Using the power of the Black Makluan Ring, Doctor Doom summons Yogthulu to his dimension. Doom offers him a deal. He wants Yogthulu to bring his family back to life in exchange for three pure souls that he has captured (Iron Man, Mandarin, and Howard Stark). Yogthulu has trapped them in his dimension and they try to fight him. But as he figures out that Mandarin is not a pure soul, Yogthulu declares his deal with Doom forfeit. Doom is angered by this and threatens to tear his realm apart, When the three get back to Earth, they thwart Doom and trap him in Yogthulu's dimension.
Yogthulu is a powerful demon with powers that seem magical. He is immortal, can teleport, and even bring the dead back to life. He can also look into the soul of another person and see its purity or impurity.
Yogthulu can also shoot lightning out of his mouth and eyes.