The Lost One " The Lost One " is the tenth episode of the . It premiered on the German TV network on March 1 , 2014 and was released in the US and Canada via on March 7 , 2014 . Official description . " " A Jedi mission finds a lightsaber belonging to the long - dead Master Sifo - Dyas , prompting Yoda , Obi - Wan Kenobi and Anakin Skywalker to begin an investigation into his decade - old disappearance . This sparks Darth Sidious to order Darth Tyranus to clean up any loose ends that may lead the Jedi to discover the truth of the Sith conspiracy . " " Plot summary . On the moon of Oba Diah , Plo Koon examines a signal from a ship of a Jedi that was long presumed lost . Through a fierce sandstorm , Plo finds the spaceship and discovers the lightsaber of Sifo - Dyas . Plo communicates his discovery to the Jedi High Council where Yoda confirms the lightsaber to be that of Sifo - Dyas . Mace Windu remarks that Sifo - Dyas was on the council before the Invasion of Naboo , but , because he foresaw a Great Conflict and that the Republic needed to raise an army , his ideas was considered " too extreme " . Obi - Wan Kenobi reminds them that , during his chase for Jango Fett , he learned that it was Sifo - Dyas who ordered the creation of the clone trooper s on Kamino . Yoda feels that more is going on here and wants to find the truth . Jocasta Nu says that Sifo - Dyas had died on Felucia during a diplomatic mission between mutual tribes of Jungle Felucians . The end of the mission was classified by the office of the Supreme Chancellor . While Kenobi and Anakin Skywalker travel to Felucia , Yoda questions Chancellor Palpatine about the file , who claims he has never heard of the Jedi Master and says that the file was handled by his predecessor Finis Valorum , since he was still a Senator at the time . Meanwhile , Darth Sidious chastises Dooku to tie up this " loose end . " Before heading to Valorum , Yoda is told that the Felucians cremated Sifo - Dyas ' body and that another Jedi was with him . Valorum explains that Sifo - Dyas was sent to negotiate with the Pyke s regarding an underground war . However , the negotiations were postponed as Yoda ordered Syfo - Dias to intervene in a conflict on Felucia . When asked about the other Jedi , Valorum says only his personal aid , Silman , accompanied Sifo - Dyas . Anakin and Obi - Wan travel to Oba Diah to confront the Pyke Syndicate regarding the situation . Lom Pyke reveals that a man named Tyranus had paid them to shoot down the ship and that for insurance , Silman was kept locked away by the Pykes . Silman , who has been imprisoned for up for 10 years , has lost his mind . He says the Pykes are not to be trusted , but is suddenly killed by Dooku before he can reveal who really killed the Jedi Master . Anakin and Obi - Wan engage Dooku in combat where Lom reveals that the man called Tyranus is really Count Dooku . Dooku kills Lom before managing to escape . On Coruscant , the Council deduces that Dooku was responsible for the creation of the clone army . Questioning why their enemy created them an army for them , Yoda explains that this must really be the work of the Dark Lord of the Sith and that all they could do is " play his game " .