"You'll double up laughing when you see Mr. Fun On The Run!"
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.
Pfc. Ernie Williams

Lady Margaret MacKenzie-Smith

Colonel Somerset

Lady Vivian

Sergeant Bridget Stanhope

Captain Patterson

Corporal Joseph Praeger

Colonel Rock Houston

Sergeant Colin Twickenham

General Carleton Brown Wiffingham

Oberkommandant

Blankmeister

Mrs. Somerset
General Zlinkov
