Aired 9 years ago - Oct 31, 2015
The Zygons, a race of shapeshifting aliens, have been living in secret among us on Earth, unknown and unseen - until now! When Osgood is kidnapped by a rogue gang of Zygons, the Doctor, Clara and UNIT must scatter across the world in a bid to set her free. But will they reach her in time, and can they stop an uprising before it’s too late?
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