Mission to rescue Kallus In the year 2 BBY , Phoenix Cell launched a mission to rescue Agent Kallus from the Galactic Empire after learning that Grand Admiral Thrawn was close to uncovering his alternate identity as the rebel informant Fulcrum . As part of the mission , Ezra Bridger along with the droid s AP - 5 and Chopper stole a shuttle and allowed it to be captured by Lieutenant Yogar Lyste ' s " Arquitens " - class command cruiser . After Thrawn summoned Lieutenant Lyste and Agent Kallus for an audience aboard his Imperial Star Destroyer " Chimaera " , Kallus and the rebels worked together to prevent Thrawn from discovering the location of Chopper Base . In an effort to prevent Thrawn from discovering that he was Fulcrum , Kallus framed Lieutenant Lyste . After the rebels escaped , Thrawn and Colonel Wullf Yularen deduced that Kallus was indeed Fulcrum but kept this information secret in order to manipulate Kallus into helping them find the rebel base . Prelude . After encountering the Lasat rebel Garazeb Orrelios on Bahryn , the Imperial Security Bureau ( ISB ) Agent Kallus became a rebel sympathizer . Adopting the codename Fulcrum , Kallus aided the Phoenix Cell by leaking information about Imperial cadet s seeking to defect from the Skystrike Academy . Later , Kallus helped the rebels Ezra Bridger , Kanan Jarrus , and Chopper escape the Imperial Armory Complex with Grand Admiral Thrawn ' s TIE Defender initiative . As a result of these losses , Thrawn came to suspect that the rebellion had a mole within the Lothal Sector ' s Command staff . Later , Kallus leaked intelligence about Thrawn ' s E - XD infiltrator droid s to the rebels Zeb , Chopper , and AP - 5 , which led to the destruction of an Imperial Star Destroyer . Despite this setback , Thrawn managed to narrow down the search for the rebel base on Atollon to 94 worlds . Later , He and Pryce intercepted one of Kallus ' s Fulcrum transmissions and realized that Fulcrum is the mole the growing rebellion had in the Sector ' s Command staff and monitored Fulcrum ' s next transmission to learn his true identity . Because only a highly - ranked Imperialist could have access to the classified information Fulcrum sent to the Rebel Network in said transmission , Thrown and Pryce realized that Fulcrum was not only a spy for the growing rebellion but also a traitor to the Empire as well and enlisted Colonel Wullf Yularen ' s help in screening the Lothal Sector ' s Command staff in order to ferret out Fulcrum . The Spectres , who were monitoring Thrawn ' s activities , discovered that he was close to uncovering Fulcrum ' s true identity . As a result , Ezra along with Chopper and AP - 5 embarked on a mission to rescue Kallus . Their plan involved stealing a shuttle and allowing themselves to be captured by Kallus ' s " Arquitens " - class command cruiser ] , which was commanded by Lieutenant Yogar Lyste . The next stage of the plan involved Kanan and the former Clone Captain Rex flying a " Sentinel " - class landing craft to the Imperial light cruiser and pick them up . The mission . Behind Imperial lines . The rebels ' shuttle heist proceeded as planned and Ezra was captured by Yogar Lyste ' s stormtrooper s aboard his light cruiser . AP - 5 and Chopper managed to evade capture by claiming they were Imperial droids who had been unwilling passengers aboard Ezra ' s shuttle . While in a cell , Ezra revealed his mission to Kallus . Before they could escape the light cruiser , Lieutenant Lyste informed Agent Kallus that they had been summoned aboard Grand Admiral Thrawn ' s Imperial Star Destroyer " Chimaera " for a meeting . Seeking to regain the Empire ' s favor after an embarrassing incident involving the theft of three ships delivered to Lothal from Alderaan by Princess Leia on his watch , Lyste gave orders that Ezra , whom he mistakenly believed was a bounty hunter , be brought as a trophy aboard the " Chimaera " . AP - 5 and Chopper managed to convince Lieutenant Lyste to allow them aboard by claiming to have testimony against the bounty hunter . After boarding the " Chimaera " , Ezra was locked in a cell in Detention Block B7 . While AP - 5 and Chopper sent a transmission to Kanan and Rex warning them of their change in plans , Kallus and Lyste met with Thrawn and Colonel Yularen in Thrawn ' s Office , who informed them of their investigation into Fulcrum who they reveal is not only a spy supplying the Phoenix Squadron informant but also a traitor in the Imperial ranks . As part of the investigation , Yularen questioned several of the Sector Command staff . Kallus also learned that Thrawn was close to locating the rebel base on the planet Atollon . Following the meeting , Kallus embarked on a plan to mislead Thrawn into believing that Lieutenant Lyste was Fulcrum . He convinced the naive and inexperienced Imperial officer that Governor Arihnda Pryce was suspected of colluding with the rebels . While talking with Lyste , Kallus switched their code cylinder s . He then instructed Lyste to spy on Governor Pryce . Putting his plan into action , Kallus then freed Ezra from his cell and reunited with Chopper and AP - 5 , who needed a new set of clearance codes for Kanan and Rex to land on the " Chimaera " . Kallus and AP - 5 convinced Ezra to help them infiltrate Thrawn ' s Office in order to delete Atollon ' s location and to obtain the necessary clearance codes . Deflection and escape . Putting their plans into action , Kallus and his Rebel allies obtained an Imperial officer ' s uniform for Ezra . Ezra then used a Jedi mind trick to convince the stormtrooper sentry guarding Thrawn ' s Office that he was Lieutenant Lyste so that he could gain access to the room . Meanwhile , Thrawn along with Governor Pryce and Colonel Yularen visited Ezra ' s cell only to discover that the prisoner had escaped . Yularen also found Lyste ' s code cylinder was the last one used to open the cell , leading the Imperials to believing that Lyste was the traitor . Back in Thrawn ' s office , Kallus deleted Atollon ' s location from Thrawn ' s star chart while Chopper obtained the clearance codes . Thrawn returned to his office before the rebels and Kallus could escape . In order to create a distraction , Kallus set the Grand Admiral ' s Imperial sentry droid s to assassinate Thrawn . While Thrawn and his stormtroopers grappled with the rogue sentry droids , the rebels and Kallus made their escape . Thrawn managed to defeat the sentry droids by blasting them and caught a glimpse of Ezra fleeing the room , mistaking him for Lieutenant Lyste . Believing Lyste was indeed Fulcrum , Thrawn contacted Yularen and instructed him and Governor Pryce to head towards the hangar . By that stage , Rex and Kanan , who were disguised as stormtroopers , had managed to land their shuttle aboard the " Chimaera " . Realizing that the two visiting stormtroopers were rebel infiltrators , Governor Pryce tried to arrest them but Kanan and Rex fought back . Kallus and his rebel allies managed to reach the hangar where they were joined by an unwary Lieutenant Lyste . Lyste stun ned Governor Pryce and tried to help the stormtroopers only to discover they were rebel infiltrators . Kallus then tackled Lyste to the ground while the rebels fled aboard the shuttle . At the last minute , Kallus decided not to flee because he believed that he could help the rebellion as an Imperial insider . Aftermath . When Colonel Yularen arrived , Kallus claimed that Lyste was the rebel spy . Despite Lyste ' s protests , he was led away . In public , Thrawn and Yularen accepted Kallus ' s explanation that Lyste was Fulcrum . Governor Pryce also needed little encouragement since she had been stunned by an unwary Lyste . After Kallus and Pryce had departed , Grand Admiral Thrawn and Colonel Yularen discussed their investigation into Lyste . Both men concluded that Lyste was innocent and that Kallus had framed him in order to cover up the fact that he was Fulcrum . Despite this development , Thrawn decided not to take action against Kallus in order to manipulate him into helping reveal the rebel base ' s location to the Empire . Behind the scenes . The mission to rescue Kallus serves as the plot for the " Star Wars Rebels " Season Three episode " Through Imperial Eyes " , which premiered on February 26 , 2017 .