HBO has released the first full trailer for director Stephen Frears’ (The Queen) new film Muhammad Ali’s Greatest Fight.  The pic focuses on Muhammad Ali’s refusal to go to Vietnam and the court battle that ensued, centering on Justice Harlan (Christopher Plummer) and his clerk, played by Abraham Lincoln: Vampire Hunter star Benjamin Walker.  Ali’s is portrayed using archival footage, as the majority of the film involves the internal debates between the justices and clerks who faced an incredibly tough decision at a tumultuous time for America.  There’s certainly plenty of conflict to draw from, but I’m interested to see if Frears can keep the film engaging given its limited scope.

Hit the jump to watch the full trailer.  The film also stars Frank LangellaDanny GloverBob BalabanEd Begley Jr.Barry Levinson, and Pablo Schreiber.  Muhammad Ali’s Greatest Fight premieres on HBO on October 5th.