Johann Kerr (Earth-1705)

General Johann Kerr is a former SS high-ranking officer, German nobleman and the founder of the Third Reich weapon and technology division of Hydra. Using the alias of Baron Kerr while leading the organization, Johann's goal was to create a gateway to Olympus, lair to the Greek gods, stories he always believed were reality. To further progress his goals, Johann allied himself with Russian defector scientist Josef Dragovich, and got in the way of the American superhero and World War II combatant Batman. During a fight against Batman in one of Baron Kerr's facilities, he fell in a pool of of his own invention, Axe, which, instead of killing him duo to his mask, severely deformed him by making his skin white, and hair and eyes green. Becoming crazier and more sadistic than before, Johann developed the identity of Joker, Batman's greatest enemy.

Responsible for the death of Batman's partner of the Howling Commandos, Robin, the Joker had a final confrontation with the dark knight at a plane in the Artic, where both combatants would be believed to have died for many years, Batman frozen, and Joker absorbed by Pandora's Box. Returning with the aid of Shinnok years later, Joker disguised himself as US senator Jack White, slowly corrupting the government and remaking it at Hydra's image, as well as brainwashing the though to be dead Robin, transforming him into his personal assassin, the Red Hood.