This season contained only 13 episodes, bringing the official count to 121. This season is critical because it contains the "Order 66 Arc" (including the biologically devastating "Fives" conspiracy) and the "Yoda’s Journey" arc, which directly connects The Clone Wars to Revenge of the Sith . For four years, 121 was the accepted number—a tragic, unfinished symphony.

While it is a separate theatrical movie, it serves as a "pilot" for the series. It introduces Ahsoka Tano and sets the stage for Season 1. In many official viewing orders, this movie is treated as the first chronological entry in the saga, effectively acting as episodes 0 through 3 (as it comprises three TV-length episodes stitched together).