Before the expedition to Vassek's third moon, and some time earlier, Jedi Master Neebo embarked on a mission to safeguard the refugees on the moons of Sanjin. Neebo was thought to be lost. Nevertheless, General Grievous of the Confederacy of Independent Systems possessed Neebo's lightsaber.
The episode guide for "Lair of Grievous," the tenth episode from the first season of The Clone Wars, initially broadcast on December 12, 2008, was the first instance where the mission to the Sanjin moons was brought up.