It has been at least a little less than a decade since the finale of the show Adventure Time, and a bit before Fiona & Cake started.

While the main storyline and its sideplots had concluded, there are other stories to be told, and other types of worlds, areas, and dimensions to be known by the masses; Or, well, those who are courageous enough to want to explore if they think hard enough on it.

While dimensions such as Lumpy Space and the Nightosphere, and areas of Ooo such as the Candy Kingdom and Fire Kingdom are already known, who knows? The Land of Ooo isn't a "normal" space of land after all, so anything can just happen unwarranted if given the chance!