Professor Emil Keller has created a machine that can pacify even the most dangerous of criminals. But when the Doctor and Jo arrive at Stangmoor Prison for a demonstration, things start to go horribly wrong - especially when they discover that the Doctor's old enemy the Master is responsible for the machine.
Top Cast
Jon Pertwee as The Doctor
Katy Manning as Jo Grant
Nicholas Courtney as Brigadier Lethbridge-Stewart
Richard Franklin as Captain Mike Yates
John Levene as Sergeant Benton
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