In the mirror universe, Martin Luther King, Jr. was a Terran anti-authoritarian philosopher who lived on Earth during the 20th century. By the 23rd century, his speeches advocating personal freedom were banned by the Terran Empire, as were those of numerous other Terrans who had expressed similar views throughout Earth's history. In 2274, the 13-year-old David Marcus, who was then living on Imperial Starbase 47, was able to procure transcripts of suppressed speeches made by King and others.