Plot
American GI Ernie Williams (Danny Kaye), admittedly weak-kneed, has an uncanny resemblance to British Colonel MacKenzie (Danny Kaye). 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.
Where to watch On the Double?
On the Double is a comedy movie featuring Danny Kaye.
On the Double is currently streaming for free (ad-supported) on Plex and Plex Player.
It is also possible to buy On the Double on Amazon Video, Apple TV, Google Play Movies and YouTube.