An early serial from the long-running BBC television series starring William Hartnell as the original Doctor Who. When the Doctor and his fellow travellers on the TARDIS board a moving spaceship they are surprised to discover that its occupants appear to be dead. Ian Chesterton (William Russell) finally manages to revive a few of the crew and discovers that they have been banned from leaving the orbit of the nearest planet, Sense-Sphere.

A number of Sensorites, the race that inhabits the planet, subsequently arrive on the ship and threaten the Doctor and his comrades in a similar manner. A battle of wits ensues in which the humans, aided by the Doctor, attempt to escape the clutches of their alien captors.

Note: This is an imported product that has been officially rated by the Film and Video Labelling Body of New Zealand. As this is sourced from overseas, the discs may not play on standard DVD players.