Gamma bombs dropped on WWII Japan, spawned hundreds of hulk-creatures. This group of hulks or the Oni retaliated against the United States and conquered it in a month. For forty years, they had kept the US. They had even kept the US citizens as second class citizens. That changed when gradually pockets of superheroes started to pop up like the X-Men and the Fantastic Four. The greatest revolutionary of all is the Hulk who is like an Oni in strength but with great intellect.