Alec Guinness as Flight Lt. Peter Ross

Jack Hawkins as Air CO Frank

Muriel Pavlow as Maria Gonzar

Anthony Steel as John Bartlett

Renée Asherson as Joan Rivers

Flora Robson as Melita Gonzar

Hugh Burden as Eden

Nigel Stock as Giuseppe Gonzar

Stuart Burge as Paolo Gonzar

Rosalie Crutchley as Carmella Gonzar

Reginald Tate as Vice Adm. Payne

Ralph Truman as Vice Adm Willie Banks

Gordon Jackson as British Soldier

Ronald Adam as Operations Room Controller

Peter Barkworth as Cypher Clerk

Ivor Barnard as Old Man

Peter Bull as Flying Officer

Michael Craig as British Officer

Maurice Denham as British Officer

Jerry Desmonde as General

Thomas Heathcote as Radar Operator

Geoffrey Keen as Sergeant Major

Dermot Kelly as British Soldier at Airport

Sam Kydd as Army Airfield Soldier

Victor Maddern as Army Airfield Soldier

Michael Medwin as Ramsey

Lee Patterson as Officer on Truck

William Russell as Officer at Prison

Harold Siddons as Matthews

Noel Willman as Hobley