For those that don't know, Henson Studios (makers of The Muppets) wanted to do a remake of Labyrinth and the contacted Dave McKean, who is the artist who did the covers for Neil Gaimans sandman comics, was contacted to direct it. Dave contacted Neil and the worked together, in Jim Henson's English Manor, to write the movie. What they ended up with was not a sequel, but something completely new.
the premise is the story of a girl who she and her family are in the circus. She runs away to join a normal life and ends up falling into a fantasy world where she must find the MirrorMask to win the peace and get back home. With lots of gratuitous trippy computer animations thrown in. (think of The Minds Eye series of videos, but with a coherent and indepth story line from beginnning to end.)