The Lost Commanders " The Lost Commanders " is the third episode of the second season of the animated television series " Star Wars Rebels " and the first episode after its premiere TV movie , " " . It is the eighteenth episode of the series overall . After premiering at on October 8 , 2015 , it aired on Disney XD on October 14 , 2015 . The episode features the return of the clone trooper s CT - 7567 ( " Rex " ) , CC - 3636 ( " Wolffe " ) , and CC - 5576 - 39 ( " Gregor " ) from the . Official description . " Ahsoka Tano sends the " Ghost " crew to Seelos in search of an old friend - - one whose leadership and strategy skills could help the fledgling rebellion . But will this legendary commander be willing to join the fight ? " Plot summary . Not long after the destruction of " Phoenix Home " , the Phoenix Cell that was commanded by Commander Jun Sato and Ahsoka Tano and the Spectres were on the run from the Empire . While the rebels discussed their next move , Ezra suggested the fleet seek shelter on a remote system . In response , Ahsoka suggested that the rebel crew of the " Ghost " seek out an old friend . Ahsoka gave Sabine and the crew of the " Ghost " the head of an old tactical droid and sent them to the Seelos system . Before leaving , she instructed Kanan Jarrus to trust her friend . The " Ghost " jumped through hyperspace to arrive at the Seelos system but the ship ' s systems were damaged upon re - entering realspace . Hera Syndulla stayed behind with Chopper to repair the ship while the rest of the crew searched the planet Seelos ' surface for Ahsoka ' s friend aboard the " Phantom " , the " Ghost " auxiliary shuttle . Sabine repaired the tactical droid ' s head , which began to chant " 7 - 5 - 6 - 7 " repeatedly . In the distance , the crew spotted a walker and flew towards it . As they approached the heavily - modified AT - TE walker , Kanan was overcome with foreboding . The crew disembarked from the " Phantom " and met three old men who emerged from the walker . Kanan recognized them as clone trooper s and ignited his lightsaber , prompting Wolffe to exchange shots with the Jedi with his rifle . Rex immediately broke up the fight between his comrades and Kanan before things could escalate further . Ezra than informed the clones that they had been sent by Ahsoka , whose name Rex recognized . Rex introduces himself and his comrades Wolffe and Gregor . Inside the walker , Ezra tried to convince Rex to join their fight against the Empire . Rex laughingly refuses , stating that his life as a soldier was over . Kanan , who mistrusted the clones due to his experiences during the Jedi Purge , wanted to acquire intelligence regarding locations for the Rebel fleet to seek shelter and leave . However , Rex convinced the crew to stay for a while longer . As Wolffe voiced his objections to helping the Rebels , Gregor invited the crew of the " Ghost " to join them in a hunt for joopa s as payment for this intelligence . Ezra , confused about Kanan ' s intransigence towards the clones , tried to convince Kanan to trust the clones . Kanan painfully recounted the events of Order 66 , when his clone trooper comrades suddenly turned on his master Depa Billaba and himself . Rex overheard the conversation and emphasized that not all clones executed the order . He assured Kanan that he , Wolffe , and Gregor had already removed their control chip s . Later , Kanan contacted Hera and confided about his distrust of the clones . Hera reassured Kanan that not all of the clones were bad and stressed that they had saved millions of lives , including hers . On board Admiral Konstatine ' s Star Destroyer " Relentless " , the Imperial Security Bureau Agent Kallus ordered the crew to dispatch a probe droid to investigate a coded transmission originating from the planet Seelos . Despite misgivings about the sanity of the clone source , Kallus still decided to investigate the lead . Back on Seelos , Garazeb Orrelios led the hunt for the elusive joopa with the AT - TE in tow . As the sound of a joopa drew closer , Gregor laughingly revealed that Zeb was the bait , much to the shock of Kanan , Ezra , and Sabine Wren . After the joopa swallowed up Zeb , the rebels and the clones work together to save Zeb and they succeeded in killing the joopa . Following the hunt , Kanan demanded that Rex honor his side of the bargain and supply the information so that they could leave . However , Rex convinced the rebels to stay for dinner . Sabine then entered the AT - TE ' s communications room and discovered that one of the clones had contacted the Empire and withheld information about Ahsoka . The rebels except Kanan were shocked by this revelation . Rex then confronted Wolffe , who regretfully admitted to alerting the Empire and hiding Ahsoka ' s communications because he wanted to protect his comrades from Imperial persecution for helping the Jedi . As Kanan ordered Sabine to contact Hera in the planet ' s orbit to scan for incoming Imperial ships , she discovered an Imperial probe droid in the process of sabotaging the " Phantom " . The probe droid managed to damage the ship ' s engines before being destroyed by Rex with a well - aimed blaster shot . Unfortunately , the " Phantom " was damaged by the probe droid , leaving the rebels stranded on Seelos . As the crew investigate the wreckage of the probe droid , they ponder an imminent attack by the Empire .