The BBC have released a synopsis for episode seven of Series 9, The Zygon Invasion, written by Peter Harness (Kill the Moon) and directed by Daniel Nettheim. This episode will also feature the return of Jemma Redgrave as Kate Stewart and Ingrid Oliver as Osgood. You can read the synopsis below:
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 Invasion airs Saturday, 31 October on BBC One and BBC America.
[Source: Doctor Who TV]