Glob World

Glob World is a place first mentioned by Jake in "The New Frontier." He explained that nothing will stop him "from transcending into Glob World" when he tried to accept his Croak Dream, and when his attempt to make it come true failed, he asked "am I in Glob World?," meaning that there must be a place where the people of Ooo go to when they die. But there is also the Land of the Dead, which is ruled by Death. This is because there are 50 different "dead worlds" in the Land of Ooo, like the 50th Dead World. It's confirmed by Pendleton Ward that in a future episode, "a four-headed deity called Grob Gob Glob Grod will rocket down to Ooo from Mars." They might be the ones who rule Glob World, and the place might be mentioned, explained, or even visited in that episode.