This documentary covers Muhammad Ali’s toughest bout: his battle to overturn his five-year prison sentence for refusing U.S. military service. The film traces a formative period in Ali’s life, one unknown to young people and neglected by those who remember him as a boxer but overlook how controversial he was when he first took center stage. When Cassius Clay became Muhammad Ali, he found himself caught up in conflicts concerning civil rights, religion and wartime dissent. This film focuses on the years 1967 to 1970, when Ali lived in exile within the U.S., stripped of his heavyweight belt and banned from boxing, sacrificing fame and fortune on principle.