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Golden Age Origin
Baron Eric von Emmelman was a German ace shot down during World War One. He landed in a Polish swamp and during 20 odd years he merged with the "dreary vegetation" to become a vampiric humanoid. However, he was a good guy, though, and ended up flying a fighter against the Germans and going to Japan and China to fight against the Japanese. He then made his way to the States to fight crime.

Golden Age Appearances

 * Airboy Comics #vol. 3 #9 - vol. 10 #4
 * Air Fighters #3