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.
The LEGO Star Wars theme which was licensed and released in 1999 is based on concepts from the Star Wars franchise of films, comic books, video games, cartoon series, and other sources. The theme currently covers all main films, the anthology films, animated movie and TV series as well as the extended universe.