Cant remember old children's cartoon movie
OK I don't remember much of this movie at all it might have been a disney film but I know it was hand drawn like the black cauldron and I know it was sort of on the fantasy side but this kid was like in a castle and the king I think said whatever you do don't open this door and of coarse he does just to take a peek but it was like a huge wooden door full of spiderwebs and stuff and when he opens it all this black slime/liquid/oozy stuff pours out and that's alll I remember. Please help this is really killing me I'm 17 and I remember watching it as a kid so prbably 10-12 years ago I don't remember when it came out probably in the late 80's early 90's
