Recenetly I have been trying to track down all of my favorite childhood movies. When I was younger I remember watching an animated movie about a little boy. The only thing I remember is at the very end he is in a castle and it is destroyed by a sludge like substance. I thought the title was Secret of Nimh but that is something different. I know the title has to be along those lines. It's animated so I don't know the actors and I don't even know the title so I have o idea how to find it.