Dr. Doom made a sacrifice of his former love, Valeria, to the Haazereth in order to gain augmented mystical powers to destroy the Fantastic Four.
Using power derived from the Haazereth, Doom contacted Valeria Richards. He also influenced Reed Richards' machine, altering its chosen destination and sending Franklin Richards into the Haazereth's realm of Hell.
The Haazareth conversed with Dr. Doom, about his bargain, and how Valeria made a good sacrifice. The Haazareth then got their hands on Franklin as he wanders aimlessly around the Hell Dimension, where they begin their torturing him.
The Haazareth observed the astral form of Dr. Strange and Reed Richards, who were in turn observing them through the Orb of Agamotto. Mr. Fantastic goaded Dr. Doom into refusing to admit he was indebted or inferior to anyone. The Haazareth then opened a portal through the Orb of Agamotto to Earth and pulled Dr. Doom through the portal to their dimension. The Human Torch, Invisible Woman, and Reed Richards took this opportunity to follow; they rescued Franklin, and Dr. Strange returned them to their dimension. Doom was left at the mercy of the Haazareth Three, though he did manage to severely scar Reed's face before his escape.
The Haazareth enjoyed tormenting Doom in their Hell, as one exclaimed "I haven't had this much fun since Dillinger." They demanded that Doom whimper for their master, Mephisto, but Doom refused. He was suddenly snatched from their grasp by Mr. Fantastic, who attempted to imprison Doom within a Mobius dimension.
Powers / Abilities
The Haazareth possess a large amount of strength between them, though their physical powers have never been portrayed. They possess the ability to transcend dimensional barriers through the use of arcane rituals, such as Pentagrams, or through artefacts, such as the Orb of Agamotto. The ability to control and manipulate minor demons, immunity and control of hellfire, and the ability to lend mystical powers to others, like any larger demonic deity could, such as Cyttorak, or Krakken.