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The CartoonNetwork World was infected by a planet that has been drawing close to it and wants to make their world apart of Lord Fuse's. So Lord Fuse invades the world with his monsters and creates fusion monsters of the people who live there. But the citizens fight back, which is where you come in. Eventually, you get the opprotunity to defeat Fuse on your own, before the world ends up like it does in the Future where you start at.