Martin Luther King was a famous human peacemaker who was shot. (PROSE: The Also People) This assassination occurred in 1968; it led to many riots in the United States of America. (AUDIO: The Age of Revolution)
Bernice Summerfield once had a dream where she was debating whether humans were evil with a Cyberman, a Dalek, a Sontaran, and Kadiatu Lethbridge-Stewart; the Cyberman brought up Martin Luther King's assassination as an example of humanity's freedom of choice allowing for conflicting moralities. (PROSE: The Also People)
In 2608, copies of the works of Martin Luther King were kept in the Depository. (AUDIO: The Diet of Worms)
Behind the scenes
Stock footage of a speech by Martin Luther King was used in the television story Remembrance of the Daleks.
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During the Monk's invasion of Earth, a picture of Martin Luther King was shown on one of the screens inside the Cathedral. (TV: The Lie of the Land)