STORY
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 & CREW
- Jon Pertwee
- Katy Manning
- Nicholas Courtney
- Richard Franklin
- John Levene
Cast
- Timothy Combe
Director
INFORMATION
- BBC
Production Companies
- United Kingdom
Production Countries
LANGUAGES
- English
