The Zygon Invasion was the seventh episode of the ninth series of Doctor Who produced by BBC Wales.

This story is the first to be a sequel to a previous story, in this case the 50th Anniversary Special The Day of the Doctor, having a sequence dedicated to show the beginning of the plot point of this story.


A long time ago, the Doctor made a deal in the Tower of London. 20 million Zygons walk among us, in human form, living undetected in peace and harmony. But cracks are showing in this delicate peace. Humans and Zygons are disappearing. In city apartment blocks, lifts are going missing, and far below the streets of Britain, alien pods are growing in secret caverns. To top it all off, UNIT's scientific advisor, Osgood, sends a desperate message to the Doctor - but since Osgood is long dead, how is that even possible?

The Doctor, Clara and UNIT must scatter across the world in a desperate bid to set her free. But in a world of shape-shifting aliens, who can you trust? And can the world be saved before it's too late?


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Uncredited cast


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The Doctor




Story notes

  • The Radio Times programme listing was accompanied by a small colour shot of Osgood and the Doctor, with the accompanying caption "Doctor Who / 8.15 p.m. Osgood is snatched by aliens, prompting a round-the-world rescue mission".
  • Given that the "Clara" in most of this episode is a Zygon duplicate, this is the second consecutive episode in which the real Clara is only onscreen for a brief moment.


  • BBC One: 3.87m

Filming location

  • Italy ("New Mexico" scenes)

Production errors

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Home video releases

DVD releases

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Blu-ray releases

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External links

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  1. Think I was just left off the credits of Doctor Who just now. I did the Zygon voices. If I'm mistaken, apologies. Credits move so fast ;-) - Nicholas Briggs on Twitter
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