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File:Zygons 3776.jpg
"Oil? An emergency? Ha! It's about time the people who run this planet of yours realised that to be dependent on a mineral slime just doesn't make sense."
The Doctor doesn't agree with the Brigadier's assessment.

The TARDIS arrives on Earth following the Brigadier's summons. UNIT are investigating a series of attacks on North Sea oil rigs from a temporary base in the Scottish village of Tulloch. The Doctor discovers that the attacks are the work of a giant cyborg controlled by an alien race called the Zygons from their ship beneath Loch Ness. The Zygons can imitate the form of other life-forms whom they have imprisoned on their ship, and are currently impersonating many of the village locals in order to infiltrate the UNIT base.

The Zygons plan to use their shapeshifting abilities to take over the world as a substitute for their own dead planet, but the Doctor releases the prisoners and destroys the ship, killing all but one of the Zygons. The survivor, Broton, makes his way to London disguised as the Duke of Forgill, planning to destroy a World Energy Conference using the cyborg, known as the Skarasen, and use this show of strength to persuade the world to give in to his demands. However, before he can do so, he is shot by UNIT, and the Doctor feeds the tracking device to the Skarasen. With no more control, the Skarasen returns to the only home it knows - Loch Ness. Harry decides he's had enough of this time-travel lark and remains on Earth while the Doctor and Sarah depart for adventures new.


 "You have to step out on a balcony from time to time and wave a gracious tentacle."

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