The Doctor (Peter Capaldi) and Osgood (Ingrid Oliver) question a Zygon in a clip from this Saturday's episode of Doctor Who: "The Zygon Invasion." A second clip has Osgood hiding from the invading force.
The Zygons, a race of shapeshifting aliens, have been living in secret amongst 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 is too late?
Check out the sneak peeks in the videos below.
Doctor Who airs Saturdays at 9 p.m. ET on BBC America.