Constructed from a wealth of archival footage, the documentary follows Dr. Martin Luther King, Jr. from 1955 to 1968, in his rise from regional activist to world-renowned leader of the Civil Rights movement. Rare footage of King's speeches, protests, and arrests are interspersed with scenes of other high-profile supporters and opponents of the cause, punctuated by heartfelt testimonials by some of Hollywood's biggest stars.

In 1960, United Nations: the Global South ignites a political earthquake, musicians Abbey Lincoln and Max Roach crash the Security Council, Nikita Khrushchev bangs his shoe denouncing America’s color bar, while the U.S. dispatches jazz ambassador Louis Armstrong to the Congo to deflect attention from its first African post-colonial coup.