The Zygon Inversion
Series 9 Episode 8
Shapeshifting Zygons are everywhere in the UK, and there is no way of knowing who to trust. With UNIT neutralised, only the Doctor stands in their way. But how do you stop a war? And what can the Doctor do to save his friends?
Series 9: Part 2 DVD & Blu-ray
Doctor Who - Series 9: Part 2
Released 4th January 2016

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Buy Blu-ray online: BBC Shop