Doctor Who: The Mind of Evil

• Cast: Jon Pertwee, Katy Manning, Nicholas Courtney, Richard Franklin, John Levene
• Duration: 150 minutes
• Genre: Science Fiction, Drama, Adventure
• Rating: 7.2/10
• Release Date: 1971-03-06

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.