Centuries ago, a legendary warrior called "Iron Ace" fought by Charlemagne's side for France. When Iron Ace died, Charlemagne predicted that he would return as "the champion of freedom." During World War Two, Captain Britain, a British pilot, is shot down over France and forced to hide in the castle of Dr. LaFarge. LaFarge is the leader of a resistance group, but the Germans shoot him after they track Britain to his castle.