Martin Luther King Jr (PROSE: The Gallifrey Chronicles) was a famous human peacemaker. and also a Baptist preacher. Ryan Sinclair met Martin Luther King while visiting Alabama in 1955. He remarked how his grandmother, Grace O'Brien, admired Martin Luther King for the work he would go on to do. (TV: Rosa)
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.
Philip Purser-Hallard notes in his commentary of PROSE: Of the City of the Saved... that the fact that a statue of the first Lord Mayor of the City of the Saved is the centrepiece of King Square could point to the first Lord Mayor being Martin Luther King.