Told through performances, TV interviews, home movies, family photographs, private letters and unpublished memoirs, the film reveals the essence of an extraordinary woman who rose from humble beginnings in New York City to become a glamorous international superstar and one of the greatest artists of all time.
| Actor | Role |
|---|---|
 Maria CallasSelf (archive footage) | Self (archive footage) |
 Joyce DiDonatoSelf - Narrator / Voice of María Callas (voice) | Self - Narrator / Voice of María Callas (voice) |
 King Edward VIII of the United KingdomSelf (archive footage) | Self (archive footage) |
| WWallis SimpsonSelf (archive footage) | Self (archive footage) |
| AAristotle OnassisSelf (archive footage) | Self (archive footage) |
| GGiovanni Battista MeneghiniSelf (archive footage) | Self (archive footage) |
| RRudolf BingSelf (archive footage) | Self (archive footage) |
 David FrostSelf (archive footage) | Self (archive footage) |
 Barbara WaltersSelf (archive footage) | Self (archive footage) |
| EElvira de HidalgoSelf (archive footage) | Self (archive footage) |
 Edward R. MurrowSelf (archive footage) | Self (archive footage) |