Fulcrum ( title ) Fulcrum was a title used by several Rebel informants in the years leading up to the Battle of Yavin . Former Jedi Padawan Ahsoka Tano proposed the idea , and was the most notable Fulcrum agent . Imperial Security Bureau Agent Alexsandr Kallus became another Fulcrum after becoming disillusioned with the Empire , and informed the rebellion that several Imperial cadet s at the elite Skystrike Academy wanted to defect to the rebels . Captain Cassian Andor of the Alliance to Restore the Republic was a Fulcrum recruitment agent in the Albarrio sector . Description . The title of Fulcrum was used by spies in the rebel network . Their purpose was to gather and distribute intelligence , and recruit new members to the rebel cause . Fulcrums were supposed to keep their identities as secret as possible , and to that aim , usually modulated their voices on their transmissions . They also used avatars when speaking via hologram . The most common avatar was that of the Fulcrum symbol , but Ahsoka Tano , the title ' s creator , was also known to use an avatar of a cloaked figure . Fulcrums were both agent s and commander s , as they investigated Imperial activity and gave missions to their subordinates , they also directed forces and oversaw associated cells . The use of Fulcrum as a single codename allowed for the confusion of Imperial intelligence operations if an individual agent was uncovered . History . Origins . Following the establishment of the Galactic Empire , the former Jedi Padawan and Order 66 survivor Ahsoka Tano took over Senator Bail Organa ' s intelligence network , which was part of the early rebel network . She adopted the codename Fulcrum , which later became the standard alias for other rebel operatives within the network . By 9 BBY , Tano and the other Fulcrums were using a symbol derived from her forehead markings . Most people did not know the significance of the symbol , but rebel pilot Miara Larte , who had once been rescued by Tano , did . She knew to keep the secret , however , even from her sister Kaeden , who had also known Tano . The Spectres . By 5 BBY , the Spectres rebel cell leader Hera Syndulla kept in touch with Fulcrum , who supplied her cell with information about Imperial targets . While Syndulla was somewhat privy to Fulcrum ' s true identity , although not her real name , she kept this information a secret from the rest of her team members , including the Mandalorian weapons expert Sabine Wren . Following an attack on an Imperial convoy , Wren demanded to know Fulcrum ' s identity and insisted on accompanying Syndulla on a supply mission to Fort Anaxes on the asteroid PM - 1203 . After the Spectres rescued the Imperial defector Tseebo from Lothal in 4 BBY , Syndulla arranged for him to be spirited away into hiding aboard one of Fulcrum ' s CR90 corvette s . Following the capture of the Spectres rebel and Jedi Padawan Kanan Jarrus , Fulcrum contacted Syndulla by hologram and counseled her not to rescue Jarrus in order to avoid exposing the rebellion ' s existence to the Empire . However , the Spectres persisted with their rescue mission , destroying Grand Moff Wilhuff Tarkin ' s Star Destroyer , the " Sovereign " , in the process . After the Spectres ' astromech droid Chopper contacted her , Fulcrum dispatched members of Phoenix Cell to rescue the rebels . It was also at this point that she finally chose to reveal herself to the rest of Syndulla ' s team , including her real name . Building a rebellion . Although Tano was presumed dead after her duel with Darth Vader on Malachor , her codename survived and was still in use by several other rebel spies and operatives , including the disillusioned Imperial Security Bureau Agent Alexsandr Kallus and the Rebel Alliance recruiting agent Cassian Andor . Another rebel recruiting agent , former Partisan Xosad Hozem , knew of the Fulcrum agents , and upon encountering fellow ex - Partisan Jyn Erso , attempted to discern if she was aware of them . As Erso had never heard of the Fulcrums , she did not know what he was talking about . In 2 BBY , Kallus used his Fulcrum pseudonym to inform Phoenix Squadron about the presence of Imperial cadet s seeking to defect to the rebellion at Skystrike Academy . As a result , Wren mounted a rescue mission and managed to recruit the starfighter pilot s Wedge Antilles and Derek Klivian . During the mission , Kallus actively helped the trio escape from the academy by telling them which levels to avoid and which hangar bay they could get a ship from . When Wren , not suspecting that he was their new Fulcrum , demanded to know why they should trust him , he simply told her to " Tell Garazeb Orrelios , we ' re even . " Orrelios , a member of the Spectres , had unwittingly gotten Kallus to reconsider his allegiance to the Empire after saving his life during an incident with an escape pod on the Geonosian moon Bahryn . Kallus later tipped off Phoenix Squadron that the Empire was planning to place the planet Mykapo under martial law , prompting the rebels , including the Spectres , to go there to evacuate all of the rebels and rebel sympathizers . Some time after , when Bridger , Jarrus , and Chopper undertook an undercover mission to infiltrate and steal plans for Grand Admiral Thrawn ' s TIE Defender initiative , the rebels were aided by Kallus . He identified himself as a Fulcrum operative using the code phrase " by the light of Lothal ' s moon s " , and helped the rebels escape with the plans . After studying the rebel infiltration , Thrawn realized that the Empire had a spy within their ranks who was leaking information to the rebels . Due to their many past encounters with Kallus , most of the Spectres were skeptical that his change of allegiance was genuine . Kallus later used his Fulcrum pseudonym to aid the Phoenix rebels by leaking intelligence about Thrawn ' s E - XD infiltrator droid s . Using this information , the rebels Orrelios , Chopper , and AP - 5 overpowered EXD - 9 before it could reveal Chopper Base ' s location to the Empire . They then reprogrammed the droid into an improvised warhead and used it to destroy a Star Destroyer . Fulcrum later contacted the Spectres to thank them for their creativity in tackling the infiltrator droid s . However , Thrawn was able to use this incident to narrow down his search for Phoenix Squadron ' s base to 94 systems . Afterwards , Thrawn and Governor Arihnda Pryce intercepted one of Kallus ' Fulcrum transmissions and realized that Fulcrum was the code name of the mole in the Lothal sector command staff . They monitored his next transmission to learn his identity . Because only a highly - ranked Imperial could access the classified information Kallus sent in the transmission , they realized that the Fulcrum in the Lothal sector was not only a spy for the rebel network , but also a traitor to the Empire as well , and solicited the help of the head of the ISB Colonel Wullf Yularen in hunting down and identifying Fulcrum by screening staff from Sector Command . Thrawn and Yularen believed that the spy was an Imperial officer who was highly placed enough to have had access to classified information , and low enough to send his transmissions to the rebel network without the Empire ' s knowledge . After learning that Thrawn was monitoring Fulcrum ' s transmissions , the Spectres mounted a mission to rescue Kallus . During the course of the mission , the rebels also deleted Atollon from Thrawn ' s star chart . Kallus managed to stall the investigation by implicating Lieutenant Yogar Lyste as Fulcrum . However , Thrawn privately deduced that Kallus was actually Fulcrum because he had concealed the arrest of Bridger . The Grand Admiral decided to keep this secret , as he felt that Kallus would be more useful as a spy than he ever was when he was still loyal . On the eve of Phoenix Cell ' s long - planned attack on Lothal ' s Imperial factories , Thrawn arrived on the planet to warn Pryce of the impending attack . Kallus , who was not invited to the meeting , used a mouse droid to spy on Thrawn from the ventilation system . At the meeting , Thrawn informed Pryce , Admiral Kassius Konstantine and Grand Moff Wilhuff Tarkin , who was attending by hologram , of the impending attack and that Phoenix Squadron was being reinforced by the fleet of General Jan Dodonna . Via the mouse droid , Kallus overheard everything , and set out for an old communications tower outside of Lothal City . When he tried to transmit a message , he found that his signal was being blocked , and was shortly ambushed by Thrawn . Kallus managed to destroy the Grand Admiral ' s jammer , letting the partial message be sent , before Thrawn and his death trooper s arrested him . Thrawn explained to Kallus that the rogue agent ' s message was the final piece of the puzzle he needed to locate the rebel base , as its trajectory intersected with that of Dodonna ' s fleet . The art of the ancient people of the Lothal sector showed a star system at those coordinates , which was not on Imperial charts . At Chopper Base on Atollon , the rebel commanders received Fulcrum ' s warning in enough time for them to place all personnel on alert before the arrival of the Seventh Fleet . During the battle that followed , Kallus was held prisoner on the bridge of the " Chimaera " and forced to watch . After the rebels were forced to retreat back to the planet , and the orbital bombardment that followed , Thrawn left Pryce in charge of the fleet while he led a ground assault . One of the rebel ships , Bridger ' s " Gauntlet " , had escaped during the initial attack , and returned with reinforcements to destroy the Imperial fleet ' s remaining Interdictor , the other having been destroyed during the first stage of the battle . As the remaining rebel ships raced towards the blockade , Kallus took advantage of Pryce ' s reaction to the second Interdictor ' s destruction to taunt her about the mess she was making of Thrawn ' s fleet , causing her to order him thrown out of the airlock . He neutralized his stormtrooper guards in the turbolift and escaped the " Chimaera " in an escape pod , transmitting his coordinates to the " Ghost " , which picked him up before the remaining rebels escaped into hyperspace . Behind the scenes . The Fulcrum title first appeared in " Out of Darkness " , a first - season episode of " Star Wars Rebels " . Ahsoka Tano was not revealed to be the person behind it until the first season finale , " Fire Across the Galaxy " . The novel " Ahsoka " revealed the circumstances under which she created the title . The third - season " Rebels " episode " The Antilles Extraction " , meanwhile , revealed that the title had come to be used by multiple agents .