Alec Guinness
— Flight Lt. Peter Ross
Jack Hawkins
— Air CO Frank
Muriel Pavlow
— Maria Gonzar
Anthony Steel
— John Bartlett
Renée Asherson
— Joan Rivers
Flora Robson
— Melita Gonzar
Hugh Burden
— Eden
Nigel Stock
— Giuseppe Gonzar
Stuart Burge
— Paolo Gonzar
Rosalie Crutchley
— Carmella Gonzar
Reginald Tate
— Vice Adm. Payne
Ralph Truman
— Vice Adm Willie Banks
Gordon Jackson
— British Soldier
Ronald Adam
— Operations Room Controller
Peter Barkworth
— Cypher Clerk
Ivor Barnard
— Old Man
Peter Bull
— Flying Officer
Michael Craig
— British Officer
Maurice Denham
— British Officer
Jerry Desmonde
— General
Thomas Heathcote
— Radar Operator
Geoffrey Keen
— Sergeant Major
Dermot Kelly
— British Soldier at Airport
Sam Kydd
— Army Airfield Soldier
Victor Maddern
— Army Airfield Soldier
Michael Medwin
— Ramsey
Lee Patterson
— Officer on Truck
William Russell
— Officer at Prison
Harold Siddons
— Matthews
Noel Willman
— Hobley