CT - 5555 CT - 5555 , also referred to as ARC - 5555 and previously designated as CT - 27 - 5555 , was a clone trooper who served in the Grand Army of the Republic during the Clone Wars . Due to his clone designation , he was given the nickname " Fives . " Originally a clone cadet during the early phase of the pan - galactic conflict between the Galactic Republic and Confederacy of Independent Systems , Fives completed his training on Kamino and attained the rank of trooper alongside his teammates in Domino Squad . As a newly - trained soldier , he was stationed in a Republic outpost on the Rishi moon at the time of a Separatist attack on the installation . As one of only two survivors , Fives was recruited into the 501st Legion . Following the successful defense of Kamino , he joined the ranks of the elite Advanced Recon Commando s along with CT - 1409 ( " Echo " ) , the only other survivor of the attack on Rishi Station . Following the capture of Jedi General Even Piell , Fives was deployed with a team of Jedi and clones to Lola Sayu in order to rescue the imprisoned General from a facility known as the Citadel . Though the team sustained multiple casualties over the course of the mission , resulting in the death of Piell and the loss of Echo , who was presumed dead , Fives was among the survivors rescued by Jedi General Plo Koon . Later in the war , Fives served with the 501st during the Battle of Umbara . During the campaign , he played a key role in both the capture of the Umbaran airbase and the destruction of the Separatist supply ship . However , the clones ultimately discovered that their general , the Besalisk Jedi Master Pong Krell , had betrayed the Republic , deceiving his own clone troopers into fighting each other . As a result , Fives participated in their efforts to capture the fallen Jedi . While attempting to take Ringo Vinda from the Separatists , Fives witnessed the death of Tiplar , a Jedi General executed mid - battle by CT - 5385 ( " Tup " ) . A chain of events was set in motion by the preemptive execution of Clone Protocol 66 , leading Fives to discover a conspiracy involving inhibitor chips , a plot to destroy the Jedi Order , and — to an extent — Supreme Chancellor Sheev Palpatine ' s connection to it . After failing to assassin ate Palpatine , Fives sought to warn the Jedi but was confronted by Clone Commander CC - 1010 ( " Fox " ) and a contingent of Coruscant Guard shock troopers . Although Fives was killed before he could prove expose the conspiracy behind the inhibitor chips , not every clone executed Order 66 . At least three clones — CT - 7567 ( " Rex " ) , CC - 3636 ( " Wolffe " ) , and CC - 5576 - 39 ( " Gregor " ) — removed their chips prior to the activation of Order 66 . As such , they did not turn against the Jedi unlike the rest of the clone army that went on to serve the Galactic Empire . Biography . Clone Cadet on Kamino . During the first year of the war , Fives , along with Droidbait , Hevy , Echo , and Cutup were clone cadet s in Domino Squad . The other clones in Domino Squad called Fives by his number , CT - 27 - 5555 , although Fives would rather be called by his nickname . Domino Squad was reckless , and they rarely got along as a team . Their training was overseen by bounty hunters Bric and El - Les , and Jedi Master Shaak Ti . The cadets were given a test and to pass it , all cadets must successfully work as a team without any injuries . During one of Domino Squad ' s combat simulation tests , Droidbait broke away from the group and was shot . El - Les and Commander Colt ended their test and failed the team for their inability to function as a cooperative unit . The cadets went to their sleeping quarters , but Fives and fellow cadet Echo went to Shaak Ti and asked for a transfer to a new squad . Ti declined their request , and she revealed she had faith within Domino Squad and allowed the team to try the challenge one more time . During the test , Fives , along with his squadmates , noticed that they did not have their ascension cables due to tampering in their equipment by a still skeptical Bric . The clones decided to assist one another in free - climbing the turrets along the sides of the Citadel to complete their task . It proved a success and Domino Squad celebrated their victory , finally coming to know one another as brothers and a team . Ti and El - Les commended Domino Squad ' s efforts , and all five cadets were given medals as a symbol of their graduation from clone cadet to full fledged members of the Grand Army of the Republic . Service on the Rishi Moon . After graduating their basic Kamino training , CT - 5555 and his fellow rookies , Hevy , Cutup , Droidbait , and Echo , were given their first assignment . Assigned to the Rishi moon , the clones were charged with protecting and operating a Republic listening post . Led by a clone trooper sergeant , the rookies were the only form of defense during an attempted Separatist takeover of the listening post . Following the initial assault from Separatist commando droids , Fives , Echo , Cutup and Hevy managed to escape the base onto the moon ' s surface . Unfortunately , they were attacked by a Rishi eel which killed Cutup . After the arrival of Clone Commander Cody and Clone Captain Rex , who were visiting the base for a routine inspection , Fives and his comrades warned the officers with a signal flare that the base was occupied by droids . Fives met Captain Rex and Commander Cody for the first time after they rappelled from the platform . The clone troopers then decided to retake the base . Following the successful recapture , Fives assisted the clone officers in securing the base and working to fix the signal . After noticing a Separatist invasion fleet approaching the moon , Fives , Commander Cody , and Hevy located the armory and secured weaponry for the entire clone group . After fighting back a second wave of battle droids , Fives and the clone group escaped through a maintenance hatch to the moon ' s surface . Clone trooper Hevy stayed behind and destroyed the station , effectively alerting the Republic of the invasion and sacrificing himself . After being rescued by the Republic , Fives and Echo , the only survivors of Domino Squad , were invited to join the 501st clone battalion by Captain Rex . Battle of Kamino . Fives , Echo and the rest of the 501st returned to Kamino to defend it an oncoming Separatist invasion . Being back on their homeworld after months away proved surreal to the two surviving members of Domino Squad . In preparation for the defense of the planet ' s cloning facilities , they met 99 , a deformed maintenance clone who had been kind to the Domino ' s during their training , and informed him of Hevy ' s death . Saddened by the news , 99 revealed Hevy ' s graduation medal , which had been a gift between the two clones , to Fives and Echo . After a moment of sadness between the three clones , 99 volunteered to help prepare for the invasion . When Ventress ' s Trident - class assault ship s attacked , Fives and Echo were assigned as snipers to hold off the oncoming droid forces . With 99 ' s help , the duo was able to stall the advancement of Separatist forces . In the midst of the chaos , the three clones happened upon a team of lost cadets and escorted them to safety . As Grievous and Ventress advanced further into the heart of Kamino in the search of genetic samples of the Republic ' s clone army , the group was found by Captain Rex and Commander Cody at the cadet barracks . After 99 helped them gather weapons from a nearby armory , the group staged a trap for the incoming droids . Together , the troopers , the cadets , and 99 were able to defeat a squad of Grievous ' s battle droids . However , the battle ended in grief ; 99 died trying to help his brothers . After the battle was over , Fives and Echo were promoted by Captain Rex to ARC trooper for the role they played in the defense of Kamino . Battle of Lola Sayu . Following their promotion and training to ARC trooper , Fives and Echo were assigned to Kenobi ' s and Skywalker ' s mission to rescue Master Even Piell from the Citadel on Lola Sayu . After being frozen in carbon to sneak past Separatist life - form detecting scanners , the rescue team was successful in infiltrating the Citadel . They were able to get inside the Citadel and free Piell , Captain Wilhuff Tarkin , and some captive clone officers from Commander Sobeck ' s prison . Pursued by Separatist security , the rescue team was forced to split up to protect the vital intelligence carried by the Piell and Tarkin . Echo and Fives joined Skywalker ' s team through the old tunnels beneath the Citadel , along with Tarkin . Pursued by Separatist forces , Skywalker ' s team was initially delayed in their attempts to rendezvous with Kenobi ' s . An impromptu plan was developed to meet back at the Citadel ' s airfields and hopefully use Separatist aircraft to escape . While the teams reunited , Sobeck ' s security droids amassed in force . During a fierce firefight , Fives and Echo tried to reach the shuttle . Echo made it to the ship ' s ramp but was killed when a commando droid blew up the shuttle . Lacking any time to retrieve a body or mourn , Fives and both teams were forced to flee the airfield . Unbeknownst to them , Echo in truth survived and was captured by the Separatist . It would be the last time Fives will ever see Echo Fives and the others made their escape across Lola Sayu ' s shadowy landscape , fighting Sobeck ' s battle droids and being tracked by his Anooba s . Piell was killed when the anoobas caught up , but managed to transfer his half of the intel to Ahsoka Tano . The team finally reached the rendezvous point to await Master Koon ' s extraction team . When a desperate Sobeck himself attacked , Fives was able to shoot him down from his STAP allowing for his eventual death at the hands of Ahsoka . Fives and the others were then rescued and returned to Coruscant . Battle of Umbara . When Umbara seceded from the Republic , Fives was re - assigned to the 501st , becoming the only assigned ARC Trooper in the battalion for the upcoming campaign . He was also present in the initial ground assault against Umbaran forces , even rescuing fellow trooper Hardcase from local wildlife . Following the establishment of a forward position , Anakin Skywalker was called off planet . In his place , the venerated Jedi General Pong Krell was assigned as temporary leader of the 501st . Fives quickly drew issue with Krell ' s firm and seemingly reckless style of leadership , which often led to the unnecessary endangerment and death of fellow clones . Fives joined Rex in voicing his direct concern with the Besalisk ' s leadership style , only to be met with a drawn lightsaber . Following a failed attempt at reaching the Umbaran Capital , Fives and the rest of the 501st then held their ground against increasing enemy resistance . Efforts were refocused when Krell received orders to target a critical airbase . Krell ordered a full frontal assault through a valley . Again , Krell ' s leadership style led to the death of dozens of soldiers , further enraging Fives . Despite Rex ' s insistence that he keep a level head for the sake of the rest of the troops , Fives advocated for a plan of action separate from Krell ' s . As more troops perished in action against advanced Umbaran military technology , Rex sent Fives and Hardcase , against Krell ' s wishes , to capture enemy aircraft and assist in the battle . Despite a lack of familiarity with the technology , the plan proved to be a success . Fives and Hardcase were able to enter the base undetected , commandeer two enemy starfighters , and secure a victory . While Krell expressed his frustration with the insubordination , he begrudgingly accepted the victory it afforded him . With the base captured , Fives continued to voice his frustration with Krell to Rex . He found himself repeatedly rebuffed as Rex struggled to hold the battalion together under Krell . After a series of long range missile attacks threatened both the base and the 212th Battalion , Fives approached Rex with a plan hatched by himself , Hardcase , and Jesse to utilize the captured Umbaran fighters and launch a sneak attack on the unsuspecting Separatist supply ship , hopefully ending the airstrikes . Rex eagerly presented the plan to Krell . When Krell refused to authorize the plan , the three clones undertook the mission anyway . The trio sneaked out of the airbase in Umbaran Starfighters . When Krell demanded to know where the clones had gone , Rex covered for them . In space , Fives , Hardcase , and Jesse successfully destroyed the supply ship , but not without the loss of Hardcase , who sacrificed his life so his brothers could live another day . Fives and Jesse escaped the exploding supply ship while Hardcase slammed one of his starship ' s missiles into the supply ship ' s core . Upon their successful return , Fives and Jesse shared their victory and grief with Rex and Tup , who had run out to meet them . They were interrupted by clones sent by Krell to fetch Fives and Jesse . In the base ' s tower , a furious Krell yelled at Fives and Jesse and arrested the clones with the intention of having them court martialed . Rex opposed Krell ' s decision , even trying to take the punishment himself . However , Rex only angered Krell further . The Jedi ordered the immediate execution of Fives and Jesse . As Fives and Jesse were lined up to be killed by a firing squad of their brothers , led by Dogma , Fives made a plea to his fellow clones . He said that he felt that his actions were justified , and that clones , as people , shouldn ' t follow orders when they know the orders are wrong . The clones , realizing that they held a greater loyalty to justice and each other than their general , fired , but missing , then lowered their weapons and refused to carry out Krell ' s orders . Before the general could retaliate , word reached the base that a portion of the 212th had been captured by Umbaran natives who were now posing as clone soldiers . Fives and Jesse were put back in the brig while Krell sent Captain Rex and the rest of the 501st clone troopers out to stop the disguised enemies . The 501st engaged their foes , resulting in massive casualties on both sides . The battle was cut off when Rex realized that the opposing soldiers were clones of the 212th , also sent under Krell ' s orders . Led by Rex , the furious remainder of the two battalions returned to the airbase with the intent of arresting General Krell for treason against the Republic . After releasing Fives and Jesse from the brig , the group found Krell in the tower . When they accused Krell of treachery , he admitted he had been secretly manipulating the soldiers all along . After a brief encounter with a confused Dogma , the clones out out to catch the former Jedi . What followed was a desperate and deadly attempt at capture during which dozens of clones died . It ended when Tup , with the help of a native Vixus , managed to deceive and detain the mad general long enough to stun him . Now a prisoner of the clones , Krell revealed to Fives and his brothers that his actions on Umbara were due to a lack of faith in the Republic and intended to gain the loyalty of Count Dooku . Fives , Rex , and the rest of the 501st leadership debated what to do with the dangerous rogue Jedi they now held captive . When news broke that General Kenobi ' s forces had captured the planet ' s capital and that the remaining Umbaran military were headed directly for their current position , it was decided that Krell should be executed . When Rex hesitated to kill his former general , a distraught Dogma fired the killing blow . With Krell dead and the Umbarans subdued , Fives left the shadowy planet with shaken faith in his place in the Republic ' s war effort , asking Rex , " What ' s the point of all this ? " The Biochip Conspiracy . Fives continued to serve as an active member of the 501st throughout the latter years of the war . In the process , he grew close with his fellow clones and fostered strong friendships with the different members of his battalion . Later , Fives , along with the rest of the 501st , took part in a military campaign to defeat Separatist forces led by Admiral Trench occupying space station surrounding the world of Ringo Vinda . In the process of battle , a fellow clone and close friend of Fives , Tup , fired upon and killed Jedi General Tiplar . In the chaos , the 501st were forced to retreat . While Tup appeared to be unaware of his actions , he continued to display strange behavior and lash out violently towards Jedi . Both Jedi and clone leadership determined that Tup should be sent to Kamino for further evaluation . However , in the process , Tup was temporarily captured by Separatist forces on his departure from the station . Together Fives , Rex , and Anakin Skywalker were able to retrieve a still unconscious Tup before Trench ' s droids could abscond with him . Concerned for his friend ' s safety , Fives requested that he accompany the troubled clone to Kamino . Upon arriving at Kamino , the facilities medical leader , Nala Se , said that Tup ' s strange behavior may in fact be a virus requested that Fives stay behind on the planet to undergo examinations alongside his friend . Fives agreed , primarily to keep an eye on the treatment of his friend . He quickly grew suspicious of the care afforded to Tup , and began to suspect the Kaminoans of possessing an ulterior motive . With the assistance of medical droid AZ - 3 , who created a diversion , Fives performed a dangerous level 5 brain scan on Tup . Fearing for Tup ' s immediate safety , Fives and AZ - 3 removed the tumor from his brain . While the operation appeared to be a success , Shaak Ti and Nala Se discovered his insubordination and reprimanded him for his risky behavior . Despite Fives ' s efforts , Tup died after whispering his final words to his devastated friend . With Tup ' s passing , Fives was seemingly cleared from his own examinations and ordered to return back to the frontlines with the 501st . However , a passing comment from AZ - 3 revealed that the Kaminoans in fact intended to wipe his brain and reassign him to maintenance . In a moment of desperation , Fives lashed out against Kaminoan security and fled into the depths of the facility with his droid friend in tow . Now convinced that there was more to his friend ' s death than previously appeared , he stole the tumor to conduct further tests of his own . Together with AZ - 3 , Fives was able to determine that the tumor itself was in fact an artificially designed organic chip inserted into Tup ' s head . Further investigation revealed that the chip itself was installed during the earliest stages of clone embryo development . Fearing for his own safety , Fives ordered AZI - 3 to remove the chip from his own brain . Comparing Fives ' and Tup ' s chips , AZI - 3 and Fives discovered that Fives ' s chip appeared to be healthy and functioning properly while Tup ' s suffered from some form of decay . Shortly after discovering this , he was discovered by Nala Se and the rest of the Kaminoan security forces . While Nala Se insisted that the chip was designed to curb aggression among clones , Fives argued that the chip itself was reason for suspicion . His words convinced Shaak Ti and she requested that Fives be sent to Coruscant to undergo further tests and to plead his case to the Supreme Chancellor . While en route to Coruscant , Nala Se injected Fives , barely conscious due to the stress of his impromptu surgery , with a form of mind clouding drug . Supreme Chancellor Palpatine himself met with Fives along with Nala Se and Shaak Ti . Despite his best efforts , Fives ' s description of his experiences were unable to convince any of the other members of the meeting of his belief of a conspiracy . Despite Nala Se ' s insistence that Fives was suffering from paranoia and mental degradation , Palpatine requested to speak to the soldier alone to hear his story in further detail . After Shaak Ti and Nala Se had left , the Chancellor lashed out and attacked Fives , who in a moment of self defense was framed as a potential assassin . Now a fugitive from justice , Fives fled into the bowels of Coruscant , looking for potential allies and anyone who might hear him out . Eventually , he arrived at the clone bar , 79 ' s . There he managed to convince his longtime friend , fellow 501st soldier Kix , to contact Anakin Skywalker and Captain Rex so that they could speak privately . To Fives ' surprise , both Skywalker and Rex appeared at his requested meeting spot . Fearing that neither would listen to his story , he trapped both in a ray shield . Agitated by his experience and by Nala Se ' s drugging , Five ' s attempts to explain his actions and his discoveries proved incoherent . When Skywalker accused Fives of trying to assassinate Palpatine , the tension escalated . Midway through his explanation , Commander Fox and a squad of Coruscant guards arrived to arrest him , sent by Palpatine . Desperate not to be captured , a terrified Fives reached for one of Rex ' s discarded blasters . After a warning , Fox shot Fives in the heart . Fives spent his final moments in Rex ' s arms , where he spoke his last words , reciting Tup ' s , having finally found peace . Legacy . While Fives ' s discovery of the presence of a control chip within the clone anatomy did not prevent the mass execution of the Jedi as he hoped , his efforts ultimately did help his brothers . Several clones including Rex , Wolffe , and Gregor eventually removed their chips . Fives also assisted in several crucial military campaigns . Personality and traits . Fives began his life as an eager and relatively complacent member of the Grand Army of the Republic . He spent his first 10 or so years on Kamino , receiving military training with the rest of his squad . When Domino Squad was eventually assigned to guard the quiet Rishi moon outpost , its members were eager to experience the action of the front lines . From the start , Fives demonstrated a strong ability to empathize and care for his fellow clones . He developed a particularly close bond with Echo , the only member of his squad to survive the Rishi moon , and the two progressed together through the ranks of the 501st . Following Echo ' s apparent death , Fives ' s affection and loyalty to his clone brothers began to overshadow his commitment to the Republic and the war effort . By the time of the Battle of Umbara , Fives showed no qualms in voicing criticisms and concerns with his superiors regarding the treatment of his brothers . This loyalty to his fellow clones would ultimately lead him to his ill - fated investigation into the origins of a bio - chip implanted in the brains of himself and his fellow clones . Fives made friends and developed close relationships with many of the other members of the 501st , including Captain Rex , Tup , Jesse , Kix , Hardcase , and Echo . He also had positive relationships with Obi - Wan Kenobi and Anakin Skywalker , the latter whom was saddened by his death . Fives sported a tattoo on his right temple of the number " 5 " in accordance to his nickname and clone number designation . Equipment . During his time as a cadet , Fives wore standard training armor and used a DC - 15 blaster rifle . Upon graduation , he wore standard trooper armor , which he decorated with blue stripes , a stylized blue and red Rishi eel running down the top of the helmet , and an image of a Z - 6 blaster cannon on his shoulder upon entering the 501st Legion . He continued to use a DC - 15 blaster rifle while he was in the 501st Legion . When he was promoted to ARC trooper , he kept the blue markings and Rishi eel art on his ARC armor , and began using twin DC - 17s like his friend Rex , though he continued use the DC - 15A from time to time . Behind the scenes . The author Paul S . Kemp confirmed on Twitter that he mistakenly referred to Fives as " Sixes " in the novel " Lords of the Sith " , an error which was corrected in later copies of the book .