Dr. Sivana

Dr. Thaddeus Bodog Sivana is a mad scientist extraordinaire, especially in the fields of robotics, cloning, and dimensional portals. Scientist, inventor, criminal mastermind.... and a former Mayor of Fawcett City. A long time enemy of Captain Marvel, Sivana has had numerous dealings with various supervillain groups and individuals, from Luthor to Fearsome Five to the Secret Society of Supervillains. He's even had 'off the book' deals with different countries, including the United States, in return for his freedom - including coming up with methods of defending the planet against threats like Darkseid.