(Hulk fights Iron Man at first and this leads him to pull out his Hulkbuster armor)
NOTE: This would be like the BvS fight. The moment Marvel fans would be waiting for
IRON MAN V. HULK
(Unbeknownst to Tony, Bruce is The Hulk, but he turns back into Banner, and he learns about the Hulk transformation, and he's trying to find a cure for it so Tony helps Bruce cure The Hulk)
(They build the Gammatron to cure Banner until the leader attacks. Iron Man and Hulk fight Leader and we end with Tony Stark and Bruce Banner becoming science bros)
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What If The Hulk Was In Iron Man 2?
FanfictionThis question was the hardest one to come up with because Iron Man 2 is my second favorite in the trilogy
