Blood Sisters " Blood Sisters " is the eighth episode of the " Star Wars Rebels " animated television series ' second season . It is the twenty - third episode of the series overall . The episode premiered on November 18 , 2015 on Disney XD . Official description . " While on mission to rendezvous with a courier holding secret information , Sabine encounters someone from her past : a bounty hunter named Ketsu . But is she friend or foe ? " Plot summary . On the planet Garel , Hera Syndulla sends out Vaux and a woman to pick up fighter parts in the market , just as Sabine Wren , Ezra Bridger and Chopper show up . Syndulla has a mission for Wren : there is a courier who has secret information , and she wants Wren to pick him up and transport him to Havoc Outpost . Syndulla says the information this courier is holding is very important , so it must be delivered . When Wren asks what this courier looks like , Syndulla has no clue , but knows he will respond to the given code phrase " It ’ s a long way to Alderaan . " With orders understood , Wren heads out to meet with the courier , with Bridger and Chopper as backup . On the way , Bridger speaks to Wren about how he sees her as a loner , because she usually handles her missions alone and prefers to be alone . As he goes on , Wren spots a marking she appears to recognize painted on a wall , looking concerned . She then regroups with Bridger and Chopper , and the three of them make it to the hangar where they are to meet the courier . As passengers depart arriving shuttles , Wren and Bridger try the code on each passenger and civilian that passes them . Nobody apparently responds to the phrase , and a few awkwardly walk away . Hours pass , the hangar is closing , and Wren and Bridger still have not found the courier . Finally , they discover the courier to be a GNK - series power droid called EG - 86 , who came in with the cargo payload . They also discover that someone else is after the courier , as well : a bounty hunter whom Wren identifies as Ketsu Onyo . Bridger learns that Wren and Onyo have a history together , as Onyo helped Wren escape from the Imperial Academy on Mandalore , and they then became bounty hunters . According to Wren , they had plans to join the criminal syndicate known as the Black Sun , but Onyo got greedy and left her for dead while she alone became part of Black Sun . Onyo tells Wren she would have been better off dead than joining the rebellion . She didn ' t believe that Wren had joined until she learned that the Empire had put a bounty on her . However , Onyo doesn ' t intend to collect on it , as her main priority is the courier . Wren warns Onyo that she won ’ t let her take him , and just before the two are tempted to take on one another they are interrupted by stormtrooper s . The lead stormtrooper reminds them the hangar is closed and instructs them to leave , and Onyo responds by shooting at them , and a gunfight occurs . As more troopers show up , Bridger instructs Chopper to get EG - 86 aboard a nearby shuttle while he , Wren and Onyo hold off the stormtroopers . As soon as the droids are on board , Bridger and Wren join them . Chopper shuts down the pilot droid and Wren powers up the engines . But as they take off , Bridger falls overboard when a shot from one of the stormtroopers strikes the shuttle door , causing him to lose his balance . As the shuttle departs , he contacts Syndulla and informs her that the mission has gone " high profile " . Meanwhile , the stormtroopers surround Onyo and hold her at gunpoint . After they order her to drop her weapons , Onyo suddenly attacks and takes out the troopers in hand - to - hand combat . She then retreats , using a departing shuttle as a stepping stone onto the roof where her ship , the " Shadow Caster " , is waiting . Wren and Chopper are now out in space , and despite leaving Bridger behind , they proceed with the mission in getting EG - 86 to the rendezvous point . Just before making the jump to hyperspace , they detect Onyo ’ s ship approaching . She comes up from behind and opens fire on the shuttle , knocking out their hyperdrive . Wren can guess what Onyo ’ s next move will be , and orders both droids to lock their feet down . Onyo comes up beside Wren ’ s shuttle and shoots the side door open , causing a hull breach . Chopper gets sucked into the vacuum of space , as EG - 86 and Wren get trapped in the doorway . With a bit of a struggle , Wren manages to activate the force field , sealing the breach . Onyo pulls the " Shadow Caster " around so she ' s face to face with Wren ’ s shuttle and makes contact . She threatens to blow her up unless she surrenders the droid . Little does she know that Chopper , after a moment drifting in space , has landed on her ship and is sabotaging her weapons array . Wren sees this and keeps Onyo distracted long enough for Chopper to disable her main cannon . While Onyo expresses how proud she is to be part of the Black Sun , Wren only shows disgust for having once wanted that life , as she knows the Black Sun are slavers and assassins who don ’ t care about anything but body counts and quotas . They will also kill their own for a profit . After Wren again refuses to hand over the droid , Onyo regretfully opens fire on her old friend , but thanks to Chopper the guns are disabled . Wren bids her farewell and hits the thrusters on her shuttle , with Chopper following . Onyo proceeds to captures him in a tractor beam and hold him hostage . Wren turns back and docks with the " Shadow Caster " , agreeing to make a trade . Meeting face to face , Onyo can see that Wren is still not willing to give up the courier . Onyo offers to split the bounty with her if she hands over the droid , but Wren tells her she is no longer into making profits as she now part of the rebellion ' s fight against the Empire . Onyo shows little confidence that the rebellion can overthrow the Empire , and tells Wren it ’ s foolish to even try . To her , survival is what really matters and people cannot be trusted . Wren tells Onyo the rebellion gave her a second chance in life . Back when she was only out for herself , she met good people who helped her become more than what she used to be and fight for the right cause . She forgives Onyo for abandoning her and offers her a second chance . Just then , they receive a transmission from an approaching " Arquitens " - class command cruiser that has been tracking down the stolen shuttle , which threatens to open fire if they try to flee . This issue forces Wren and Onyo to work together once again . As the Imperial vessel approaches , Wren has a plan , instructing Chopper to overload the hyperdrive on the shuttle . She then contacts the Imperial vessel , warning them that their ships have suffered severe damage and are in danger of self - destruction . The Imperials scan and confirm Wren ’ s report . The commanding officer gives them two minutes to stabilize the situation before moving in to dock . Onyo begins to see what Wren ’ s plan is . She ’ s going to blow up the shuttle , giving them the time they need to escape . Using explosives stored on the " Shadow Caster " , Wren plants them all over the shuttle ready to blow . She then reactivates the pilot droid and instructs him to activate the emergency protocols before retreating to the " Shadow Caster " . The Imperials notice the shuttle is powering up , and begin to open fire . They hit the docking tube , and Wren is knocked out by the blast . Onyo is prepared to make a getaway , but the droids refuse to leave Wren behind . Two against one , Onyo rescues Wren as the shuttle attempts to rip away from the docking with the " Shadow Caster " . Finally , everyone is aboard , and the " Shadow Caster " detaches from the shuttle , but both ships get caught in the Imperial cruiser ’ s tractor beam . The explosives aboard the shuttle then go off , destroying it and severely damaging the Imperial cruiser . The " Shadow Caster " , free of the tractor beam , escapes into hyperspace . Wren , Onyo and Chopper arrive at Havoc Outpost to deliver EG - 86 into safe custody . They are greeted by several Alderaan ian rebels , including the astromech droid R2 - D2 . Then they return to Garel and land , where Syndulla and Bridger are waiting for them . Syndulla congratulates Wren on a successful mission and thanks Onyo for her assistance . Before going their separate ways , Wren thanks Onyo for saving her and tells her if she ever thinks about helping the rebellion she will be welcomed . After shaking on it , Onyo boards her ship and departs as Wren and Bridger watch .