Peter Davison stars as The Fifth Doctor in this classic four-part adventure. The Doctor finds himself on a seemingly deserted alien spacecraft, just four days away from its final destination - Earth. On board they encounter the frog-like Urbankans and a population of human androids. The Doctor soon uncovers the Urbankans’ sinster plan to conquer the Earth and plunder it for raw materials which will enable them to travel back in time. The fate of mankind is in The Doctor’s hands. Can he save humanity from destruction? Includes a whole host of out-of-this-world special features.