Title from container. Originally transmitted June 20-August 1, 1964. "Story no. 7." DVD extras: Audio commentary by actors; Looking for Peter; vision on; Secret voices of the sense-sphere; photo gallery; PDF materials. William Hartnell, William Russell, Jacqueline Hill, Carole Ann Ford.
Summary:
The Doctor, Ian, Barbara and Susan land on a spaceship orbiting a distant and mysterious world, where a human crew lies frozen somewhere between life and death. The planet is the Sense-Sphere, home of the Sensorites, beings of immense intelligence and power. Unable to leave, the Doctor and his companions must deduce the Sensorites' intentions: are they friendly, hostile, or frightened? And what is the deadly secret at the heart of the Sense-Sphere?
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