Doctor Who DVDs: Doctor Who Classic Series

The TARDIS has materialised in a world of trench warfare, barbed wire and poison gas: the Western Front, 1917. In the chaos and paranoia of the First World War, the Doctor and his companions are separated from their ship, captured and court-martialled. The death sentence is swiftly pronounced.

The TARDIS arrives in London, 1966, where the Doctor and Dodo visit the recently opened Post Office Tower. At its top they discover a brilliant new problem-solving computer - the Will Operating Thought Analogue.

In order to escape an attack in space, the TARDIS males an unscheduled landing and ends up deep inside the London Underground. Here the travellers soon find themselves engulfed in a thrilling battle with the Great Intelligence and the Yeti, a deadly enemy set to invade the Earth. As events progress and the menace spreads, it becomes clear that the Intelligence's goal is not just possession of Earth, but the Doctor's mind too...