1971/03/06 (US) | 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.
Timothy Combe
Director
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
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Released
Don Houghton
Writer
Terrance Dicks
Script Editor
Barry Letts
Producer
Jim Ward
Visual Effects
Jan Harrison Shell
Makeup Artist
Eric Monk
Lighting Director
Chick Anthony
Sound