Cloak of Darkness " Cloak of Darkness " is the ninth episode in of the " " television series . It is the ninth episode of the series overall . Official description . " Ahsoka and Jedi Master Luminara escort captured Viceroy Nute Gunray to trial , unaware that Count Dooku has dispatched his deadly apprentice assassin Asajj Ventress to free the prisoner and eliminate the Jedi . " Plot summary . Viceroy Gunray has been transferred to the " Tranquility " under Luminara Unduli where he was to be carefully taken to Coruscant to face trial for war crimes . Ahsoka and a number of Senate Commando es under Captain Argyus had also been transferred . Ahsoka does not think that all the extra security is necessary , but Master Unduli assures her that the Neimoidian is more dangerous than he looks . Unduli suggests that his allies could be conspiring against them . Elsewhere , Darth Sidious informs Count Dooku that Gunray poses a significant danger to them and their plans if he is interrogated . Dooku tells him that he has already put a plan into motion . Dooku is sending his assassin and best agent Asajj Ventress , despite her previous failures , to either rescue or silence Gunray . Once Sidious is gone , Dooku impresses on Ventress the fact that failure is not an option . Back on the " Tranquility " , Unduli and Ahsoka interrogate the Viceroy . When they are getting nowhere and the Viceroy refuses to answer their questions , Ahsoka threatens him only to be chastised by Unduli . Nonetheless , the threats coerce Gunray to start talking . Unfortunately for the two Jedi , a swarm of Vulture Droids escorting three Separatist boarding ships attack the " Tranquility " . Super battle droids assault the Cruiser and hold off the clones , allowing Ventress to slip inside undetected . Commander Gree , a squad of Green Company , and Unduli goes off to deal with the droid s , leaving Ahsoka to guard Gunray . Ventress infiltrates the engine room and plants a number of thermal charges on the cruiser ' s generators before going to the brig . The Super Battle Droids are destroyed , leaving Ventress the last enemy on board . She duels Ahsoka for a short while before ironically locking her in Gunray ' s cell . Luckily , Unduli ' s timely arrival prevents Ventress from rescuing Gunray . Unfortunately , the assassin detonates the charges , rocking the ship before fleeing down the elevator shaft . Unduli goes after Ventress , confident that she can defeat the assassin , leaving Ahsoka again , in spite of the Padawan ' s insistence that Ventress is too dangerous for any one Jedi to combat . Argyus advises Ahsoka to do what she thinks is right . In the generator room , Ventress and Unduli duel : Unduli is swiftly outmatched as Ventress , outraged because Unduli is taunting her fighting style as a sloppy and amateurish imitation of Dooku ' s , overpowers Unduli and traps her under a number of collapsed pipes . Ahsoka makes a timely save only for Ventress to escape again . Back in the brig , Argyus betrays his fellow commandos and frees Gunray , revealing that he was bribed by Dooku to help rescue the viceroy . Commander Gree manages to overpower him after a brief fight . Tree asks Argyus why he ' s doing this . Argyus tells him he doesn ' t expect a clone like him to understand but he wanted a life filled with more than empty servitude . A disgusted Gree snarls " And for that you ' d betray the Republic " . Argyus states that it ' s like he told Ahsoka : " Sometimes being a good solider means doing what you think is right " and dives for his blaster . Gree intercepts him and knocks him out . Gree snarls " You and I disagree on what makes a good solider " and prepares to kill the turncoat only to be knocked out by Gunray . They make their escape on the docked Republic ship in the lower hangar , joined by Ventress , who uses an escape pod . Argyus gloats that he will take most of the glory in his report to Count Dooku , but Ventress impaled him , killing the turncoat . Later , Unduli and Ahsoka report to Yoda and Anakin Skywalker about the loss . They are told that they may be able to track the stolen ship . Ahsoka leaves to join Skywalker with Kit Fisto ' s fleet , but not before receiving an apology from Unduli for not having listened to her monition about Ventress .