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.
Cast
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 Lee
Raymond Westwell
Prison Governor
Michael Sheard
Dr. Roland Summers
Simon Lack
Professor Kettering
Fernanda Marlowe
Corporal Bell
Neil McCarthy
George Patrick Barnham
Clive Scott
Arthur Linwood
Roy Purcell
Chief Prison Officer Powers
Eric Mason
Senior Prison Officer Green
Bill Matthews
Prison Officer
Barry Wade
Prison Officer
Dave Carter
Prison Officer
Martin Gordon
Prison Officer
William Marlowe
Mailer
Hayden Jones
Vosper
Kristopher Kum
Fu Peng
Tommy Duggan
Senator Alcott
David Calderisi
Charlie
Patrick Godfrey
Major Cosworth
Johnny Barrs
Fuller
Matthew Walters
Main Gates Prisoner
Timothy Combe
Prisoner (uncredited)
Crew
Timothy Combe
Director
Don Houghton
Writer
Terrance Dicks
Script Editor
Howard Billingham
Editor
Sam Upton
Editor
Roger Harvey
Editor
Barry Letts
Producer
Ray London
Production Design
Fred Hamilton
Camera Operator
Max Samett
Camera Operator
Bobi Bartlett
Costume Design
Jan Harrison Shell
Makeup Artist
Chick Anthony
Sound
Eric Monk
Lighting Director
Jim Ward
Visual Effects
Dudley Simpson
Original Music Composer
Delia Derbyshire
Theme Song Performance
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