Format: Pre-Owned DVD The Doctor, Sarah, and Harry return to Earth in response to the Brigadier's summons. UNIT are investigating a series of attacks on North Sea oil rigs and have set up a temporary HQ in the Scottish village of Tullock. The attacks are the work of a huge cyborg, the Skarasen, controlled by a group of aliens called Zygons whose spaceship lies at the bottom of Loch Ness. The Zygons plan to take over the Earth as a substitute for their own planet, which has been devastated by solar flares. They are using their shape-shifting abilities to take on the identities of locals whose inert bodies are held aboard their ship. DVDs & Blu-ray include disc, cover art, and case. Bonus downloadable or promotional content may have already been redeemed. Promotional items (3-D glasses, figurines, t-shirts, posters, jewelry, books or other non-media items) may not be included. Cleaning and repair was done as required.