Yes, I was wondering if anyone could help me name a movie I once saw on cartoon network long ago. It was an anime about a boy who is taken to a far off land in his dreams. He meets a king and learns about a locked door far beneath the castle where a great evil is contained. After being convienced by a creature to open the gate because he is in some position of importance, the evil is released and attacks like a shadow swallowing up the king and the kingdom. I'm sorry I can't relate any more details, this is keeping me up at nights not knowing. Thanks in advanced for the help.

Sounds like Little Nemo: Adventures in Slumberland (1989) (http://www.imdb.com/title/tt0104740/)

Yes that's the one thanks, been plagueing me for the longest time.

You're welcome.