
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.
Directed by Timothy Combe
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TrailerOfficialMind of Evil | Doctor Who DVD
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Cast

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
Raymond Westwell
Prison Governor

Michael Sheard
Dr. Roland Summers
Simon Lack
Professor Kettering
Fernanda Marlowe
Corporal Bell

Neil McCarthy
George Patrick Barnham
Clive Scott
Arthur Linwood

Roy Purcell
Chief Prison Officer Powers
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