Dimension-Hopping Civilizations

This category is for species who have gained the means, technological, magical or biological to allow them to travel between Dimensions, parallel worlds, and other universes.

(Please note that this category is for species who can willingly send items/beings between dimensions/universes, not species who have been misplaced via holes in the space-time continuum, accidents involving FTL Drives failing and leaving people stranded in other dimensions, magic spells gone wrong, teleporter malfunctions, and so on and so forth, this also doesn't apply to species who use external dimensions for a mode of FTL travel (eg: Hyperspace Travel, Slipstream Drive, Infinite Improbability Drive, etc and etc)