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You can buy "On the Double" on Apple TV, Amazon Video, Google Play Movies, YouTube, Microsoft Store as download or rent it on Microsoft Store, Apple TV, Amazon Video, Google Play Movies, YouTube online.
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.
