It had been so long since he had felt the sensation of physical flesh and blood. In fact he had no idea just how long it had been. Time in Mephisto's Hell blurred as one torment seemed to melt into another in an endless cycle of pain and depravity. It came to the point where he could barely remember his own living past. Through all the torment he did remember a few things, his name, that he had been someone of importance, and an undying hatred of Captain America. These facts somehow kept his soul from completely breaking under the pain. It seemed his stubborn refusal to simply be just another broken soul caught Mephisto's attention, and the Hell-Lord had made him a singular offer. In exchange for a new, demonic life upon Earth once more, Zemo had to destroy the Avengers within a years time. If successful, Heinrich would be reborn as a human in the prime of his life. Failure would mean complete annihilation. In the end it was really no choice at all. Heinrich accepted, and using his newfound powers, returned to the Earthly plane. To Zemo's surprise more time had passed than he had imagined, a new group of striplings now made up the Avengers. As much as he desired vengeance on Captain America, he had to fulfill his contract with Mephisto first. That meant that these children had to die. Zemo was no fool and knew arrogance had led to his death and would not underestimate his opponents again.
His transformation into a demon had not just been physical, but also mental. Zemo learned that he now had a much greater affinity for dark magicks. While a man of science in life, Zemo would use any tool he had to to gain what he desired. Converting his body into raw, demonic essence, he moved through the night sky unseen by the humans below until he came to the headquarters of the Avengers. He moved towards it, his essence expanding and bonding with the building, an action completely unnoticeable to those on the street. When finished, all reality within the building was his to manipulate. Time to see just what these modern-day wunderkind could do.