The Zygon InvasionSeries Episode Number: 820
World Premiere: Sat 31 Oct 2015 - 8:17pm GMT [BBC One] (United Kingdom)
First Broadcast: Sat 31 Oct 2015 - 9:00pm EDT [BBC America]
Running Time: 46 minutes 30 seconds
5.76 Million (UK)Appreciation Index: 82 (UK)
Audience Share: 24.3% (UK)
Chart Position: 24 () (UK)
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?