Rejoined ( episode ) Dax is reunited with the Kahn symbiont , a wife of one of her previous hosts , and must decide whether or not to ignore Trill taboo and continue their relationship . Summary . Teaser . Jadzia Dax is in Quark ' s showing off magic tricks to Quark and Julian Bashir when Captain Benjamin Sisko calls her away . He informs her that a Trill science team is coming to create an artificial wormhole and that the leader of the team is Lenara Kahn . He then suggests that Dax has three months of leave accumulated and that she should take advantage of it . But Dax says she can handle it and that she has never allowed her past lives to interfere with her job . Dax , Worf , and Kira Nerys greets the science team comprised of Dr . Hanor Pren , Dr . Lenara Kahn , and her brother Dr . Bejal Otner . Dax and Kahn formally greet and both agree " it ' s been a long time " . Dax reveals to a curious Major Kira that Kahn used to be Dax ' s wife . Act One . In Quark ' s , Kira and Bashir explain to a confused Quark that Dax ' s previous host Torias was married to Kahn ' s previous host Nilani . However Torias was killed in a shuttle accident and Nilani became a widow . When Nilani died , the passed on to Lenara . Kira can not understand why Dax and Kahn can not simply " pick up where they left off " , but Bashir explains that it is strictly against the rules of Trill society to acknowledge it in any way . Rekindling a relationship with a love from a past life is called Reassociation , and the Trill feel it is unnatural as the point of joining is to allow the symbiont to accumulate experiences from many lifetimes . When moving from host to host , the symbiont must learn to let go of the past and move on from family and loved ones . Kira believes there must have been some Trill who have reassociated and there have : they were exile d from Trill society and their symbionts died with them . There is nothing more important for a joined Trill than to protect the life of the symbiont and therefore Bashir believes Dax will not act on any feelings she has . At the welcome reception for the Trill scientists , Dax and Kahn have an awkward encounter at the buffet table which is not helped by the inquisitive looks cast by everyone else in the room . Dax humorously suggests getting in a screaming match to entertain the audience . Kahn jokes that perhaps they could throw themselves at each other , profess their love and disregard for Trill society . Kahn adds that they are both mature adults who are capable of handling the situation and Dax agrees . However , when Kahn goes to the other side of the room , they exchange glances . Act Two . On the , the science team is going over the plan to generate a subspace tensor matrix with a magneton pulse to create an opening in the space - time continuum . Left alone on the bridge , Kahn and Dax discover a few problems , and Dax tells Kahn not to panic – Torias used to tell Nilani that she was making a fuss over nothing and panicking . Dax admits that Torias was insensitive but Nilani overreacted as well . Kahn replies defensively and accidentally in the first person , but what she meant to say was " " Torias being a pilot made Nilani nervous " " . Both hosts feel they have never had so much trouble separating their feelings from that of a past host . Dax adds that Torias was at fault for testing an unsafe shuttle and that the part of her that is Torias is very sorry . On impulse , Dax invites Kahn to dinner with her and Bashir , only it turns out that Dax nominated Bashir as a chaperon without asking first . Kahn agrees to meet that night at Quark ' s . It turns out Bashir had plans that night , but Dax insists he cancel them and he relents . The unfortunate Bashir sits at a table yawning , completely left out while Kahn and Dax reminisce the night away . Bashir gets called away by Ensign ' s broken leg and leaves a little too eagerly . Kahn thinks that Bashir is a good friend , listening to them trading stories and not complaining . Kahn gives Dax her pair of Klingon earrings and Dax reaches out to hold Kahn ' s hand , only to be observed by Dr . Pren . Act Three . On the " Defiant " , preliminary testing has begun . Pren reports to Dr . Otner about the former couples ' dinner date the previous night and observes they are very friendly towards each other . Otner prefers to focus on the experiment . Dax embraces Kahn as the first test succeeds : the wormhole was open for 23 . 4 seconds . While Otner and Kahn have dinner , Otner asks questions about Dax , who visited Kahn ' s quarters the previous night . Kahn becomes defensive and Otner states that people are starting to notice how Kahn and Dax are acting towards each other . Kahn storms off angrily and Otner apologizes . He agrees to trust her if she says that nothing is going on , and Lenara insists there is not . Kahn visits Dax ' s quarters considerably upset at the encounter with her brother . Dax suggests they should not see each other and they should not be having this conversation but Kahn says that would not change their feelings . Kahn admits that she has not gotten over Dax and Dax tells Kahn she has missed her so much . They share a passionate kiss and Kahn quickly leaves afterward . Act Four . Dax seeks Benjamin Sisko ' s advice regarding what to do . Sisko thinks Dax should not pursue the relationship as Curzon Dax had said that the price for violating the reassociation taboo is too high . Sisko wants Dax to think about what will happen if they reassocciate : when Jadzia dies , Dax dies . Sisko assures her that if he were in her position he would want to be certain that he can pay the price before doing anything . Sisko , however , agrees to back Dax if she is sure that this is what she wants . Dax says that in her seven lifetimes , she has never had a friend quite like Sisko . On the " Defiant " , the team reopens the artificial wormhole in preparation for their attempt to send something through it . The wormhole appears to be stable and a probe is launched , however the wormhole collapses as soon as the probe enters it sending out a shockwave which causes major damage to the " Defiant " , with a hull breach on Deck 5 and plasma leaks in the engine room where Dr . Kahn is located . The bridge cannot contact the engine room and Dax goes to investigate . Getting there with a damage control team , Dax finds a full - blown plasma fire in the middle of engineering that is threatening to cause a warp core breach . The compartment needs to be vented to put the fire out , however Kahn is lying out of reach and unconscious . Dax walks on a level 8 force field over the leaked plasma and gets to Kahn in just in time with the help of Michael Eddington . Dax and Khan crawl into an emergency compartment and engineering is vented , saving the ship . Kahn tells Dax that she does not want to lose her again and Dax agrees . Act Five . Dax visits the recovering Kahn and Otner thanks Dax for what she did . He leaves and gives them their privacy . Dax gives Kahn a bottle of Risian perfume and says that the accident may have been caused by the tetryon field ' s reaction to the probe ' s shielding , producing a massive graviton wave . Kahn feels guilty about the damage but Dax says it is a huge achievement . Dax then suggests Kahn do further research with her at Deep Space 9 instead of returning to and that she is prepared to pay the price . Dax says it does not matter what everyone else thinks , but what they feel is most important . Kahn however feels that she can not give up everything she worked for and ignore the rules , despite feeling that a part of her is missing without Dax . Kahn wants to think it over on Trill for a little longer , but Dax says that if Kahn leaves on the transport tomorrow they both know that she will probably never return . Worf escorts Pren and Otner to the airlock while Dax observes from above , still hoping Kahn will stay . However Kahn arrives soon after . She casts one last lingering look at Dax and the grief - stricken hosts part , possibly forever . Memorable quotes . " " She probably beamed the egg directly into her mouth from one of the transporters ! " " " " Ladies and gentlemen , the amazing Jadzia Dax ! " " " " You know that woman . " " " " I " know " her . She used to be my wife . " " " " For a joined Trill , nothing is more important than to protect the life of the symbiont . " Nothing . " " " What " do " Klingons dream about ? " " " " Things that would send cold chills down your spine , and wake you in the middle of the night . No , it is better that you do not know . Excuse me . " " " " I can never tell when he ' s joking . " " " " I ' m not like you , Dax . . . I don ' t have a little Curzon inside me telling me to be impulsive . . . to ignore the rules . . . give up everything I ' ve worked for . . . " " " " Can you really walk away from me . . . from us ? After all this time we ' re back together . Don ' t throw that away . " " " " I don ' t want to . . . Maybe I need more time . . . maybe if I go back to Trill for a while . . . think it over . . . I could always come back later . . . " " " " I wish I could believe you . But ultimately , it comes down to this . . . if you feel about me the way I feel about you . . . you won ' t get on that transport tomorrow . And if you do leave . . . I think we both know you ' re never coming back . " " Links and references . References . artificial wormhole ; AQF sequencer ; awning ; Bajoran cuisine ; Bajoran s ; Bajoran wormhole ; Barros Inn ; " bat ' leth " ; birthday party ; brother ; chaperone ; class - 4 probe ; crew quarters ; ; ; ; ; ; ; ; diagnostic subroutine ; dream ; dress uniform ; exile ; focal array ; force field ; graviton wave ; hasperat ; headache ; heart attack ; introvert ; Jefferies tube ; Kahn ( symbiont ) ; : kiss ; Klingon ; Klingon scientist ; latinum ; magneton pulse ; Milky Way Galaxy ; " moba " fruit ; neutrino ; nurse ; " Old Man " ; perfume ; plasma coil ; plasma fire ; plasma leak ; probe ; Promenade ; Quark ' s ; rabbit ; " ratana " tree ; RCS thruster ; reassociation ; Replimat ; Rigel system ; Risian scientist ; sister ; sleight - of - hand ; space - time continuum ; spouse ; strategic operations officer ; subspace field stress ; subspace tensor matrix ; target drone ; tea ; team leader ; tetryon ; theoretical quantum physics ; toast ; transtator ; Trill ; Trill homeworld ; Trill Science Ministry ; ; ; " veklava "