Doctor Who: Terror of the Zygons

Terror of the Zygons is the first serial of the thirteenth season of the British science fiction television series Doctor Who, which was the first broadcast in four weekly parts on BBC1 from 30 August to 20 September 1975.

The Fourth Doctor, Sarah Jane Smith and Harry Sullivan arrive, via the TARDIS, in Scotland, near the North Sea, where Brigadier Lethbridge-Stewart and U.N.I.T. are investigating the destruction of oil rigs. The survivors’ assertion that the rigs were destroyed by a huge sea creature is corroborated by giant tooth marks in the wreckage.

During their investigation, Harry is captured by the Zygons, a shapeshifting alien race hiding in their submerged spacecraft. Their leader, Broton, tells Harry that their spaceship had sustained damage and landed on Earth centuries ago to await rescue, but when they discovered that their home planet had been destroyed in a stellar explosion, they decided instead to conquer the Earth and terraform it to suit their physiology.

To achieve this goal, they have captured several humans to use as “body prints” to infiltrate key leadership positions, including the influential Duke of Forgill who serves as head of the Scotland Energy Commission. They had also brought an embryonic sea creature called the Skarasen to Earth, and augmented it with cyborg technology until it has reached giant proportions. The Zygons are directing it with a signalling device to attack the rigs as part of their larger plan.

Whilst investigating the similarity between the Skarasen and the monster in nearby Loch Ness, Sarah Jane stumbles upon a secret passageway at the Duke of Forgill’s mansion. She follows the passage to the Zygons’ submerged spacecraft. Whilst searching the ship she locates and frees Harry, who reveals the Zygon stratagem.

With their presence discovered, Broton accelerates the Zygons’ plan. He takes the Duke’s form and leaves for London, while the remaining Zygons fly their ship to a nearby quarry. Once there, the Zygons use reactors to convert the Earth’s atmosphere to one hospitable to Zygons, but poisonous to humans. The Doctor sneaks aboard the ship, frees the remaining humans and sets the ship to self-destruct, killing the Zygon crew.

Among the rescued humans, the Duke warns that he was scheduled to attend the first international energy conference in London that day, at which several high-level dignitaries will be in attendance. With the conference located in a building near the Thames, the Doctor fears that Broton will lure the Skarasen to attack the conference. U.N.I.T. races them to London but, before the Doctor can stop him, Broton activates the signalling device.

The Brigadier kills Broton, and the Doctor recovers the device just as the Skarasen surfaces. The Doctor throws the device into the Thames, the creature eats it and, no longer a threat, returns to Loch Ness.

The group returns to Scotland to close up the investigation, and the Brigadier reports that the Cabinet will cover up the incident. The Doctor offers them all a return trip back to London via the TARDIS, but the Brigadier and Harry decline.

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