| Edward Cobert was a government scientist heading a program to develop new super humans who would control or eliminate existing super humans. Cobert subjected himself to his own experiments and became a destructive, dim-witted giant dubbed Leviathan. He was used as a pawn by the subversive organization, the Secret Empire, who wanted to trigger a nuclear war between the United States and the Soviet Union. The superhuman adventurers called the Defenders defeated Leviathan and the Empire. Later, Cobert became a pawn of the evil Mad Thinker, who gave Cobert the new costumed guise of Gargantua. |
