'The Mind of Evil' (6 Parts) Story Code 'FFF' by Don Houghton

The Doctor and Jo visit Strangmoor Prison, site of a demonstration of the Keller Machine, a device that is capable of extracting the negative emotions from the minds of hardened criminals. The Doctor's scepticism of the device's abilities seems valid when Barnham, a prisoner, collapses whilst undergoing the treatment. Meanwhile, UNIT, led by the Brigadier, is in charge of security at a World Peace conference. The conference is plagued by problems - documents go missing, and the Chinese delegate dies in mysterious circumstances. Captain Yates is away on another mission, transporting a banned Thunderbolt missile across the country, in order to be destroyed at another location. The Doctor joins the Brigadier at the peace conference, and they foil an attempt by Captain Chin Lee, the aid of the Chinese delegate, to kill the American delegate. Lee is under the hypnotic control of the Master, a rogue Time Lord, who is otherwise known as Professor Emil Keller. The Keller Machine actually houses an alien mind parasite, and the Master uses the evil mind impulses that are stored within it to incite a riot the prison. He then enlists the aid of the convicts to hijack the Thunderbolt missile, planning to use it to blow up the peace conference, an act that will start World War III. Barnham is now immune to the parasite's effects, and he and the Doctor transport the Keller Machine to a nearby airfield, where the missile is being held. Using the Machine to keep the Master occupied, the Doctor reconnects the missile's auto destruct circuit and, once he is clear, the Brigadier triggers it, destroying the mind parasite. However the Master escapes, running Barnham down in a van in the process.

Jon Pertwee (Dr. Who), Katy Manning (Jo Grant), Nicholas Courtney (Brigadier Lethbridge-Stewart), Roger Delgado (The Master), Richard Franklin (Captain Mikes Yates), Pik-Sen Lim (Captain Chin Lee), Raymond Westwell (Prison Governor), Michael Sheard (Dr. Summers), Simon Lack (Professor Kettering) , Neil McCarthy (Barnham), Fernanda Marlowe (Corporal Bell), Clive Scott (Linwood) , Roy Purcell (Chief Prison Officer Powers), Eric Mason (Senior Prison Officer Green); Bill Matthews, Barry Wade, Dave Carter, Martin Gordon (Prison Officers); John Levene (Sergeant Benton), William Marlowe (Mailer) -5]', Haydn Jones (Vosper), Kristopher Kum (Fu Peng), Tommy Duggan (Senator Alcott), David Calderisi (Charlie), Patrick Godfrey (Major Cosworth), Johnny Barrs (Fuller), Matthew Walters (Main Gates Prisoner)

Produced by Barry Letts
Directed by Timothy Combe

TX:
Part 1 - 30th January, 1971 @ 5.15pm - 5.40pm
Part 2 - 6th February, 1971 @ 5.15pm - 5.40pm
Part 3 - 13th February, 1971 @ 5.15pm - 5.40pm
Part 4 - 20th February, 1971 @ 5.15pm - 5.40pm
Part 5 - 27th February, 1971 @ 5.15pm - 5.40pm
Part 6 - 6th March, 1971 @ 5.15pm - 5.40pm

Notes:
*Featuring the Third Doctor, Jo, the Brigadier and UNIT

*Working titles: 'Man Hours', 'Doctor Who and Pandora's Box' and 'The Pandora Machine'

*Music heard in this episode: 'The Devil's Triangle' by King Crimson

*This story only existed as black and white film recordings, except some colour sequences from Part 6, until it was colourised by the BBC Restoration Team for its DVD release in June 2013. The story was further restored for its release in HD on Blu-Ray, in March 2021