CT - 1409 CT - 1409 — nicknamed " Echo " — was a clone trooper who served the Grand Army of the Galactic Republic during the Clone Wars . Born on Kamino , Echo was originally identified as CT - 21 - 0408 , a cadet of the Domino Squad along with his friend Fives , before he graduated into the Republic army . On his first assignment , Echo was tasked with guarding the Rishi Station moon base , where he , along with Fives and the Clone Captain Rex , aided in warning the Republic of an impending Separatist attack on Kamino . Echo was commended for his bravery and absorbed into the 501st Legion . After the attack on the Rishi moon , Echo defended his homeworld from Separatist forces as they attacked Tipoca City , where they sought to destroy the Republic ' s cloning facilities . Once the 501st successfully repelled the attack , Echo and Fives were both promoted to the elite rank of ARC trooper . Echo was later tasked with a mission to Lola Sayu , where he and the 501st were to retrieve coordinates to the Nexus Route from the Jedi Master Even Piell , who had been imprisoned on Lola Sayu ' s Citadel . Despite Piell ' s death during the mission , it was ultimately a success , but Echo was seemingly killed when trying to secure an escape . The severely injured Echo was taken prisoner by Separatists forces , where he was sold to the foreman of the Techno Union , Wat Tambor . Echo was kept alive by being turned into a cyborg , albeit at the cost of his consciousness . He became an unwitting pawn for the Separatists during their campaign on Anaxes , led by the Admiral Trench . When Rex found traces of Echo ' s survival , he , accompanied by Clone Force 99 and the Jedi General Anakin Skywalker , led a mission to rescue Echo on Skako Minor . They succeeded , and , in turn , Echo used his cybernetic capabilities to turn the tide against the Separatists on Anaxes , leading to the Republic ' s victory . Biography . Graduating Domino Squad . CT - 1409 was born on the planet Kamino , as all the clone trooper s of the Galactic Republic were . He sarcastically received the nickname " Echo " for having a tendency to repeat orders during training exercises , annoying his fellow troopers . Echo lived in the barracks of Tipoca City , where he endured physical and mental training , and was identified by the designation CT - 21 - 0408 as a cadet . Like all clones , Echo was a genetic copy of the once renowned bounty hunter Jango Fett , although , due to the millions of clones straining what DNA was left of the deceased Fett , it was speculated by the Kaminoan Administrator Lama Su that Echo , along with the other cadets in his unit , was too deficient to be a soldier . During one of their final training exercises , Echo and Domino Squad — the cadets CT - 4040 " Cutup " , CT - 00 - 2010 " Droidbait " , CT - 5555 " Fives " , and CT - 782 " Hevy " — had failed to work together on the field , causing them to fight amongst each other . Echo insisted that the squad simply follow orders to pass their training , for which he was mocked by Hevy as the squad cast blame for the failure on each other . The string of recent disappointments by Domino Squad caused their trainers — the Togruta Jedi Shaak Ti , the Siniteen Bric , and the Arcona El - Les — to grow concerned about their chances of successfully being inducted into the Grand Army of the Republic . Shaak Ti observed that Echo had issues adapting to the battlefield , as he was too busy trying to impose the rules of the exercise on his squad - mates , and Bric wanted to flatly abandon the whole squad . Soon after , the ARC trooper Colt visited the cadets with the intention of pitting them against their final test . On the mock - battlefield , Echo and Domino Squad were expected to face nonlethal battle droid s and climb to the top of a citadel . However , the squad was unable to work together yet again , automatically failing the test when they chose to leave an injured Droidbait behind . Colt reprimanded Echo and the others for breaking the most important rule of working as one . Following their failure , Echo and Fives requested a transfer to Bravo Squad , a group that had easily passed the citadel challenge , as they were unable to cooperate with the rest of team . Shaak Ti denied their request , insisting the clones reassess their teamwork before they take on their last chance at the final challenge . The next day , Echo and Domino Squad went into the challenge with a renewed inspiration ; Hevy had received encouragement from the malformed clone 99 , a member of the maintenance crew , while Cutup had proved resilient when Bric tried to goad him into a fight . Echo and his team coherently made their way through the battle droids on the battlefield , making it to the citadel without trouble . However , they were unable to conventionally scale the tower when they realized their ascension cables were not with them , having been removed by Bric beforehand without their knowledge . In a surprise to Bric , the clone cadets managed to strategize and used the citadel ' s blaster cannon s to scale the tower after neutralizing them , leading to their success . Shaak Ti , in that moment , believed the squad to be one of the best she had ever seen . Echo and the other members of Domino Squad henceforth became clone troopers , and were sent on their first deployment to partake in the Clone Wars . Rookie on the Rishi Moon . Echo ' s rookie post , along with the rest of Domino Squad , was on the Rishi moon in the Outer Rim Territories . Echo served under Clone Sergeant O ' Niner , and took a liking to the quiet outpost , using the time to catch up on Republic army regulations . Despite the seeming simplicity of their post , the former Domino Squad did not realize the importance of the Rishi Station , as it was a listening post to ensure that no attack came to Kamino , their homeworld , by broadcasting a continuous all - clear signal . Unbeknown to Echo or the rest of the stationed clones , the Separatist Alliance General Grievous planned on invading Kamino with a fleet of " Munificent " - class star frigates and Droid Control Ships , all of which were in orbit near the Rishi moon . Grievous sent an infiltration squad of BX - series droid commando s , a battle droid type the clone troopers had not seen up to that point in the war , to covertly take over the Rishi outpost . After killing the clone trooper sentry outside , the droid commandos made their way into the outpost and attacked the clones . Echo — along with Cutup , Fives , and Hevy — escaped through a ventilation shaft , but Droidbait , a trooper named Nub , and O ' Niner were all killed . As the surviving clones made their way outside of the base and onto the barren cliffside , Cutup was killed by a native Rishi eel , which the rookies were unable to stop . Echo and the others then watched as a Republic transport , unaware of the situation and on a routine inspection , landed on the Rishi Station ' s landing platform above . The trio fired a droid attack flare into the sky to warn the unsuspecting Republic forces , and , above , the Clone Commander CC - 2224 " Cody " and Captain CT - 7567 " Rex " saw the warning flare and blasted the disguised droid which had just greeted them . The two experienced clone troopers were then attacked by the droid commandos that had been hiding nearby , and their shuttle was destroyed by a thermal detonator . To escape the blast , Cody and Rex jumped off the landing platform , finding their way to the clone rookies shortly after . Echo and the others were then forced by Rex to remove their helmets to prove they were not droids , just moments before a Rishi eel attacked the clones again before it was killed by the Clone Captain . Once the danger had passed , Rex devised a plan to infiltrate the station by disguising his voice as that of a droid commando . Once at the blast door s of the Rishi Station , Rex successfully tricked the droids inside to open the entrance , and the group blasted their way through the remaining droids . Echo and the others , whom Rex had been referring to as " shinies " for their unscathed armor , experienced their first droid kills during the assault . After Cody checked the all - clear signal , he realized the droids had hard - wired it , making it impossible to deactivate immediately . The clones realized they had little time once a landing craft of battle droids sent by Grievous to reinforce the droid commandos , which had not checked in , arrived on the platform outside . Rex suggested the clones instead destroy the Rishi Station , which would force the all - clear signal to cease , warning any nearby Republic fleets . Echo recommended using the station ' s liquid Tibanna fuel reserve for the job , as the substance was highly explosive and was regularly used to heat the station from the cold Rishi weather . Rex and the others agreed , and they armed themselves to repel the oncoming droid assault . While Cody , Fives , and Hevy held the droid forces at bay , Echo and Rex prepared the explosive Tibanna by arming it to the station ' s Gonk power droids , and linked them to a detonator . After it was set , the clone troopers prepared to make their exit from the base , but the remote detonator failed , forcing Hevy to manually detonate it instead as Echo and the others escaped . Once the clones made it outside , Hevy was unable to follow after he was gunned down , but he successfully set off the detonator , completely obliterating the Rishi Station and the battle droids in the explosion . Once the all - clear signal stopped broadcasting , the Republic fleet , realizing that invasion could be imminent , entered the Rishi system and engaged Grievous ' fleet , forcing the outnumbered Separatist General to flee . For their bravery as rookies and as the sole survivors of their post , Echo and Fives were commended by the Jedi Generals Obi - Wan Kenobi and Anakin Skywalker aboard Kenobi ' s " Venator " - class Star Destroyer , " Resolute " , and were absorbed as members of Skywalker ' s 501st Legion . After joining the distinguished battalion , Echo and Fives both worked with Rex on strategic algorithms for the Republic war effort . Defending Kamino . Sometime after the Rishi Station incident , Obi - Wan Kenobi and Anakin Skywalker intercepted a holographic message between Grievous and the Dathomirian assassin Asajj Ventress , which stated they were proceeding with an invasion of Kamino . After arriving at Tipoca City , Echo and Fives were both happy to be home , reuniting with clone 99 . They informed 99 of the news of Hevy ' s death , who had given 99 his graduation medal before leaving Kamino for the Rishi Station . 99 was eager to help the two clone troopers in preparations for the oncoming Separatist assault and joined with Echo and Fives . Soon after , Grievous ' fleet arrived and immediately began its assault on Kamino , with Ventress seeking to steal Jango Fett ' s DNA from the cloning facilities . After the battle started , the ARC trooper Havoc assigned Echo and Fives to take sniper positions above Tipoca City , noting it would be a dangerous assignment , and the two clones obliged . Meanwhile , 99 assisted Havoc ' s company by supplying blaster rifle s , but Havoc was killed shortly after demanding the malformed clone take refuge . 99 then met with Echo and Fives as they fired on an onslaught of aquatic droids , and helped the pair by supplying them with grenade s , doing what he could to aid the clone troopers in battle and prove his own worth as a soldier . Echo and Fives , desiring a better sniping position , agreed on making their way to the armory with 99 and a group of cadets that had been separated from the others . Echo and Fives both tried to inspire confidence in the clone cadets , reminding them that they were fighting for their home . The entourage of clones successfully reached the armory near the barracks , where they were confronted by General Grievous and a group battle droids . Kenobi showed up and confronted the General himself , dueling Grievous in lightsaber combat and leading him away from the armory . Echo and the others were then cornered in the barracks , where they set a trap for the oncoming battle droids using the bunks as cover for the cadets . The troopers ran out of grenades to use against the droids , so 99 made his way to retrieve more , where he was shot down from behind , much to Echo ' s dismay . Soon after , the battle was won as the Separatist Droid Army , including Grievous and Ventress , was routed all throughout Tipoca City , and the clone troopers mourned the death of their clone brother . Once the battle ended , Cody and Rex commended Echo and Fives for their courage and effort in the battle , officially promoting them to the elite rank of ARC troopers . Both clones accepted the promotion and stated that they did what any clone would have done for their home . Mission to the Citadel . Some time after the assault on Kamino during the Clone Wars , the Lannik Jedi Master Even Piell was captured by Separatists for his knowledge of the coordinates to the Nexus Route , a vital hyperspace route for the Republic . The 501st , including Echo and Fives , was tasked with Piell ' s rescue , led by Obi - Wan Kenobi and Anakin Skywalker . Piell was being held at a prison known as the Citadel on the planet Lola Sayu , a prison built to hold Jedi in particular . To get to the Citadel covertly the rescue group was frozen in carbonite , which prevented having their life signs detected aboard their transport . Subsequently , the astromech droid R2 - D2 and a group of its reprogrammed battle droids piloted the shuttle into Separatist space over Lola Sayu . After the shuttle gained passage to the Citadel once no signs of life were detected aboard , it landed in a remote area where R2 removed Echo and the crew from the carbonite blocks . The weather was too violent for the clone troopers to use jetpack s to climb the Citadel prison wall , so they used ascension cables and climbed by hand . Echo and the others witnessed the clone trooper Charger lose his balance and fall down the exterior prison wall , colliding with an electromine , which alerted the Phindian Citadel Warden , Osi Sobeck . Despite Sobeck sending his forces after the rescue group , Echo and company were able to fight their way — which included avoiding electrified magnetic walls — to Piell ' s location , where they freed him from the prison ' s interrogator droid . Piell informed his rescuers that his crewman , Captain Tarkin , had memorized one half of the Nexus Route coordinates , while he had memorized the other . Echo and company then fought their way to free Tarkin and the rest of Piell ' s surviving crew , before they split up , with Kenobi and Piell creating a distraction for the others to escape and meet up afterward . Skywalker led Tarkin , as well as Echo and Fives , into the fortress ' tunnels , an advantage Fives noted they had due to old Citadel archive data they possessed . As the two groups headed to the rendezvous point to meet with R2 - D2 and the shuttle , the astromech fooled the prison ' s tactical droid into letting it inside the prison , acting as a prisoner of its own reprogrammed battle droids . This allowed Sobeck to set a trap around the abandoned shuttle , luring Kenobi and Piell into capture , which R2 used as an opportunity to meet with the Jedi Masters . In the meantime , Echo and Fives held off attacking battle droids as their group made its way through the tunnels , with the Padawan Ahsoka Tano taking point until they reached a fuel pipeline . Echo and the others used the fuel line to make their way to the rendezvous , unaware that Kenobi and Piell had been captured , where they expected an extraction by R2 . When the astromech failed to arrive , Skywalker led Echo and the others on his " Plan B " — to board the shuttle by force . They were met with resistance , including numerous crab droids and battle droids on STAP repulsorcraft , as well as the threat of laser turret s . As the battle continued , Echo witnessed a droid commando making its way for one of the laser turrets , intending to use it to destroy the rescue crew ' s shuttle . Echo attempted to stop the droid , carrying a personal riot shield as he fired his blaster pistol towards it , but ultimately failed . The droid successfully fired upon the crew ' s escape shuttle , causing a large explosion that caught Echo in the blast . He was thought to be killed in said blast , as Fives and the others saw only his charred ARC Trooper helmet remained . Without a transport , the crew retreated from the battle scene and called to the Jedi Council for aid , requesting an evacuation . Eventually , the mission was a success after the Kel Dor Jedi Master Plo Koon rescued what remained of the group . As intended , Tano and Tarkin delivered the two halves of the Nexus Route coordinates , although Tano only received her half from Piell after the Jedi Master was killed - in - action against Sobeck ' s hunting anooba s . In truth , Echo survived without the knowledge of the Republic , although he was severely injured , sustaining wounds that cost him his right arm , legs and lower torso . Echo was subsequently unable to resist the Separatist capture that followed . Pawn of the Separatists . Following his capture by the Separatists , Echo was transformed into a cyborg . He was outfitted with cybernetic replacements for his lower torso and legs , while his right arm , which he had lost , was replaced with a socket - arm that allowed him to interface with computer systems . Sometime following his capture , Echo was sold to the foreman of the Techno Union , Emir Wat Tambor , and further experimented on . Tambor had the intention of using the clone for counterintelligence using Echo ' s knowledge of strategic Republic algorithms , as , despite claiming neutrality in the war , the Techno Union was secretly allied with Separatists . Tambor took Echo to Skako Minor , where the clone trooper was placed in stasis — to prevent him from regaining control of his consciousness — and forced to remotely feed information for the Separatists ' campaign on the planet Anaxes . Neural and respiratory systems kept Echo both under control and alive during the long time he was in stasis , and on Anaxes , due to Echo ' s unwitting part , the Republic efforts to repel the Separatists from their shipyard s was failing on over a dozen fronts . When the 501st arrived on Anaxes , Rex suspected that the Separatist Harch Admiral Trench was using Rex ' s own strategic algorithms against the Republic . Since the Captain did not understand how this could be possible — as Echo was thought dead and Fives had previously been killed , both who had worked with Rex on the algorithms — he took it upon himself to investigate the source of Trench ' s intelligence . Along with Clone Force 99 , a group of experimentally enhanced clone troopers calling themselves the " Bad Batch , " Rex infiltrated a Separatist base where he discovered the source of Trench ' s strategic signal . Rex was shocked when the signal , coming from Echo on Skako Minor , identified itself as " CT - 1409 , " Echo ' s clone trooper designation number . Despite Obi - Wan Kenobi ' s attempts to deter Rex , the Clone Captain planned on rescuing Echo , taking Anakin Skywalker and Clone Force 99 — the " Bad Batch " commandos Crosshair , Hunter , Tech , and Wrecker — with him to Skako Minor . Prior to rescuing Echo , both Skywalker and Hunter considered the option that Echo had become a turncoat , which Rex vehemently denied . Once on Skako Minor , the crew was able to infiltrate the Techno Union ' s headquarters in the city of Purkell , where they faced numerous D - wing droid s before making their way to Echo ' s stasis chamber . Once there , Tech deactivated Echo ' s pod and Rex pulled him free . Echo regained consciousness and remembered only his last moments on the Citadel , but was happy to see Rex had returned for him . Immediately afterward , Tambor surrounded the stasis chamber and threatened the crew with the organic decimator device , but Echo , once Tech safely disconnected him from the computer system , was able to aid in their escape , using his knowledge of the base he acquired during his time spent connected to its computers . Echo guided the crew through the ventilation shafts to the outside , meanwhile Wrecker destroyed his former stasis chamber . After making their way out , the crew used the local keeradak s to fly away from the base , where they were pursued by the aerial D - wing droids . The pursuit led to the village of the local Poletec s , natives Rex and the others had already encountered beforehand , where Rex used Echo as an example of Separatist cruelty to rally the Poletecs to fight alongside them . In the battle that followed , Echo , despite his weakened body , took part in destroying numerous droids as the Poletecs , Rex , Skywalker , and the Bad Batch destroyed the attacking octuptarra magna tri - droids . The battle was won , and the rescue crew returned to Anaxes with Echo in tow . Hero of Anaxes . Once back in secured Republic territory on Anaxes , Echo underwent refinements on his cybernetics by medical droid s and was fashioned with new armor that covered most of his body . Echo ' s socket arm remained in - tact , and Echo was eager to fight back against the Separatists . When the Jedi General Mace Windu was briefing the 501st forces on Anaxes , Echo volunteered to commandeer a covert assault on Admiral Trench ' s forces . Although Rex was hesitant due to Echo ' s physical state , Windu was open to Echo ' s plan of infiltration . Echo proposed using his own Separatist capabilities against the Confederacy army , and planned to board Trench ' s dreadnought , a " Providence " - class dreadnought , to feed him false information about the Republic ' s strategies . Echo ensured his allies that Tambor , despite his Separatist allegiance , knew that Trench would have him killed if he found out Echo was no longer in Separatist hands . Thus , Echo justified that sending strategic signals to Admiral Trench would not be suspicious to him , and , as the Anaxes shipyards were extremely vital to the Republic forces for the Clone Wars , Windu agreed to go forward with Echo ' s plan . Echo once again traveled with the Bad Batch , Rex , and Anakin Skywalker aboard " Havoc Marauder " , Clone Force 99 ' s uniquely designed transport , to infiltrate Trench ' s dreadnought . Meanwhile , Obi - Wan Kenobi and Windu led numerous Republic gunship s into the heart of the Separatists ' war effort on Anaxes , a droid assembly complex , intending to make one final assault on the base as part of Echo ' s plan . Once " Havoc Marauder " reached Separatist space , Echo used his socket - arm to interface with the starship ' s computer systems and masked the ship ' s identity , fooling the Separatist blockade into letting " Havoc Marauder " dock with Trench ' s flagship as if it were Separatist shuttle . Once aboard , Echo and the infiltration crew made their way to a nearby communications vault , where Tech rigged an interface for Echo to use and masked his signal , making it appear as if Echo was still transmitting from Skako Minor . Echo began his ruse just as Trench attempted to contact Skako Minor , intercepting the message and successfully taking over Trench ' s strategic algorithm . Although Kenobi and Windu were already under heavy assault at the droid assembly complex , Echo sent the majority of the remaining battle droids to the Jedi Masters ' location to gather the droids together , ensuring the two Jedi that it was part of the plan . Once the battle droids surrounded the Jedi , Trench believed himself on the verge of victory until Echo remotely sent a large feedback pulse that overloaded all of the battle droids ' circuitry , which left the Jedi victorious . As part of his contingency plan , Trench remotely activated a large bomb he had built in the assembly complex ' s reactor core , which Echo detected just before they were about to depart Trench ' s dreadnought . He informed Windu , who evacuated all of the Republic forces in the Anaxes assembly complex while he attempted to disarm the bomb with Echo ' s remote assistance . However , before Echo could give Windu the final disarming sequence for the bomb , Trench — who had discovered the source of Echo ' s signal — deliberately targeted Echo ' s neural system and jammed it , knocking the clone trooper unconscious . Skywalker had anticipated the possibility of Echo failing to disarm the bomb and had gone to the dreadnought ' s bridge to confront Trench himself . Skywalker was able to strong - arm Trench into revealing the final sequence of the Anaxes complex bomb ( which Windu used to disarm it and secure the facility ) before he was forced to kill the Harch in self - defense . In the meantime , Rex and Clone Force 99 fought their way through the dreadnought ' s defenses to make their escape , Rex carrying the unconscious Echo on his shoulder . Both Crosshair and Wrecker destroyed a large number of droids that ensured a clear path to " Havoc Marauder " , where Echo and company regrouped with Skywalker . After boarding the Bad Batch ' s transport , Echo regained consciousness as they made their escape from the dreadnought . Skywalker gave Wrecker the detonator to self - destruct Trench ' s dreadnought , which he had taken from the bridge , and the clone commando successfully used it to destroy the orbit ing Separatist fleet in the ensuing explosion , just before the " Havoc Marauder " returned to Anaxes . Due to the mission ' s success , the Republic forces retook their vital assembly yards on Anaxes and , along with the Bad Batch and Rex , Echo was honored for his courage and ingenuity . Echo was subsequently promoted to the rank of Corporal and , due to his efforts , Windu informed Echo that the Republic would have a greater fighting chance across all battlefronts throughout the galaxy in the Clone Wars . After the Battle of Anaxes , Echo would go on to join the Bad Batch . Personality and traits . All clones were built to be loyal to the Republic , and Echo was no exception . He exceedingly attempted to ensure every rule was followed during his time as a cadet and later enjoyed the downtime on the Rishi moon , using it to read and catch up on regulations . From his time as a cadet , his compulsion to repeat orders to his teammates gained him his nickname — Echo — which stuck with him throughout his career . Although inexperienced at the time of the Rishi moon incident , Echo adapted quickly to battle using both his mental and military training . Echo was commended on numerous occasions for showing bravery , courage , ingenuity , and skill in battle or otherwise during his service to the Republic . Despite his expectations as a clone , Echo showed resolved when he remained loyal to the Republic even following his Separatist capture , after being left for dead on the Citadel , which included experimentation and forceful use of his mind to aid the Separatist Alliance . Although Crosshair and Anakin Skywalker both believed Echo ' s willing betrayal was a possibility , taking his seeming abandonment on the Citadel into consideration , Rex did not lose faith in Echo ' s loyalty , of which he was later vindicated when Echo remained true to the Republic and saved Anaxes . Echo , as a genetic clone of Jango Fett , was a human male with black hair , brown eye s , and tan skin . Although all normal clones of Jango Fett were physically identical to the bounty hunter , Echo was skinnier than his fellow former Domino Squad teammates , but still stood at the same 1 . 83 meter s in height . Following his Separatist capture , Echo ' s skin became pale during his time in stasis and his body was outfitted with numerous cybernetic implants — including a socket - arm in place of his right hand — but his body became weak and emaciated . Equipment . During Echo ' s time as a cadet , he and the rest of Domino Squad wore a green - colored variation of training armor , which had his cadet designation number — CT - 21 - 0408 — written in Aurebesh on his upper left leg ' s armor plating . After his induction into the Grand Army of the Republic , Echo bore the standard white armor that all clone troopers were issued . Echo and his teammates at the Rishi moon were referred to as " shinies " by Captain Rex , due to their new armor being unscathed and for Echo ' s inexperience with combat . After Rex killed a Rishi eel in defense of Echo and the clone troopers before they took back the Rishi Station , he stamped his hand , covered in the eel ' s blood , on Echo ' s armor . Echo carried this stamped handprint on his armor for the rest of his time with the 501st , even after his promotion to the rank of ARC trooper . With his new rank , Echo was issued standard ARC trooper armor and he clad it in blue paint ; this armor , along with his helmet , was destroyed when he was nearly killed on Lola Sayu . Following his rescue from Separatist capture , Echo was outfitted with new armor on Anaxes that covered his cybernetic parts and was also clad in blue — the same shade that was once on his ARC trooper armor . Behind the scenes . The character of Echo made his first appearance in the television episode " Rookies " , the fifth episode of the of the animated series in 2008 . He was voiced by Dee Bradley Baker , along with all other clone troopers in the series . Echo later appeared in the episodes " Clone Cadets , " " ARC Troopers , " " The Citadel , " and " Counterattack , " the latter in which he was seemingly killed off . When " The Clone Wars " series was canceled , numerous concepts and episodes featuring Echo went unfinished , but the series directing supervisor , Dave Filoni , teased that Echo would return following the premiere of the of " The Clone Wars " . In April 2015 , at the Celebration Anaheim " Star Wars " convention , the final unfinished episodes of " The Clone Wars " Legacy were revealed to feature Echo ' s return , and — grouped together as " The Bad Batch " — were later featured on " StarWars " . com . The concept art of Echo as a cyborg for " The Clone Wars " Legacy was penned by Kilian Plunkett and Pat Presley . Despite being unfinished , the episodes , like the rest of " The Clone Wars " series , are considered part of the official " Star Wars " canon by the Lucasfilm Story Group . There were plans for Echo to become the fifth member of the Bad Batch on a mission to Kashyyyk in additional episodes , a clip of the animatics from these episodes were shown at the convention . In the episode " The Bad Batch , " Echo was officially identified by his clone trooper designation , CT - 1409 . However , in the " Star Wars " sourcebook " Ultimate Star Wars " , released after the premiere of " The Clone Wars " Legacy episodes , Echo was identified by a different designation number , CT - 21 - 0408 . This number was taken from Echo ' s designation number seen on his training armor in the episode " Clone Cadets , " where it was fashioned on his leg . The number was never spoken aloud in the episode , although other cadets — Hevy as CT - 782 , for example — did have their numbers spoken , which matched their training armor . In the " StarWars " . com Databank , Echo is also identified as CT - 1409 , but this article assumes that CT - 21 - 0408 is also canon .