On the occasion of Muhammad Ali's 70th birthday, Sir David Frost charts the life and career of the world's greatest sportsman through a series of landmark interviews.
Frost meets Ali at his ranch in Michigan and together they look back over the boxer's glittering career and talk about the Parkinson's disease that now blights the former champion's life.
The programme also includes excerpts from two of their greatest encounters - in 1968 when Ali declared that all 'white men are devils' and in 1974 when they met at Ali's training camp at Deer Lake prior to the historic Rumble in the Jungle fight with George Foreman.
This is a live stream of BBC Four. Programme begins 2200 GMT.
Available to UK users only.