Invulnerability: Transformation into the Hulk provides Banner with Amazing protection against physical attacks, Incredible protection from energy attacks, and Monstrous resistance to cold, heat, fire, or disease.
Hyper-Leaping: The Hulk’s powerful leg muscles provide him with Shift-Y leaping ability, enabling him to cross 7 areas per round.
Adrenaline Surge: In times of great stress, the Hulk’s Fighting and Strength scores increase +1cs, and his attack damage increases to Unearthly.

Banner was present in the instrumentation bunker at the test site for the first underground trial detonation of the gamma bomb. Observing that a civilian had breached security and entered the restricted test area, Banner told his colleague Igor Starsky to delay the countdown while he tried to get the civilian to safety. Starsky, secretly a Soviet agent, did nothing. He was confident that Banner would die in the explosion, bringing the project to a halt. Reaching the civilian, a teenager named Rick Jones, Banner threw him into a protective trench. Before Banner could get himself to safety, the gamma-bomb detonated, and intense waves of radiation hit the surface. Banner was irradiated with highly-charged radioactive particles.

At first, Banner changed into the Hulk at sunset and reverted to human form at dawn. However, Banner’s body eventually acclimated itself to the changes, so that his transformations into the Hulk were triggered by the release of adrenaline when he became intensely ex cited, no matter what time of day or night it was. Usually, the Hulk possessed little of Banner’s memory or intelligence and was easily enraged. Hence, the Hulk was a menace continually hunted by military forces commanded by the implacable Thunderbolt Ross. For a short time, Banner managed—through radiation treatments—to maintain enough of his personality when he became the Hulk to control himself in that form, and he even became a founding member of the Avengers in this form. But once again the Hulk lost Banner’s intelligence and became a brutish menace. For a surprisingly long time, Banner managed to hide the fact that he was the Hulk, but his secret inevitably became public knowledge. For years Banner wandered the world as a fugitive, cursed by his recurring transformations into the bestial Hulk.

One place where the Hulk was welcome was the sub-atomic world ruled by a princess named Jarella. She saw something of the child-like gentleness of the Hulk, and the two were, after a sort, in love. But tragedy struck when Jarella returned with the Hulk to Earth and surrendered her life to protect a child.

Finally, scientist Leonard “Doc” Samson captured the Hulk and succeeded, through unknown means, in separating Banner’s psyche and atomic structure from the Hulk.

Hence Banner and the Hulk were now two separate beings. The Hulk, now free of the last vestiges of Banner’s moderating influence, escaped and became a greater menace than ever before. Banner became leader of a new government task force to capture the Hulk, called the new Hulkbusters. Banner also married Betty Ross, believing himself free from the curse of the Hulk.

Soon afterwards, Doc Samson discovered that Banner’s life force was tied to that of the Hulk, and that their continued separation threatened to kill both of them. A hurried experiment reunited the two in a new arrangement. The Hulk was now gray once more, and again manifested himself only at night. Moreover, he was possessed of all of Banner’s intelligence, although few of his specific memories, and none of Banner’s morality. He sought to keep himself alive and in control. Only during the full moon, when enough reflected sunlight hit the Earth to bring out some of Banner’s buried personality, would the Hulk have any kind feelings whatsoever.

The Hulk soon ran afoul of the Leader, who proceeded to trap the Hulk in an enclosed area with a detonating gamma-bomb. Coincidentally, the Hulk was simultaneously brought to Jarella’s world, narrowly escaping the effects of the gamma- bomb. The Hulk found himself embroiled in a religious war and agreed to assist one side of wizards in return for their preventing Banner from ever surfacing again.

Returned to Earth, the Hulk adopted the identity of “Joe Fixit,” and sought employment in Las Vegas as a leg-breaker. He joined with Michael Berengetti and the two share a tenuous kind of friendship. It appears that the Hulk has managed to convince most of his associates that his gray skin is some racial characteristic.

Recently, the Banner-suppressing spell has worn off. Again, the Hulk appears only at night, with Banner, now claiming to be Joe Fixit’s half brother, dominant during the day light.