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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.
Length 150 minutes
Jon Pertwee | Katy Manning | Nicholas Courtney | Richard Franklin | John Levene | Roger Delgado | Pik-Sen Lim | Raymond Westwell | Michael Sheard | Simon Lack | Fernanda Marlowe | Neil McCarthy | Clive Scott | Roy Purcell | Eric Mason | Bill Matthews | Barry Wade | Dave Carter | Martin Gordon | William Marlowe | Hayden Jones | Kristopher Kum | Tommy Duggan | David Calderisi | Patrick Godfrey | Johnny Barrs | Matthew Walters | Timothy Combe