The Ultimate Collector's Series, or UCS, is a LEGO subtheme of Star Wars introduced in 2000 and was meant to be more detailed and aimed at older builders. These Ultimate Collector's Series sets tend to be larger, and more expensive than typical sets.
2000 LEGO Sets
The turn of the millennium was an important year for LEGO. Not only did LEGO produce some investible sets for 2000, we saw some transition in the company. First, set designer and the inventor of the minifigure, Jens Nygaard Knudsen, retired from The LEGO Group. Second, The British Association of Toy Retailers name the LEGO brick "Toy of the Century". With 2000 LEGO released just a couple of new themes including TECHNIC Roboriders and Race. The Rock Raiders, Nijna and the Slizer/Throwbots themes were discontinued.