Plunged into the middle of a desperate mission by his new masters, the Doctor is delighted to be reunited with Brigadier Lethbridge-Stewart of UNIT near Cape Wrath, Scotland. The Doctor’s arrival coincides with the sighting of black cylinders in the sky and an attack on a trawler by a ‘creature o’ the sea.’

The Doctor quickly realises he is dealing with Ice Warriors and investigates with the help of the Brigadier and local crofter Sheena Flynn. With a space fleet lurking in the vicinity of Jupiter, the Doctor believes the Martians are planning a new invasion of Earth – but who is the true enemy?

Battle lines are drawn and the Doctor races against time to prevent Earth being caught in the crossfire.

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