American GI Ernie Williams, admittedly weak-kneed, has an uncanny resemblance to British Colonel MacKenzie. Williams, also a master of imitation and disguise, is asked to impersonate the Colonel, ostensibly to allow the Colonel to make a secret trip East. What Williams is not told is that the Colonel has recently been a target of assassins. After the Colonel's plane goes down, the plan changes and Williams maintains the disguise to confuse the Nazis about D-Day.
Danny Kaye
as Pfc. Ernie Williams
Dana Wynter
as Lady Margaret MacKenzie-Smith
Wilfrid Hyde-White
as Colonel Somerset
Margaret Rutherford
as Lady Vivian
Diana Dors
as Sergeant Bridget Stanhope
Allan Cuthbertson
as Captain Patterson
Jesse White
as Corporal Joseph Praeger
Gregory Walcott
as Colonel Rock Houston
Terence de Marney
as Sergeant Colin Twickenham
Rex Evans
as General Carleton Brown Wiffingham
Rudolph Anders
as Oberkommandant
Edgar Barrier
as Blankmeister
