

06/03/1971
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.

Jon Pertwee
as The Doctor

Katy Manning
as Jo Grant

Nicholas Courtney
as Brigadier Lethbridge-Stewart

Richard Franklin
as Captain Mike Yates

John Levene
as Sergeant Benton

Roger Delgado
as The Master

Pik-Sen Lim
as Captain Chin Lee

Raymond Westwell
as Prison Governor

Michael Sheard
as Dr. Roland Summers

Simon Lack
as Professor Kettering

Fernanda Marlowe
as Corporal Bell

Neil McCarthy
as George Patrick Barnham

Clive Scott
as Arthur Linwood

Roy Purcell
as Chief Prison Officer Powers

Eric Mason
as Senior Prison Officer Green

Bill Matthews
as Prison Officer

Barry Wade
as Prison Officer

Dave Carter
as Prison Officer

Martin Gordon
as Prison Officer

William Marlowe
as Mailer

Hayden Jones
as Vosper

Kristopher Kum
as Fu Peng

Tommy Duggan
as Senator Alcott

David Calderisi
as Charlie

Patrick Godfrey
as Major Cosworth

Johnny Barrs
as Fuller

Matthew Walters
as Main Gates Prisoner

Timothy Combe
as Prisoner (uncredited)
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