Doctor Who: The Mind of Evil
3/6/1971
Imdb:
Tmdb: 437573
Popularity: 2.184
Vote: 7.2/10 (6)

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.