The Demon World
The Demon world is first announced in the beginning of Buu Saga. The Demon world is like the opposite of the World of Goku and the others. The King of the Demon world happens to be Dabura. He is the most powerful in the Demen World. But Babadi took him under his control. Its like two sides of a coin as Shin says. One side is the world of dbz as we know. And the other is the Demon world.
