Madame Doom

Madame Doom was a European adventuress and a spy who sold her services to the highest bidder, even if that highest bidder happens to be one of the Axis powers. She is a recurring opponent of Black X, an American secret agent. During their first few encounters, the two were attracted to each other. Madame Doom tried to convert him to her side while Black X tried to convert her to his. This culminated with Black X resigning from the service to be with Madame Doom. For some reason, Madame Doom decided that this meant that it meant that he would help her with her latest plot assassinate Allied ambassadors. When the appalled Black X rejected her, she blew herself up.

Somehow, Madame Doom managed to survive that, reappearing in Smash Comics #20. From that point on, the romantic tension between her and Black X vanished and they became ordinary antagonists.

Golden Age Appearances

 * Smash Comics #4,12,14,20,28,31,41