Drew "Bundini" Brown was the source of Muhammad Ali's spirit who stood by the champ during his greatest trials and tribulations both inside and outside the ring. The first ever documentary on Ali's beloved trainer/Svengali explores the extraordinary life of the man whom Ali said made him "The Greatest" through archival footage, family photos, and narration by "Bundini" biographer Todd Snyder and Bundini's only son, Drew III.