Ive been wondering if the spirit world is going to be of more importace in the show. Ive been speculating that an enemey off some sort will come out of it. Aang now has two known enemys in there. (the face stealing spider thing and the owl that took his library back to spirit world.) I also speculated that defeating the Fire lord will not be end of show, but instead some greater enemy will arize??from the spirit world??and must be delt whith.
This is my theroy about spirit world what are yours.