K-4. Captain K-4 is the leader of the Sky-Devils. K-4 is a "flying spy and soldier of fortune–the youngest flying lieutenant in the first World War with eleven victories to his credit at the close–triple that with the loyalists in the Spanish rebellion, and dozens more in the China-Japan conflict." He has no superpowers but is an ace in his Grumman and a dreaded foe of the Germans.

First Appearance: Daring Mystery Comics #2 (Marvel), Feb 1940. 3 appearances, 1940. Created by ?





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