Carnage of Krell " Carnage of Krell " is the tenth episode of the . It officially aired on November 18 , 2011 . Official description . " " With two of his men facing execution for disobeying orders , Captain Rex must confront his overly aggressive commander , General Krell . Risking charges of mutiny , Rex must make a dark choice as the true face of the enemy emerges . " " Synopsis . Captain Rex meets Krell in his command tower and asks him to reconsider Fives and Jesse ' s court martial , but Krell refuses to back down on the grounds that the two " traitors ' " insubordination will inspire others to rebel against his command as well . Again demonstrating his high disregard for the troopers , Krell claims that they don ' t have any more time to waste , and orders Rex to organize an immediate execution . Rex descends to the brig to retrieve Fives and Jesse , and informs them of their impending fate ; an announcement they do not take lightly . Rex feels helpless to resist , though he assures the prisoners that he will not let Krell ' s injustice go unpunished . In apparent acceptance , Fives tells Rex that they knew that they ' d be punished for their actions ; an admission which Jesse does not appreciate . Fives and Jesse are escorted out and placed in front of a firing squad led by Dogma , who is the only one who shows no discomfort with the idea of executing fellow clones . As the men take aim , Fives suddenly appeals to his brothers , telling them that they are not unthinking droids but sentient and intelligent beings . Fives argues that the clones are men , who not only follow orders and serve loyally , but who also must be trusted to make their own decisions when their orders are clearly wrong . Disregarding Fives ' appeal , Dogma orders the execution squad to fire , but the clones intentionally miss . Despite Dogma ' s energetic appeals to carry out the order , he finds no support among the firing squad , or with Rex , who orders Fives and Jesse to be released . After the failed execution , General Krell orders Rex and Dogma to the tower , addressing the former as making a big mistake by crossing him as a mere clone . Rex retorts " It ' s Captain , sir . " and Krell growls angrily at him . Before Rex and Krell can come to blows over the matter , the tower receives a transmission from a clone scout , informing them that the Umbaran s are preparing another offensive , possibly with the aid of clone armor and weapons captured from a platoon . Krell decides on a pre - emptive strike . The troops move out , but soon run into a firefight and begin targeting what they believe to be the enemy in disguise . Rex ventures across the enemy lines , investigating the corpse of one of the supposedly " disguised " Umbarans . To his unutterable horror , the soldier turns out to be a clone trooper from the 212th Attack Battalion . Realizing they have been deceived , Rex breaks into a run across the battlefield , frantically ordering his men to remove their helmets and reveal their true identity to their misled comrades , nearly getting shot by one before the poor soul realises he ' s been tricked . The fighting stops as soon as the deception is revealed , but both sides have already taken heavy casualties , among them the 212th platoon leader , Waxer . Waxer informs Rex that General Krell had given the same orders to his men as he did to Rex , claiming that the enemy was wearing clone armor , before he dies from his wounds . Shaken and stunned , the troopers of the 501st Legion and the 212th rally under Rex . Despite the potentially treason ous nature of the act , Rex orders the volunteers to apprehend and arrest Krell for treachery against the Republic . They return to the airbase , release Jesse and Fives , and confront Krell in the command tower . Unperturbed , Krell flippantly admits to ordering the clones against each other before he attacks , cutting down several of the clones in an intense close - quarters fight before he smashes through the tower windows and flees towards the jungle , cutting down anyone who gets in his way with his dual doublesabers . As Rex ' s men begin to give pursuit , Dogma , who had deserted the group beforehand , intercepts them , holding them at gunpoint , and denouncing them as traitors . In a tense standoff , Rex argues that despite their engineering , the clones are not droids , and that they must make their own decisions . After a final warning from Tup , Dogma is arrested . Rex orders Dogma to be imprisoned before leading his men in pursuit of General Krell . While the clones search the jungles , Krell ambushes his pursuers , followed by an attack on Rex ' s squad . Tup is thrown aside during the carnage and lands near a native vixus . He has Rex lure the traitorous Jedi to the carnivorous plant , resulting in Krell being injured by the monster and stunned by Tup . In the brig , Krell admits to Rex ' s questioning that he has in fact turned traitor , having foreseen the rise of a new order in the galaxy , and seeking to gain from it , abandoned his Jedi principles in favor of a self - serving ideology . He also reveals his intention of sabotaging the Republic war effort by giving away vital information to the Umbarans , with the ultimate aim of being recognized by Count Dooku and becoming his new apprentice . At this point , Dogma turns against Krell and denounces him as a traitor . An unrepentant Krell responds that he merely took advantage of his blind loyalty . After leaving the prison , Rex and his squad are informed by Appo that Krell has sabotaged the airbase ' s communications and had been feeding them misinformation : Obi - Wan Kenobi ' s men have long since captured the capital , but the surviving Umbarans are now on their way to attack the airbase . Fearing they might not be able to hold the airbase , thereby allowing Krell to escape and use his knowledge of the Republic against them , Rex and his men decide that the renegade Jedi is too dangerous to be left alive . Returning to the prison , Fives releases Dogma , and watches as Rex prepares to formally execute Krell . Krell taunts the captain , confidently asserting that Rex is unable to actually fire the killing shot . Rex hesitates , but then Krell is suddenly shot in the back by Dogma , using a pistol slipped from Fives ' holster . Dogma tells the other Clone troopers that he " had to do it . " As the clones regroup at the airbase , Fives informs Rex that Obi - Wan ' s men have routed the remaining Umbarans and secured all sectors , marking the end of the invasion . Dogma is taken into custody , receiving a nod of affirmation from Rex for his act . As Fives and Rex watch the wounded being carried away , Rex questions the reasons for the war . Fives attempts to reassure Rex by stating that the war will end one day , to which Rex responds by questioning what will happen to the clones when it does end . A good question , which none of the clones are able to answer Continuity . First mentioned in the " " Launch Pad " " article of " Star Wars Insider 129 " , the episode was erroneously introduced as " Carnage of Krall . " An update to the StarWars . com " Events " section clarified that the episode ' s correct name was " Carnage of Krell . " . When Tup fires at Pong Krell , he fires two shots , but Krell deflects three from Tup ' s direction . After the troopers attempt to arrest Krell he jumps out of the window with his blue lightsaber in his right hand , but when he lands the green lightsaber is in his right instead . When Rex and his men march to the tower , Rex is in the center of the group where Anakin would be . As the clones prepare to arrest Krell , he says " it ' s treason , then " and begins his rampage . These scenes echo the scenes in " " when the clones march on the Jedi Temple and when Mace Windu attempts to arrest Supreme Chancellor Palpatine . Chris Glenn developed a complete Umbara alphabet for this episode . The episode ' s Director ' s Cut was included in the DVD .