Cassius Clay joins the Nation of Islam and adopts the name Muhammad Ali. For three years, Ali dominates the heavyweight ranks but in 1967, he refuses induction into the U.S. Army and becomes one of the most reviled men in America. Ali is stripped of his title, convicted of draft evasion and forced into exile. In 1970, he triumphantly returns to the ring, but it's clear that he has lost a step.