Judy Davis as Joan Fraser Welch

Sam Neill as David 'Dave' Hoyle, aka Agent 'Nine'

F. Murray Abraham as Josef 'Uncle Joe' Stalin

Richard Roxburgh as Joseph 'Joe' Welch

Rachel Griffiths as Constable Anna Welch

Geoffrey Rush as Zachary Welch

Russell Kiefel as Barry Rogers

John Gaden as Prof. C.W. 'Wilf' Wilke

Kenneth Radley as Bernard Shaw

Ben McIvor as Joe Welch at 8 Years

Fiona Press as Mavis Craig

Rowan Woods as Colin 'Col' Slansky

Alex Menglet as Yuri Nikolayev

Barry Langrishe as Ted

Ron Haddrick as Sir Allan Miles

Graham Ware Jr. as Harry

Heather Mitchell as Mrs. Savage

Robbie McGregor as Minister Frank

Paul Livingston as Beria

Dennis Watkins as Khrushchev

Stephen Abbott as Malenkov

Harold Hopkins as Police Commissioner

Roy Billing as Police Sergeant

Charles Little as Doctor