Captain America’s less-well-known British counterpart, Union Jack was in one of our favorite comic storylines when we were young: Captain America #253-254. If memory serves, the story involved a vampire called Baron Blood, the death of the original Union Jack, the arrival of his replacement, and some fantastic John Byrne art. Also, Cap beheaded the vampire with his shield. Awesome!
Colored version first (click the images for a larger view):
Now, the black-and-white: