Mission to Imdaar The Mission to Imdaar was an Alliance to Restore the Republic operation intended to steal a TIE Phantom in the hopes of developing a counter for the Galactic Empire ' s cloaking device technology . The mission . In an attempt to develop a counter for the Galactic Empire ' s new cloaking device technology , the Alliance to Restore the Republic planned to steal a TIE Phantom from the " Executor " - class Star Dreadnought " Terror " . Admiral Gial Ackbar dispatched Rookie One , escorted by Admiral Krane and Darnell Reggs , to rendezvous with Commander Ru Murleen on Imdaar , where the " Terror " was known to be headed . After leaving the Alliance Fleet , the three Rebel pilots were forced to fight their way through numerous TIE / IN interceptors in their BTL Y - wing starfighter s before reaching Ceti 597 , from where Rookie One proceeded alone . After flying his way through a defensive asteroid belt , he finally reached Imdaar . Rookie One met up with his old tutor , Ru Murleen and after reaching an Imperial space platform , they hijacked the Lambda - class T - 4a shuttle " Epsilon Four " . Posing as Stormtroopers , the two Rebels boarded and infiltrated the " Terror " but their cover was quickly exposed . After being inquired by a nosy Imperial officer , they ran away and had to fight their way to the hangar hoping to steal one of the Phantom ships . Reaching a dead end they had to pass through the sewers but even there , Stormtroopers and Remote s attempted to stop them . Darth Vader , who at that time was on the ship had sensed their presence , and ordered Admiral Sarn to terminate them . The two saboteurs however , managed to re - emerge in the hangar , while an Officer was scolding a Stormtrooper guard who was dozing off while on duty . Hijacking a TIE Phantom , they flew around the Dreadnought ' s interiors but the Imperials acted quickly to close the hangar doors and prevent their escape . Murleen altered her plan and took the ship through the superstructure to look for another way out — a search which eventually led them to the ship ' s main reactor . Realizing that they had the opportunity to destroy the " Terror " and its complement of TIE Phantoms , Rookie One targeted the reactor ' s beam focusers , causing it to go critical . The Rebels escaped in their stolen TIE as explosions began to erupt throughout the Super Star Destroyer while it was docked over Imdaar Alpha . As Murleen plotted a course to the rendezvous point , they came under attack from TIE Phantoms . With their escape route cut off , the Rebels were forced to turn around and head back towards the Terror . Murleen skimmed their TIE along the surface of the doomed Star Destroyer while Rookie One fought off waves of TIE Phantoms . Despite his best efforts , the situation was beginning to look bleak when Murleen finally discovered how to engage the cloaking device , hiding them from their pursuers . Lord Vader escaped the destruction of the " Terror " , but executed Admiral Sarn for his incompetence before leaving . All other hands on board were lost when the vessel exploded , damaging as well as revealing the cloaked TIE Phantom factory below . Seeing now where the Phantoms actually originated , and without having such orders , Ru Murleen flew their Phantom inside the facility . Reasoning that the Alliance didn ' t stand a chance if a force this massive were to be unleashed , the two agents began to wreak havoc inside the massive structure . The facility was destroyed when its reactor was damaged by the two Infiltrators and went critical . The blast completely destroyed all TIE Phantoms within , as well as several Star Destroyers in dock with the station ; Imdaar Alpha suffered catastrophic damage as a result of the blast , but the two Rebels fled with their prize . Aftermath . Escaping the destruction in his TIE Advanced x1 , Darth Vader was scolded by Emperor Palpatine for the ineffectiveness of his invisible fleet , but Vader was hardly discouraged . Indeed , after depriving the Imperial Navy of the whole retinue of TIE Phantoms and having one prototype to study and reverse - engineer , the two saboteurs arrived to their temporary base where Rookie One was congratulated by Admiral Krane . However , not much later , as per Imperial protocol , the TIE Phantom was self - destructed , ensuring that the Alliance would never gain access to its unique technology .