Also, one of the most epic comic book fights of all time was World War Hulk, stemming from a story line where Earth just considers Hulk's instability too much if a threat and shoots him into space, and he returns to dominate essentially every earth hero in Marvel history.
Marvel would have to world-build for multiple films before that could be possible, but it does underscore that there is a genius plot waiting to be written for film where the Hulk goes off and becomes humanity's worst nightmare.
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