adjective. Originating outside the known physical reality of the universe.

adjective. Coming from a dimension outside Einsteinian space-time.

"I’d recommend keeping the action of the story on Earth, rather than in extradimensional planes or hell or heaven or the Otherworld or whatever else you can think of."

extraterrestrial  

down.butthe  gambling-house  innovationand  intermodulation  interspatial  

tridimensional