Disclaimer: I don't own Dragon Ball, Dragon Ball Z, Dragon Ball GT or Adventure Time with Finn & Jake. They're owned by their receptive creators and licensors AKA anyone who's putting them on TV.
A/N: This idea was somehow sparked while talking with my friend about Buu being in the Candy Kingdom and trying to turn the people of the Candy Kingdom into candy. How that conversation started is a mystery even to me.
A/N: Secondly this was going to be one huge chapter but it was too long so I divided it into ten short chapters.
Origins of Ooo: This takes place on Dragon Ball Z Earth 1,000 years after the end of DBZ and ignores everything about GT including Pan and Uub. Also I started writing this after the Lich episode so any future occurrences on Adventure Time won't be considered, but the events mentioned take place before the series.
The origins of Ooo are shrouded in mystery; some know that nuclear fallout was involved, but that is only a small part of the story. A common question regarding the origins of Ooo, is what Ooo was like before the bombs dropped, was it even Earth back then? The answer is yes, but not the earth you know of, it was a highly advanced planet; but somehow also had dinosaurs and demons. Most of the population was human, a large portion of the populous was talking animals who wore clothing, and a tiny margin was aliens. Though the aliens were more human then alien, after generations of marrying and breeding with humans. This world once possessed seven mystical balls that when brought together granted one wish. They lost them because a scientist obtained one and tried to explain its power; the resulting explosion from the ball traveled through its companions, blowing up four towns and chunks of different forests. After that, the heroes of earth travelled to another planet to use their mystical balls, so they could repair their landscape and wish back those who had died; they felt it was best not to have any on their planet where they might be used for evil. The heroes of Earth believed they could merely travel to the other planet whenever a wish was needed to be made. This worked for many years, and the Earth that would become Ooo continued to spin, for awhile.