The Doctor, Ian, Barbara and Susan arrive in the TARDIS on board a spaceship. Their initial concern is for the ship's human crew, who are suffering from telepathic interference from the Sensorites, but Susan communicates with the Sensorites and finds the aliens fear an attack by the humans and are just defending themselves. Travelling to the Sense Sphere (the Sensorites' planet) the Doctor seeks to cure an illness to which the Sensorites and Ian have succumbed, but finds it has been caused by deliberate poisoning. The political manoeuvring of the Sensorite City Administrator poses another threat to the TARDIS crew as he seeks to discredit and implicate them.
Directed by Frank Cox, Mervyn Pinfield
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Cast
William Hartnell
The Doctor
Carole Ann Ford
Susan Foreman
Jacqueline Hill
Barbara Wright
William Russell
Ian Chesterton
Stephen Dartnell
John
Ilona Rodgers
Carol
Lorne Cossette
Maitland
John Bailey
Commander
Martyn Huntley
First Human
Giles Phibbs
Second Human
Peter Glaze
Third Sensorite / City Administrator
Arthur Newall
Fourth Sensorite
Eric Francis
First Elder
Bartlett Mullins
Second Elder
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