ARC Troopers " ARC Troopers " is the second episode of the ' . It aired on September 17 , 2010 as one half of the season ' s hour - long premiere . It serves as a sequel to the episode " Rookies , " though it does not immediately follow the episode . Official description . " The Republic learns of an impending Separatist attack on Kamino , and Anakin and Obi - Wan hurry to the planet . After the Republic repulses the Separatists ' diversionary assault , the real attack begins . Asajj Ventress , General Grievous and an army of droids rise out of the ocean s , bent on destroying Kamino ' s clone production facilities . Rex , Cody , Fives , and Echo lead the clones in a desperate defense of their home planet . " Plot summary . Forewarned by the destruction of Rishi Station and an intercepted transmission between Asajj Ventress and General Grievous , Anakin Skywalker and Obi - Wan Kenobi travel to Kamino to warn Shaak Ti and Lama Su of an upcoming Separatist attack , with clone troopers Captain Rex , Commander Cody , Broadside , Echo , and Fives of the 501st Legion in their company . While Echo and Fives are walking down a hallway full of young clone cadets , remembering their own time as cadets , they run into 99 . 99 welcomes them back , but is saddened to hear that Hevy , who gave him his medal , has not made it . Shortly , a Separatist fleet arrives and a space battle ensues . Anakin leads the Republic space forces against the attackers , scoring several serious hits against the enemy - or so it seems . Suspicious , Obi - Wan travels underwater , where he discovers that the pieces of debris falling into the Kaminoan ocean are actually components for attack craft being assembled by aqua droid s . The droids discover and attack him , and he barely manages to get away astride an aiwha . The finished attack craft begin to assault Tipoca City , breaking through the walls and depositing their droid load inside , along with Grievous and Ventress . After a bit of bickering about which one of them is superior to the other , the two leaders proceed to attack two key targets : Grievous is to attack the barracks to kill all the clones he can find there , while Ventress heads for the main DNA storage to secure the prime DNA sample of the clones ' template , Jango Fett . However , Obi - Wan has managed to get back and recall Anakin to the city ; while Obi - Wan faces off against Grievous , Anakin engages Ventress in combat . Grievous escapes when a Trident unit crushes the platform they are on ; Obi - Wan seemingly falls to his death , but is saved again by the aiwha . With the aid of a clone trooper platoon , Anakin secures the DNA sample from Ventress , but she manages to hop onto Grievous ' escape pod and get away . Meanwhile , Fives and Echo destroy attacking Aqua Droids from a sniping position , where they are soon joined by 99 bringing them ammunition and a group of lost youngsters . They retreat into the barracks , where Cody and Rex also appear . Although their chances do not look good , Fives and Echo succeed in raising the morale of the young cadets , and 99 shows them the way to a nearby armory , where they re - equip themselves . A platoon of battle droids soon attack the barracks , and by having the cadets strike from ambush , the troopers succeed in destroying all of their attackers , but 99 is killed as he tries to get more ammunition for his brothers . After the battle , both Echo and Fives are promoted to ARC troopers by Captain Rex for their initiative and bravery . Behind the scenes . The scene where Asajj Ventress kills Commander Colt originally had Ventress kissing the ARC trooper just after she impaled him on her lightsaber . The scene was cut when Cartoon Network insisted on taking it out at Celebration V . However , the scene was still part of a dataclip summary of " ARC Troopers " on Cartoon Network ' s own site . In later reruns of this episode , Colt is not shown being impaled at all ; rather , it is merely implied . The DVD , Blu - ray , and also the Netflix release of the episode shows both Colt ' s death and the kiss . An inconsistency in the episode was that the bridge of Grievous ' command ship , which was a Separatist dreadnaught , was depicted in scenes where it was shown as resembling the bridge of a " Munificent " - class star frigate .