Doctor Who Series 9 Episode 7 The Zygon Invasion Trailer Released

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BBC has released the first trailer for next Saturday's episode of Doctor Who: "The Zygon Invasion."

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 preview in the video below.

Doctor Who airs Saturdays at 9 p.m. ET on BBC America.