This documentary combines archival footage and interviews to examine the life of one of music's most universal legends, Johnny Cash. The film recounts the events of Cash's life, from his poor beginnings to his celebrity and his battle with drugs. It also delves into how Cash addressed the issues of his day and evolved to be both a patriot and a social activist. Many famous fans of Cash, including figures as disparate as Bob Dylan, Al Gore and Snoop Dogg, discuss his legacy and influence.