Dr. Thaddeus Bodog Sivana, Sr. - "The World's Wickedest Scientist" - debuted in "Whiz Comics" #2 alongside Billy Batson and Captain Marvel, quickly becoming his main archenemy and most frequently recurring villain. A mad scientist who fights the Marvel Family using his genius intellect and inventions, the Golden Age Sivana had been a humanitarian scientist who bitterly fled 20th-century Europe after his inventions were ridiculed by the scientific society. Living on Venus with his four children, he became a mad scientist, bent on taking over the universe.