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Classic Who S13 • Serial 1 · (4 episodes)

Terror of the Zygons

3.78/ 5 295 votes

First aired Saturday, August 30, 1975
Production Code 4F
Directed by Douglas Camfield
Runtime 100 minutes
Time Travel Present
Inventory: (Potential Spoilers!) Sonic Screwdriver
Synopsis

Having received an urgent request for assistance from the Brigadier, the Doctor, Sarah and Harry arrive in Scotland, where they discover that a mysterious force has destroyed three oil rigs.

The mystery deepens when a piece of wreckage is found with giant teeth marks on it. The trail leads them to the shores of Loch Ness where they find that the legendary monster really does exist — and is the murderous tool of the Zygons, aliens intent on overpowering the planet.

4 Episodes:

First aired Saturday, August 30, 1975
Runtime 25 minutes
Directed by Douglas Camfield
UK Viewers 8.4 million
Appreciation Index 59

Synopsis

Scotland, the near future. Something is smashing oil rigs off the Scottish coast, and UNIT have been called in to investigate. The Brigadier summons the Doctor to Earth to help in the investigation, but it soon becomes clear some kind of alien presence is at work...

First aired Wednesday, September 3, 1975
Runtime 25 minutes
Directed by Douglas Camfield
UK Viewers 6.1 million

Synopsis

The Zygon traps the Doctor and Sarah Jane in a decompression chamber while Harry is taken to the aliens' underwater ship.

First aired Saturday, September 13, 1975
Runtime 25 minutes
Directed by Douglas Camfield
UK Viewers 8.2 million
Appreciation Index 54

Synopsis

The Doctor and the Brigadier begin to realise who the Zygon imposters among them are while Sarah Jane discovers a secret tunnel to the underwater ship.

First aired Saturday, September 20, 1975
Runtime 25 minutes
Directed by Douglas Camfield
UK Viewers 7.2 million

Synopsis

UNIT attempt to track down the Zygon ship while Broton prepares to have the Skarasen attack London.

Ratings are from TARDIS Guide members only.

Other adaptations of this story: