Doctor Thaddeus Bodog Sivana is a fictional comic book supervillain. Created by Bill Parker and C. C. Beck, he first appeared opposite superhero Captain Marvel in Whiz Comics #2 (February 1940) by Fawcett Comics. Sivana was soon established as Captain Marvel's archenemy and most frequent foe, a role that he continues to hold to this day in his appearances in DC Comics, who eventually acquired the rights to those characters from Fawcett. In 2009, Doctor Sivana was ranked as IGN's 82nd Greatest Comic Book Villain of All Time.
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