Doctor Who: The Web of Fear

In order to escape an attack in space, the TARDIS makes 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. But as events take a turn for the worse, it becomes clear that the golden prize is not just the Earth, but the Doctor's mind too.