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.
2006 LEGO Sets
In 2006, LEGO introduced several major themes while retiring others, marking a year of transition and innovation. One of the most notable additions was LEGO Batman, the company’s first full DC Comics collaboration, bringing Gotham’s heroes and villains into LEGO form. Another highly anticipated licensed theme was LEGO Avatar: The Last Airbender, based on the popular Nickelodeon series. However, despite its strong collector demand in later years, the theme was discontinued after just two sets, making them highly valuable today.