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.
Release Date: March 06, 1971
February 16, 1962
May 02, 1997
June 08, 1999
July 26, 2002
July 25, 2001
February 07, 1968
November 18, 2022
November 22, 1989
November 26, 1986
May 25, 1990
November 22, 1996
October 26, 1984
July 02, 2003
January 17, 2018
September 15, 2015
July 03, 1985
January 19, 2001
April 05, 2019
November 23, 2023
July 10, 1982