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In the fifth episode of the six-part story "The Mind of Evil," the Master (Roger Delgado) has set his latest plan in motion. This time, he intends to use the combined negative energy gleaned from imprisoned criminals to seize a nerve-gas missile, with which he hopes to bomb a world peace conference. Will the Doctor (Jon Pertwee) be able to deactivate the weapon in time to save the delegates from descending into mass hatred? Written by Don Houghton, "The Mind of Evil, Episode 5" first aired on February 27, 1971. Originally filmed in color, this episode currently exists only in a black-and-white version.