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Doctor Who S9 • Episode 7

The Zygon Invasion

3.66/ 5 536 votes

First aired Saturday, October 31, 2015
Written by Peter Harness
Directed by Daniel Nettheim
Runtime 45 minutes
Story Type Two-Parter
Time Travel Present
Story Arc: (Potential Spoilers!) The Zygon Treaty
UK Viewers 5.76 million
Appreciation Index 82
Synopsis

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?

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