DOPPELGANGER versus CAPTAIN AMERICA
Dark Dawn (Marvel comics)
Where: Captain America #408 When: October 1992
Why: Mark Gruenwald How: Rik Levins
The story so far...
The deadly Nightshade teams with Dredmund, lord of the werewolves, in a sinister scheme to turn the people of Massachusetts into werewolves -- including the super-soldier himself, Captain America!
Fortunately for him the combined might of he, Man-Wolf John Jameson, Wolfsbane, Wolverine and others sees the day saved, but before Cap can be cured of his lycanthropy there's another shocking surprise in store!
Unbeknownst to he, a secret war is being waged by the evil spirit of Adam Warlock, Magus! Creating sinister doppelgangers of Earth's greatest heroes, Magus sends his shadows out to do battle with their counterparts. Suffering fatigue of battle and Nightshade's cure, can Cap defeat his dastardly doppelganger, or is it curtains for America's greatest warrior?
Full Article: http://secretearths.blogspot.com/2007/09/doppelganger-versus-captain-america.html