The LEGO Master Builder Series represents a specific category within the broader range of LEGO Star Wars sets. It shares a close relationship with the Ultimate Collector's Series as a related subtheme. Its introduction occurred in 2018 with the debut of 75222 Betrayal at Cloud City. In contrast to the Ultimate Collector's Series, which focuses primarily on aesthetic presentation, the Master Builder Series, although still employing intricate construction techniques, places a greater emphasis on interactive play features.