Adolf Hitler, had many brushes with the esoteric during his career. He may have been manipulated by Heinrich Krowler and the Chapel of Dresden. Accounts vary, but at some point rogue geneticist Arnim Zola established a process by which a person could project their mind onto a cloned body. He presented this process to Adolf Hitler. Apparently in his new cloned body, Hitler established the haven for criminals called Erewhon in South America as well as staging a coup in the South American nation of San Gusto.
The Hate-Monger (also called “Nazi X”) first appeared in San Gusto in South America, and came to the attention of authorities when he took over with the use of storm troopers, hoping to upset the balance of power in South America. The Fantastic Four saw a hate rally in New York City and the Thing tried to wreck it, but the Fantastic Four were caught off guard by Hate-Monger’s weapon — the Hate-Ray — which instilled hate for others causing them to fight each other. As a result, the team disbanded and went their separate ways.
Nick Fury, at the time a CIA agent, then managed to trick Mister Fantastic into traveling to San Gusto with him to fight the Hate-Monger, knowing the other members would follow. The Hate-Monger saw the plane leaving and used a device that travelled underground by the use of flames that carved out tunnels to quickly get to South America. Fury and Reed fought off some of the rebels, and infiltrated the Hate-Monger’s headquarters after Reed found a device sending out beams and found the source of the disturbance. However, Reed was paralyzed with nerve gas and captured by the Hate-Monger, who revealed he had been bouncing his ray off the Moon, which had been causing abnormal effects on the tides.
Fury managed to cure Mister Fantastic after getting the cure for the ray and gas from the Hate-Monger at gunpoint, though the Hate-Monger stopped them capturing him by lowering bulletproof glass. Mister Fantastic then gave the antidote to the other members, and together they got to the base to help Nick Fury. In the final confrontation, the Hate-Monger was shot and killed by some of his own storm-troopers when an H-Ray beam struck some soldiers by mistake due to the Invisible Girl. When Mr. Fantastic removed the Hate-Monger’s mask, it was revealed that Hate-Monger was Adolf Hitler — who apparently survived World War II, though it is claimed it may be one of his doubles.
It was discovered later that the scientist Arnim Zola had perfected a means of transferring the mind to the body of a clone, thereby allowing Hitler to live on in the event of the death of his body. The Hate-Monger suffered a succession of defeats by Nick Fury, who wrecked the Hate-Monger’s attempt to blackmail the nations of Earth with the “hate-ray” from an orbiting space station. The Hate-Monger was killed again.