Graverobbers open the grave of the Wolfman and awake him. He doesn’t like the idea of being immortal and killing people when the moon is full, so he tries to find Dr. Frankenstein, in the hopes that the Dr. can cure him, but Frankenstein is dead and only his Monster is alive and this one wants to live, not to die like the Wolfman.

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.