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.
2010 LEGO Sets
In 2010, LEGO laid the foundation for one of its most successful collector-driven series with the release of Collectible Minifigures Series 1 and 2. This marked the beginning of a highly sought-after investment category, introducing blind-bagged minifigures with unique characters, accessories, and themes that quickly became a hit among collectors.