Duel on the Titavian IV The Duel on the " Titavian IV " happened when Jedi Master Obi - Wan Kenobi received a Jedi distress call from the " Titavian IV " , an exploration ship from the Intergalactic Zoological Society . Kenobi found Quinlan Vos on the run from a group of Morp droid s , which had been unleashed by Dark Jedi Asajj Ventress and Tol Skorr . The two Dark Acolyte s had been sent by Count Dooku to hunt down Vos after he failed to obtain a Scientific Instrument Package containing Trihexalophine1138 from Aayla Secura . The assassination attempt was also part of Dooku ' s plan to place Vos back in the Order as a spy . Vos went along with it seeking to further gain Dooku ' s trust and learn the identity of his Master , the elusive " Second Sith " . Prelude . Dooku conceived of a plan to infiltrate the Jedi Order , dispatching Quinlan Vos to return to them , pretending to re - defect back to the Republic . For added credibility , he sent Asajj Ventress and Tol Skorr to retrieve him , intending them to fail but keeping them in the dark about the nature of the mission . Vos fled to the deserted science vessel , " Titavian IV " , and sent a Jedi distress signal . He repaired his ship and was scrounging the " Titavian " for supplies when Ventress and Skorr found him . The call for aid was answered by Obi - Wan Kenobi , who boarded the " Titavian " and found Vos being harassed by Ventress ' attack droids . Kenobi decided to aid his former friend , and helped Vos escape the droids . When Kenobi pressed him about his activities , Vos claimed that he was still a Republic agent in the enemy camp . As Kenobi and Vos searched through the " Titavian " they were again set upon by Ventress ' droids , who herded them to Ventress and Skorr themselves . The mission . While Skorr attacked Vos , Ventress fixated on Kenobi . Skorr managed to subdue Vos , though Kenobi evaded Ventress and released a Rancor from its onboard holding pen , effectively siccing it on Ventress and Skorr . While they broke off to deal with it , Kenobi rescued Vos . Vos was sent out it Kenobi ' s one - man starfighter to retrieve his own ship , the " Skorp - Ion " , while Kenobi delayed Ventress and Skorr . However , Kenobi was forced to contend with the Rancor as well , as Ventress managed to dominate it . Kenobi made it to the hangar , where he was attacked by Skorr aboard his own ship . Leaping atop Ventress Rancor mount , Kenobi kicked her off and killed the beast before retreating to an overhead catwalk . Ventress pursued him and attacked , but was forced to break off when Skorr fired on the platform . Unfortunately , Skorr was himself shot down by Vos aboard the " Skorp - Ion " , allowing Kenobi and Vos to flee . However , Ventress had placed a tracer aboard Vos ' ship , allowing her to track Vos . Despite this , the retrieval was a failure , and adding insult to injury , Ventress and Skorr were in turn retrieved by Grievous . Aftermath . Kenobi brought Vos before Master Saesee Tiin just prior to the Battle of Rendili , and Vos was disarmed and incarcerated . However , during the battle , power surges aboard the Republic flagship from the battle damage allowed Vos to escape and retrieve his weapons . Taking a Jedi starfighter , Vos joined the Republic forces . Vos ' aid proved instrumental to the Republic victory .