After being used to process a hundred twelve cases in Switzerland, Professor Keller, with the assistance of Professor Kettering, had it installed in Stangmoor Prison. Its subsequent use on George Patrick Barnham was witnessed by several people, including the Third Doctor, Jo Grant, Arthur Linwood, (TV: The Mind of Evil) and James Stevens. (PROSE: Who Killed Kennedy) It went on to kill Linwood through his fear of rats and Kettering through his fear of drowning, and almost killed the Doctor through his fear of fire (recently acquired on a trip to a parallel Earth). The Master used it to disrupt the World Peace Conference, hoping to cause World War III. Chin Lee used a telepathic amplifier to enable the machine to work on Senator Alcott, who was nearly killed by his fear of the Chinese before