Classic Who S13 • Serial 1 · (4 episodes)
Terror of the Zygons
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:
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...
The Zygon traps the Doctor and Sarah Jane in a decompression chamber while Harry is taken to the aliens' underwater ship.
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.
UNIT attempt to track down the Zygon ship while Broton prepares to have the Skarasen attack London.