Star Wars: The Clone Wars (2008)

S6E10 The Lost One

During a Jedi assignment, a lightsaber once owned by the long-gone Master Sifo-Dyas is uncovered, leading Yoda, Obi-Wan Kenobi, and Anakin Skywalker to delve into his mysterious disappearance from a decade prior. This development alarms Darth Sidious, who instructs Darth Tyranus to eliminate any potential threats that could expose the Jedi to the hidden truths of the Sith's scheme.