

11 votes
1971
2h 30m
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.
Directed by Timothy Combe

Jon Pertwee
The Doctor
Katy Manning
Jo Grant
Nicholas Courtney
Brigadier Lethbridge-Stewart
Richard Franklin
Captain Mike Yates
John Levene
Sergeant Benton
Roger Delgado
The Master
Pik-Sen Lim
Captain Chin LeeRaymond Westwell
Prison Governor
Michael Sheard
Dr. Roland SummersSimon Lack
Professor KetteringFernanda Marlowe
Corporal Bell
Neil McCarthy
George Patrick BarnhamClive Scott
Arthur Linwood
Roy Purcell
Chief Prison Officer PowersEric Mason
Senior Prison Officer GreenBill Matthews
Prison OfficerBarry Wade
Prison OfficerDave Carter
Prison OfficerMartin Gordon
Prison Officer
William Marlowe
MailerStatus
Released
Release date
March 6, 1971
Budget
—
Revenue
—
Language
English

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