The Unknown was an American who joined the French in battle against the Nazis in World War II. He was injured in the line of duty and became amnesiac, forgetting his own name and country. He wandered into the battle of Dunkirk and donned a costume, aiding the Allied forces as The Unknown. Among his enemies were X-19, a German female spy, and a Nazi commander who gained super-strength from cocaine. He battled Hitler himself and traveled to the concentration camp of Dachau to rescue a train of prisoners.