2h 30m
•
Science Fiction
Drama
Adventure
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.
User rating
7.5 / 10
11 votes
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
Michael Sheard
Dr. Roland Summers
Neil McCarthy
George Patrick Barnham
William Marlowe
Mailer
Kristopher Kum
Fu Peng
Tommy Duggan
Senator Alcott
Patrick Godfrey
Major Cosworth
Timothy Combe
Prisoner (uncredited)