Cassius X: Becoming Ali follows the early years of Cassius Clay, from bright-eyed rookie to world heavyweight champion and from working class intellectual to one of America’s most influential civil rights campaigners. The film reveals how the teachings of Elijah Muhammad, reinforced by a friendship with revolutionary preacher, Malcolm X, set Clay on the journey to become "Cassius X", before his induction to the Nation of Islam and ascension to the name of the great Muhammad Ali. Cassius X: Becoming Ali is the extraordinary story of how one young boxer from Louisville, Kentucky became a cultural icon for the ages, forever to be known thereafter as “The Greatest”.