In July 1972, Muhammad Ali boxed Al 'Blue' Lewis in Croke Park, Dublin. The fight was organised and co-promoted by a former circus-strongman, a London-based publican called Butty Sugrue, originally from Killorglin, Co Kerry. Using RTE archive and personal footage recorded at the time, this film tells the remarkable story behind the origins of the fight - and the fall-out from it - and talks to those who encountered Ali during his time in Dublin. Among them the late RTE broadcaster, Cathal O'Shannon, in his last recorded TV interview. And, from his home in Detroit, Al 'Blue' Lewis, and tells how, having been sentenced to life in prison for manslaughter, he ended up going eleven rounds with The Greatest in Dublin.