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)
Behind the scenes
Stock footage of a speech by Martin Luther King was used in the television story Remembrance of the Daleks.