Doctor Who: The Mind of Evil (1971)
Average Score: 7.2 (rated by 8 viewers)
Overview
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.
Genres
Science Fiction, Drama, Adventure