Pulse correct to within one Earth mile. Closing.
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Followed by Doctor Who: The Day of the Doctor (2013) See more »

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User Reviews

Loch Ness monster is the only problem with this otherwise terrific story.
22 November 2014 | by (South Wales, UK) – See all my reviews

Review of all 4 episodes:

Much like many Doctor Who stories since 2005 this story is based around an iconic idea or legend (like werewolves, vampires, statues that move etc) in this case the Loch Ness monster. Ironically the realisation of the monster on screen is the only real negative in this great adventure.

The story is that an alien race called the Zygons have had a small group living in hiding in Scotland for a few hundred years and that the Loch Ness monster is actually a cyborg monster they intend to use as a weapon. The Zygons have a very long term plan to conquer Earth and change it to suit their needs in readiness for the arrival of the rest of the Zygons who are spread across the galaxy after Solar flares destroyed their home planet. The plan is kicked into action and the cyborg monster, the 'skarasen' is their main weapon.

The Zygons are fantastically good alien villains. They look brilliant, are menacing and scary as well as having good dialogue. The story is exciting, thrilling, fun and humorous and overall this is a classic. The skarasen monster is realised badly on screen. It is a pretty poor puppet and is a distraction but thankfully has very little screen time. The lack of importance given to the monster allows the story to still be a 10/10 classic. If it was re-released with a CGI monster it would eliminate that one fault but even with the occasional, disappointing appearances by the Loch Ness monster/Skarasen, this is a classic adventure of extremely high standard and great fun.

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