After the lighter elements of the previous episodes, it’s back to a more serious and traditional Doctor Who adventure as this year’s fourth two-parter, starting with The Zygon Invasion, picks up the story of the human/Zygon peace treaty that we saw negotiated in the The Day of the Doctor.
We have been long overdue a proper Zygon story. In addition to the 50th anniversary special, they previously appeared only in the Fourth Doctor adventure Terror of the Zygons, although they were mentioned twice during Matt Smith’s tenure, in The Pandorica Opens and The Power of Three.
Peter Harness’s second Who story (after last year’s Kill the Moon) sends the Doctor, Clara and Kate Stewart to… Read the full story