The synopses and broadcast times have been revealed for The Zygon Invasion and The Zygon Inversion.
The Zygon Invasion airs at 20:15 on 31st October.
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?
The Zygon Inversion airs at 20:00 on 7th November.
Shapeshifting Zygons are everywhere in the UK, and there is no way of knowing who to trust. With UNIT neutralised, only the Doctor stands in their way. But how do you stop a war? And what can the Doctor do to save his friends?