Aaron Carpenter (Earth-616) VS Aaron Stack (Earth-9200)

Dr. Aaron Carpenter was the world's greatest living brain surgeon. He knew Bruce Banner from high school, whom he saw as an "insufferable geek." After Bruce Banner was shot in the head, Carpenter was contacted by the Ancient Order of the Shield,[1] disguised as S.H.I.E.L.D., the ones who secretly had Banner shot, and was brought in to operate on him. During the surgery, Carpenter was ordered to place a device capable of controlling the Hulk's transformations in Banner's brain. Aaron hesitated, and thought of killing Banner to prevent the agency from controlling Hulk, in order to save lives. However, Banner was awakened by the anesthetist, whose life had been saved by the Hulk decades ago, triggering his transformation into the Hulk. The agency released a gas in the operating room in order to eliminate the witnesses of their actions, but the Hulk managed to break a wall and allow the gas to scatter, saving the life of Carpenter and the other participants of the surgery.

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Stack's history is presumably similar to his Earth-616 counterpart's. After nuclear war and biological attacks from the Black Scythe wiped out much of humanity and devastated the world, Stack lived with the descendants of the employees of the White House who survived the onslaught in a hidden bunker beneath the structure.[1] The community didn't have leadership; instead, Stack acted as the community's adjudicator. One day, he and the survivors stumbled upon the Hulk after he followed one of the survivors into a passage that led into the bunker. Stack greeted Hulk but told him that his large size meant that he would greatly lessen the time their supplies lasted. Stack then showed Hulk a city called Dystopia, which was built upon the ruins of New York City by someone called Maestro. Curious about Dystopia, Hulk left the bunker and ventured toward the city. Years later, Hulk became the new Maestro of Dystopia and began conquering neighboring territories. When Stack and his community became the Maestro's next target, Stack evacuated everyone out of the bunker and distracted Maestro with a duplicate of himself while he and the community got away in a plane. The duplicate then detonated a bomb, destroying the bunker and leaving Maestro humiliated.

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