The One Below All's History
A malevolent entity that resides in the Below-Place - the deepest layer of Hell, the One Below All is an aspect of the One Above All that serves as the One Above All's dark counterpart. The One Below All is the source of the mutagenic third form of gamma energy, and is thereby capable of using gamma mutates as avatars to manifest. As the One Below All is the other face or dark side of the One Above All, the One Below All has existed before any version of the multiverse or even existence itself, and is purportedly the source of all other evil entities. As the dark alter-ego of The One Above All, The One Below All is a creature without a mind of its own, possessing only terrible desires, destroying all so that the One Above All can begin the cycle of creation anew. In spite of this purpose, the One Below All still harbors its own goals, comparable to a 'Hulk' itself. The One Below All genuinely does hate and fear the Mystery, and it's ultimate goal is to destroy everything in the Multiverse and to become the one remaining presence in it, leaving no stories and no life left to ever exist.
In spite of the One Below All's goals, it remained without a personality, incapable of acting beyond its role as a counterbalance. To do more, it required a host personality. During his research into the properties of gamma radiation, Brian Banner had a dream-vision of the One Below All, and sensed the creature looking for him. This experience prompted him to put all of his research to a halt. When Brian's son Bruce investigated gamma radiation on his own, he developed a powerful Gamma Bomb. The bomb's explosion opened the first Green Door, a metaphysical barrier into the Below-Place, and infused him with gamma radiation, turning him into the Hulk.
Years later, when Bruce killed Brian during the Chaos War, his soul was plunged into the Below-Place. The One Below All then joined with Brian and used his personality as its own, now beginning its plan to destroy Bruce and silence the multiverse forever. Through a Green Door, Brian possessed the gamma mutate Jailbait, causing her powers to go out of control. Her boyfriend, Hotshot, then was forced to tie her to a chair, due to her power growing out of control. He went to a church during Sunday services and held the congregation hostage in order to force the priest to perform last rites on Jailbait. He was ranting that Jailbait was possessed by the devil and that he saw a green door.
When Sasquatch was killed in a bar fight, Brian possessed him next and sent him on a feral rampage. The Hulk intervened and drained Walter's gamma power to stop him, which inadvertently passed Brian's possession on to him. The One Below All had Brian nudge the Hulk into travelling to the Los Diablos Military Base, the place where the gamma bomb had detonated. The Hulk saw through the One Below All's plan, but when Absorbing Man intercepted him, he drained the Hulk's gamma energy, transferring the possession to himself. After a brief battle with a now-emaciated Hulk, Gamma Flight arrived and Absorbing Man's possessed corpse used the distraction to flee towards the area where the original gamma bomb had been detonated, absorbing all the ambient gamma energy in the area. Successful, the One Below All opened a Green Door and plunged everybody on the scene into the Below-Place.
When the Hulk arrived at the Below-Place, he was split from Bruce Banner, whom Brian took captive with the intention to make him the new vessel for the One Below All and bring the Earth to the Below-Place. While making his way through the Below-Place, the Hulk was confronted by manifestations of Rick Jones and Thaddeus Ross, enraging him to the point where his Savage Hulk personality briefly emerged. When the sun rose, the One Below All was able to appear in an ominous cloud-like form and was soon ready to take control of Bruce's body.
The One Below All summoned a horde of demons whom the Hulk confronted along with the Rick Jones manifestation. In the meantime, Gamma Flight member Puck had managed to convince the Absorbing Man to set things right, and they approached Brian in the fountain of gamma energy where he was holding Bruce. The Absorbing Man soaked up the gamma energy and transferred it into the Hulk, allowing him to regain his strength just as he was being overwhelmed by the demons. Hulk then unleashed a thunderclap that dispersed the One Below All. With his power regained, the Hulk merged back with Bruce and closed the Green Door, sending everybody on the scene back to Earth.
