Julian Bashir ( Changeling ) The Changeling Julian Bashir was a Changeling of the Founder s in the 24th century . In the 2370s , this Changeling was one of a handful of agent s tasked with destabilizing relationships between the larger organizations of the Alpha Quadrant . In 2373 , Julian Bashir was captured by the Dominion on Meezan IV and sent to Internment Camp 371 . This Founder took his place with the mission of helping Dominion forces travel to Cardassian space and hatching a plan to cripple Federation , Romulan and Klingon forces . It spent a month keeping up appearances before carrying it out , including playing dart s and racquetball with Miles O ' Brien . In the meantime , the Dominion had been negotiating incorporating the Cardassian Union , and had to move a fleet into the Alpha Quadrant . After the crew of Deep Space 9 planned to collapse the Bajoran wormhole with a phase - conjugate graviton beam perfected by the Trill Science Ministry , the Bashir - Changeling sabotage d the station ' s emitter array . This instead stabilized the wormhole and allowed the fleet through . Later , when Dukat promised to retake DS9 with the new forces , the Changeling attempted to destroy the Bajoran sun , thereby wiping out the combined Federation , Klingon and Romulan fleets gathered to do battle with the Dominion . It stole the runabout the and killed its crewmembers in order to modify it with an explosive device composing of trilithium , tekasite , and protomatter and fly it into the sun . It was , however , intercepted and killed by the before he could carry it out . ( ) Background information . Bashir had previously been impersonated by a Changeling who portrayed Krajensky in . In that episode , however , the real Bashir was missing for a matter of hours before his replacement was revealed to be a spy . Based on the fact that the real Bashir was not wearing the newer uniforms introduced in , we can deduce that he had been replaced by a Changeling since at least that episode . This means the Changeling performed surgery on Sisko in " Rapture " and tried to help save the Changeling infant in . On the other hand , it is also possible that it was acceptable to wear either uniform style during that transitional period , as was seen in the transitional period , indicating that he may have been captured " after " the aforementioned events . Furthermore , while it has been argued that is unlikely since all Starfleet officers stationed on DS9 since have been wearing the newer uniforms , the real Bashir clearly gave his whereabouts as being Meezan IV ( not DS9 ) at the time he was abducted . In response to the often proposed question , Ronald D . Moore commented " " It would ' ve been before " Rapture . " " The Bashir Changeling also appears in " The Badlands , Book Two " , which takes place just after the events of . " Star Trek " tie - in author , Christopher L . Bennett , proposed the following about the Changeling : " Indeed , the timeline doesn ' t really work out there . The uniform change was in " Rapture " , and Bashir was supposedly abducted 37 days before the end of . But there ' s no way that " Rapture , " , , , , and " By Inferno ' s Light " could ' ve all taken place within less than 37 days . According to dialogue , " Darkness " is at least three weeks before " The Begotten , " which in turn covers nearly 2 weeks . So that ' s at least 33 days right there , and the events of " For the Uniform " and the 2 - parter cover about a week each , plus however much time might have elapsed between them . ( Even if we assumed 26 - hour Bajoran days , 37 of those is only 40 Earth days , so that doesn ' t help . ) So Bashir must have been abducted after the uniform change ; there ' s simply no other possibility . The fact that he ' s in the old uniform is a paradox . " " On the other hand , it ' s stated in dialogue that Kirayoshi was born " less than a month " before " Purgatory . " Since the 2 - parter takes about a week , that pretty much requires that Bashir was abducted in between " The Darkness and the Light " and " The Begotten " . That part can ' t be finessed , since the dialogue is explicit . On the one hand , Bashir had to be abducted after the uniform change , which creates a plot hole ; but on the other hand , Kirayoshi had to be delivered by the changeling impostor , which creates a second plot hole . It ' s a total mess - - they just didn ' t think through the timeline carefully when they put in the date references . " " But as for this part ' Because if Changeling ! Bashir helped to deliver the baby in " The Begotten " , then he also did the ultra - delicate brain surgery on Sisko in " Rapture " . ' Since " Rapture " was significantly more than 37 days before the end of " Inferno , " that means it was the real Bashir who did that . "