This high profile, special event movie chronicles Muhammad Ali's life up to 1964, when Ali faced defending world champion Sonny Liston for the World Heavyweight Championship in Miami, Florida. It depicts the rise of Cassius Clay through the amateur ranks from the Olympic Gold Medal to Championship of the World, and his transformation into Muhammad Ali. Sonny Liston was the most feared heavyweight of his time, known as 'The Bear', and Cassius Clay was a loud-mouthed upstart with the odds against him, when he knocked out Liston in a stunning upset the boxing world will never forget. Based on the book by the Pulitzer Prize-winning author David Remnick.