The cartoon was about a boy who was like in the real world (sorta like peter pan's normal world to neverland) then was picked up by some sort of magician or king then after a while of flying in their spaceship thing they were attacked by a darkness monster or a big black cloud. Later on the king was attacked by the same thing in the dinner party. In the few scenes the kid fights the darkness with the king's scepter and destroys it. I think he returns home shortly after..
If someone knows this please tell
It's been bothering me for sometime now..

Could be Little Nemo: Adventures in Slumberland.

Little Nemo: Adventures in Slumberland (http://www.imdb.com/title/tt0104740/)