This is a classic, a captivating and charming movie that remains in a class of its own. There's a spectacular array of creatures and a memorable plot with marvellous twists.
The fact is that all the species and characters come across as very real and believable - from the kindly and wise Mystics to the human Podlings to the awful and hideous Skeksis. The meal scene in the Skeksis castle is particularly vivid and memorable, although it's not for the squeamish! The visit to the lair of the witch Ogra is also quite humorous and spectacular, and I loved the little doggie, if it is a dog.
One of my favourite scenes is where the two Gelflings fall over a cliff and the girl spreads her wings, upon which the relieved boy exclaims: "But I don't have wings" to which the girl replies: "Of course not - you're a boy.". This is in the class of Lord of the Rings about 20 years before the latter was made, although it's probably not fair to compare the two.
Dark Crystal convinces with its world of believable puppets and impressive scenery, which adds a unique flavour to the film. I cannot fault this little gem on any aspect: the old myth is infused by new life here because of the amazing turns in the plot. The scenes are so colourful you cannot forget them, the characterization is of the highest calibre, and the cinematography is breathtaking.