Fire Across the Galaxy " Fire Across the Galaxy " is the fifteenth and final episode of the first season of " Star Wars Rebels " . It is the fifteenth episode of the series overall . The episode , written by Simon Kinberg and directed by Dave Filoni , premiered on Disney XD on March 2 , 2015 . The episode continues the events of " Call to Action " and " Rebel Resolve , " with the rebels on a mission to rescue their leader , Kanan Jarrus , from the Galactic Empire . A battle takes place between the Empire and rebel forces above Mustafar , Darth Vader and Bail Organa return , Kanan faces the Inquisitor one last time , and Fulcrum ' s identity is revealed as former Padawan Ahsoka Tano . Official description . " The " Ghost " crew makes a final desperate attempt to rescue Kanan from the Empire . Who will fall ? " Plot summary . On Lothal , Sabine , Zeb , and Ezra sabotaged an imperial complex and destroyed several parked TIE / ln space superiority starfighter s , along with stealing an Imperial transport . Back on board the " Ghost " , the crew discussed how to infiltrate the " Sovereign " and rescue Kanan , who was imprisoned there and was being torture d by the Grand Inquisitor for the location of other Rebel cells and the real identity of " Fulcrum . " The rest of the crew decided to use the TIE fighter stolen by Ezra and Zeb and fill it full of EMP grenades , to take out the ship ' s power then dock their stolen transport with the ship to enter . Meanwhile , the Inquisitor taunted Kanan with memories of his master ' s death during Order 66 . The rebels successfully infiltrated Grand Moff Tarkin ' s Star Destroyer , but their sabotage elicited a swift response from Tarkin , who ordered stormtroopers from adjacent Star Destroyers to board the " Sovereign " . Chased by stormtroopers , Ezra was forced to separate from the crew to rescue Kanan alone . The rest of the crew attempted to get off the " Sovereign " . On board the stolen transport , Chopper called " Fulcrum " for help . Ezra rescued Kanan from his cell , but they were stopped by the Inquisitor in the ship ' s reactor core room , and a fierce duel ensued between Kanan and the Inquisitor . While caught in a crossblade , Ezra joined the fight with Kanan ' s lightsaber ( his own being borrowed by Kanan for the duel ) that was attached to the Inquisitor ' s belt . After briefly disarming Kanan , the Inquisitor hurled his lightsaber at Ezra , knocking him off of the platform , unconscious . Kanan , initially shocked and dismayed by what he perceived to be the death of his Padawan , quickly recovered and dueled the Inquisitor with renewed focus . He destroyed the Grand Inquisitor ' s lightsaber and forced him to hang on the ledge of the platform . The discarded lightsaber fell into the " Sovereign " s reactor core , destroying it and setting off a chain reaction . The Inquisitor then warned Kanan that " there are things far worse than death " before letting go and allowing himself to fall to his doom . Ezra , who was not dead but briefly unconscious , reunited with a relieved Kanan . Hera , Zeb , and Sabine , having found their way back to the TIE fighter they used to infiltrate the " Sovereign , " escaped the Star Destroyer but were shocked to find that Chopper and their transport were nowhere in sight . Kanan and Ezra stole the Inquisitor ' s TIE Advanced and rejoined their comrades , who were now stranded in space without Chopper . Tarkin evacuated the " Sovereign " , which was rapidly falling apart . In the ensuing space battle , the crew of the " Ghost " recognized the futility of escape . At the last moment , Chopper returned with the transport , the " Ghost " , and three Corellian Corvettes . After the TIEs docked with the transport , the fleet escaped from the Imperial flotilla . Hera reunited with Kanan and they received a message from Bail Organa , who revealed that they are one of many cells fighting the Empire . " Fulcrum " descended from the dorsal turret of the " Ghost " and introduced herself as Ahsoka Tano . She mentioned a change of strategy . Tarkin arrived back on Lothal and met Agent Kallus , who told him of an imminent insurrection as people were perceiving the Empire to be weak and vulnerable . Tarkin assured Kallus that the Emperor has sent an alternative solution : Darth Vader .