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''The Mind of Evil'' is the second serial of the eighth season of the British science fiction television series ''Doctor Who'', which was first broadcast in six weekly parts from 30 January to 6 March 1971. At Stangmoor Prison in England, the Master is posing as Emil Keller, a Professor of Criminology who has invented a machine which removes the negative (or evil) impulses from the minds of hardened criminals, but which actually contains an alien mind parasite that feeds on these evil impulses. He is plotting to start World War III by destroying the World Peace Conference in London. To do so, he plans to employ a nerve gas missile, stolen for him from U.N.I.T. by the prisoners; but in case his plan to hijack the missile is thwarted, he is using the mind parasite (once it has fed sufficiently) to wreck the peace conference by murdering the American and Chinese delegates, who are to be killed by the mind parasite's telepathic powers. ==Plot== The Third Doctor and Jo Grant visit the remote Stangmoor Prison to examine a new method of "curing" criminals, whereby the negative impulses are removed from the mind using the Keller Machine to enact the Keller Process. Professor Kettering, who is managing the use of the Process at the behest of the absent Emil Keller, reconditions a number of inmates including Barnham, a hardened criminal who reverts to an innocent and childlike state due to the Process. The Doctor’s suspicions about the Keller Machine are heightened following a string of deaths, including that of Kettering himself, which seem to occur when the Machine is operated. Each death seems to be triggered by visions of personal phobias – and the Doctor is threatened by an inferno when he gets too close to it. Meanwhile, Brigadier Lethbridge-Stewart and the troops of UNIT are handling the security arrangements for the first World Peace Conference. Captain Chin Lee of the Chinese delegation, whose delegate leader is dead, is behaving strangely, and attempting to heighten tension in relations with the United States. It emerges that her actions are under the influence of the Master. She uses the transmitted power of the Keller Machine against the American delegate, Senator Alcott, who barely survives the attack. Captain Chin Lee is deconditioned by the Doctor, and tells him that Emil Keller is in truth the Master, whom the Doctor has previously trapped on Earth by stealing the dematerialisation circuit of his TARDIS. Back at Stangmoor a riot has broken out and resulted in a dangerous criminal who was next in line for the Keller Process, Harry Mailer, seizing control of the prison. Jo is briefly taken hostage, but she enables the guards to retake the prison. The Master, who had heard of the Stangmoor riot by eavesdropping on UNIT, arrives and meets Mailer, to whom he supplies enough gas grenades for Mailer and his prisoners to retake control of the prison. The Doctor returns to the prison to be captured by the Master, who sets the Keller Machine loose on the mind of his old foe, weakening the Doctor considerably. The Master is losing control of the Keller Machine, which contains a dangerous alien Mind Parasite, and forces the Doctor to help him contain its power. This done, the Doctor is imprisoned once more. The Master has come to Stangmoor to engage the prisoners as a private army, and uses them to hijack a UNIT convoy transporting a deadly Thunderbolt missile. The stolen missile is then pointed at the Peace Conference and Captain Mike Yates, who was leading the convoy, is taken prisoner by the criminals. Left in the dark, the Brigadier decides the Thunderbolt missile must be in Stangmoor and comes to the rescue in a "Trojan Horse" style assault. UNIT troops take control of the prison, killing Mailer and the other leading rioters. A freed Yates makes contact to tell UNIT that the Thunderbolt is being kept in an abandoned hangar nearby. The Keller Machine is growing stronger and breaks free of the temporary restraints placed on it by the Doctor. The Doctor contacts the Master, who has gone to the hangar with the missile, and offers to return his dematerialisation circuit in exchange for the missile. The Master agrees to this proposition on the guarantee he will come alone. The Doctor has worked out that Barnham, having been subjected to the Keller Machine once and having no evil in his mind anymore, is immune to its growing power and uses the prisoner as a shield in transporting the Machine to the hangar for his showdown with his enemy. In the ensuing fight the Thunderbolt self-destruct mechanism is triggered and the Machine destroyed. The Master uses the chaos to escape with the dematerialisation circuit, killing Barnham in the process. He contacts the Doctor by telephone to taunt him that he is now free while the Doctor remains trapped in his exile on Earth. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「The Mind of Evil」の詳細全文を読む スポンサード リンク
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