Muhammad Ali shocks the world when he defeats George Foreman in Zaire, winning back the heavyweight title, and becoming the most famous man on earth. He faces Joe Frazier in the brutal "Thrilla in Manila" and boxes for five more years before retiring in 1981. He is diagnosed with Parkinson's in 1984 but continues to travel the world spreading his Islamic faith and becomes a symbol of peace and hope.
Cast Appearances

Keith David
voices Himself (Narrator)Episode Discussion
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I updated the episode title from "Round Four: The Rent You Pay (1974-2016)" to "Round Four: The Spell Remains (1974-2016)" because it's the title used in the beginning credits of episode 4. It's also used here: https://www.pbs.org/kenburns/muhammad-ali/muhammad-ali-episode-4-full-episode-extras/.
I found websites do vary. Thetvdb uses "Round Four: The Rent You Pay (1974-2016)." But IMDb uses "Round Four: The Spell Remains (1974-2016)."