Apocalypse Rising ( episode ) Sisko leads a commando team into Klingon headquarters in an attempt to expose the Changeling impersonating Gowron . ( " Season premiere " ) Summary . Teaser . Captain Benjamin Sisko and Lt . Commander Jadzia Dax return to Deep Space 9 narrowly fleeing the Klingon s in the . Due to the declaration of the war between the Klingon Empire and the Federation , Starfleet had summoned Captain Benjamin Sisko and Lt . Commander Jadzia Dax to Earth to discuss Odo ' s dire belief that Gowron , the Chancellor of the Klingon High Council , has been replaced by a Changeling and is pressing forth the war . Once back on board Deep Space 9 , Sisko informs Major Kira Nerys that Starfleet has given them a mission to infiltrate Klingon military headquarters on Ty ' Gokor and expose Gowron by any means necessary . Act One . Sisko looks for Odo in Quark ' s . Quark tells the captain that Odo is one " " depressed ex - changeling " " and tells Sisko that he will find him on the upper level . Sitting at his table , Odo is fascinated by the foaming bubbles in his drink . As a Changeling he had no interest in them . Now he finds eating and drinking to be comforting . Sisko asks him to join the mission and Odo recommends Deputy Yndar go instead of him . Sisko , however , does not want Yndar – he wants Odo . After some initial hesitance , Odo agrees . At the mission briefing in the wardroom , Chief O ' Brien , Lt . Commander Worf , Captain Sisko , and Odo have been selected to go undercover and infiltrate Ty ' Gokor . Worf informs Sisko that getting to Gowron will not be easy , as he is protected at all times by his personal security force , the " Yan - Isleth " – the Brotherhood of the Sword . Sisko has been equipped with modified polaron emitters and a mission to infiltrate Klingon military headquarters on Ty ' Gokor to expose Gowron to polaron radiation ; if he is a Changeling , exposure to the radiation will make it impossible for him to retain his humanoid shape and the changeling will revert to its natural gelatinous state . All four emitters have to be activated at once , and too much exposure to the radiation will kill a person . They can only activate it once . Kira points out that the real trouble will be getting the four to Ty ' Gokor unnoticed , to which Sisko replies he has a plan . Kira lures Gul Dukat to the space station to use his Bird - of - Prey , which Dukat had acquired recently . Expressing surprise at Kira ' s pregnancy , Dukat tells Kira that First Minister Shakaar is a lucky man . Kira informs Dukat that Shakaar is not the father – Chief O ' Brien is . Dukat stares in shock at Kira as they enter a turbolift to go to the Promenade . The two go into the station ' s infirmary and find O ' Brien , Odo , and Sisko surgically altered to look like Klingons . Act Two . Sisko , Odo , O ' Brien and Worf set course for Ty ' Gokor with Dukat in his Bird - of - Prey . En route , they confer with Dukat to make sure he prepares false identities for them , candidates for the Order of the Bat ' leth who are expected . Damar expresses his pessimism about the mission , and prefers a decisive orbital assault , but Sisko and O ' Brien of course remind him of the outcome they want of exposing Gowron . Dukat appreciates the audacity of the plan . Meanwhile , Bashir and Kira discuss some station matters in Sisko ' s office . Turning to her carrying the O ' Briens ' child , Bashir encourages her she is doing fine and will pull through nicely . Kira is also confident that the crew will return , reassuring Bashir . Worf turns to the task of coaching the other three in behaving like Klingons , and , while Sisko proves reasonably convincing by backhanding Worf , he was unaware that was a challenge to the death . Meanwhile O ' Brien , and especially Odo , fail miserably by lacking in the Klingon ' s stance and demeanor . Sisko needs to help Odo clear his head with what ' s happened to him recently . Just then , a Klingon Bird - of - Prey confronts them and demands visual contact . However , Dukat ' s holographic filter malfunctions due to the optronic relay becoming fused . Worf suggests that he talk the other captain down , but Dukat does not put much trust in Worf ' s ablility to lie and abruptly fires his ship ' s disruptors at the ship , totally destroying it . He quickly orders Damar to leave the area . With the filter off - line , Dukat feels he has no choice but to leave the DS9 officers on Ty ' Gokor and leave Klingon space . When Sisko protests , Dukat assures him that if he is successful , the war will be over and they won ' t need his ship to return – and if he fails , he won ' t need transport , since he ' ll very likely be executed as a spy and a saboteur . Beam ing into Ty ' Gokor , the group get underway . Act Three . The Order of the Bat ' leth ceremony is underway in the Hall of Warriors , with hundreds of drunken Klingon s intending to celebrate all night in anticipation of Gowron ' s arrival . Back on the station , Julian Bashir finds Jake Sisko looking over the promenade . Jake explains that the mood on the station is down because of the threat of the Klingons . Ops calls Bashir to the infirmary to tend to passengers from the starships and . They were ambushed by Klingons and took heavy casualties . Bashir reassures Jake that his dad will be okay before he leaves to tend the passengers . At the ceremony , Worf informs the crew that the celebrations are an endurance test , and that only those who can drink and celebrate for the whole night and remain conscious the following morning will be inducted into the Order . Waiting until morning to set up their emitters , the DS9 officers begrudgingly partake in the festivities in order to blend in . During the course of the night , Sisko demonstrates his combat skills on several of the Klingons , and takes the opportunity to assault a Klingon who had killed one of Sisko ' s former Starfleet Academy classmates , a Benzenite named Laporin ( though Sisko uses the excuse that the Klingon was in the way of the barrels of blood wine ) . By the following morning , Sisko and his crew are still coherent , thanks to an alcohol inhibitor provided by Bashir . When arrives , he starts to size up the candidates there , and Sisko fears he may recognize them . He gives him a " Qapla " ' , and Martok moves on . Since Gowron should certainly be arriving soon , the four begin setting up their emitters . Although Martok feels he recognizes O ' Brien , the Chief gets away with it by claiming to have fought at Mempa along with Martok during the Klingon Civil War , which satisfies his curiosity . O ' Brien is relieved and places his emitter . Odo has trouble , however , when another Klingon jovially interrupts him and he drops the emitter . Another Klingon picks it up , asking what it is . Act Four . Odo knocks down the drunken Klingon and asks for the emitter back without saying what it is . Fortunately , Worf interjects and saves him , explaining it is actually a Vulcan toy called a tinghamut , acquired during the Klingon ' s raid at the Archanis sector and snatches it back . Just then , Gowron enters . He addresses the crowd and starts with the first Klingon , H ' ta , while Odo looks to place his emitter . He finds a drunken Klingon standing in the spot where the emitter needs to be placed . This time though , Odo finds his courage and tosses the Klingon aside before placing the emitter . Sisko prepares to activate them , but is summoned by Gowron to join the Order of the Bat ' leth . Sisko accepts the commendation . As he turns , he begins to activate the emitters , when he is attacked from behind by Martok with a bat ' leth , who now recognizes him . Act Five . Thrown into a holding cell , Martok confronts the four . Sisko presses Martok in return , as he believes that Martok thinks that Gowron is a Changeling , as well . Martok doesn ' t hide his feelings and admits he has suspected Gowron . Then , he agrees to help the DS9 officers kill Gowron to prove the point , though strangely refuses the notion of challenging Gowron to a duel himself . As they fight their way back into the Hall of Warriors , Worf challenges Gowron to a fight to the death , while Martok holds Odo back from the others at gunpoint , strangely unwilling to trust him . Gowron allows the challenge , and they fight . When Martok wonders aloud why Sisko doesn ' t simply shoot Gowron , Odo asks Martok another question : Why didn ' t Gowron let his bodyguards kill Worf ? Because a true Klingon wouldn ' t just shoot someone – they put honor above all else . However , Changelings don ' t care about honor . Odo then concludes that Gowron isn ' t the Changeling – " Martok " is . Worf gains the upper hand on Gowron and shatters his " bat ' leth " , and just as he goes to make the killing blow , Odo and the Martok Changeling loudly brawl their way into the hall . Knocked to the ground , Odo exclaims " " Martok is the Changeling ! " " Exposed , the Martok Changeling begins to choke Odo with a tendril of his shapeshifting body , but he is blasted back by Sisko ' s disruptor . As the other Klingons see Martok for what he really is , they begin firing as well , resulting in the Changeling ' s death . With the dust settled , Gowron realizes that the Founder s had manipulated Odo to believe that he was a Changeling , hoping that Starfleet would try to eliminate him . With Gowron dead at the hands of Federation operatives , the Martok Changeling would be able to rule the Klingon Empire , escalating the wars with the Federation and the Cardassian Union , destroying both powers , destabilizing the Alpha Quadrant and leaving it wide open for a Dominion invasion . Sisko informs him that the best way to strike a blow against the Founders would be an immediate end to the war between the Federation and the Klingon Empire , but Gowron informs Sisko he can ' t if the Federation refuses to allow the Empire to annex what the Klingons have already captured , including Archanis . Sisko believes that the Federation won ' t agree , but , believes there ' s room for negotiation . Satisfied , Gowron decides to declare a cease fire , to convene the High Council , and to arrange for the DS9 officers to return home . Before they leave , Gowron compliments Odo , thanks Sisko for doing a great service to the Klingon Empire , then finally turns to Worf and promises him that he will regret not killing him when he had the chance and he will not get another . Back on the station , Bashir is restoring them to their original appearance . Sisko says , " " I can do without the ridges , but I kind of miss the fangs . " " Bashir offers to give Odo any face he likes , Human , Bajoran , Trill . Odo says his old face will do fine . Memorable quotes . " " Captain , you ' re just in time for happy hour . " " " " Do I look happy , Quark ? " " " " He ' s upstairs at his usual table . Just follow the black cloud . " " " " So let me get this straight , all we have to do is get past an enemy fleet , avoid a tachyon detection grid , beam into the middle of Klingon headquarters , and avoid The Brotherhood of The Sword , long enough to set these things up and activate them in front of Gowron ? " " " " What ' s the matter , Dukat ? Haven ' t you ever seen a Klingon before ? " " " " I am not interested in excuses . Are you a Klingon warrior or an Alverian dung beetle ? " " " " I really don ' t see the point . . . " " " " Do not look away from me ! I called you a dung beetle . " " " " I heard you . " " " " And what is your response ? " " " " You should have your eyes examined . " " " " Are you questioning the validity of my plan ? ! " " " " Very convincing , captain . But was it your intention to challenge me to a battle to the death ? " " " " No , not at all . " " " " Then next time , do not strike me with the back of your hand . Use your fist . " " " " Was that really necessary ? ! " " " " It was either that or trust in mister Worf ' s ability to lie . And frankly I have more faith in my weapons . " " " " It ' s not easy being funny wearing these teeth . " " " " Brag all you want ! But don ' t get between me and the bloodwine ! " " " " It ' s a pity it doesn ' t have any bubbles . " " " " Captain , you don ' t know how much I ' ve looked forward to killing you in battle . And now your foolishness has cheated me of that pleasure . " " " " Sorry to disappoint you . " " " " What ' re they doing ? Why doesn ' t Sisko just " shoot " him ? ! " " " " I have a better question - why isn ' t Gowron letting his bodyguards kill Worf ? I ' ll tell you why : Klingon honor , a concept you should be " very " familiar with . My people , on the other hand , don ' t care about honor . How did you put it : ' There will be no honorable combat , no formal challenges ? ' " Hardly " the words of a Klingon . Tell me , " general ' – " did Gowron destroy the polaron emitters . . . or did " you " ? " " ( Referring to her pregnancy ) " " But don ' t forget , this . . . is still your fault . " " " " My fault ? " " " " You performed the transfer from Keiko to me . " " " " After you volunteered . " " " " After you put the idea in my head . " " " " After you flew the runabout into the asteroid field . " " " " After you insisted we check on those anomalous bio - scans . " " " " That was " Keiko " . " " " " That ' s right . It was , but I ' d rather blame you . " " " " You know , I think I ' m actually beginning to like bloodwine . " " " " It ' s really not too bad . . . except for the taste . " " " " What is this ? " " " " It is your death ! " " " " You want to kill me , Worf ? You ' re welcome to try ! " " " " You should have killed me when you had the chance . I promise you will not get another . " " Links and references . References . 47 ; Academy wrestling team ; Alpha Quadrant ; Alverian dung beetle ; annexation ; anti - intoxicant ; Archanis IV ; ; asteroid field ; A ' trom ; Barot ; Bajoran ; Bajoran ale ; Bat ' leth ; Benzenite ; blood ; bloodwine ; bubble ; cease fire ; central computer system ; Changeling ; Constable ; ; Dominion ; Dominion cold war ; ; Dukat ' s Bird - of - Prey ; fang s ; Federation ; Federation - Klingon War ( 2372 - 73 ) ; Founder ; general ; Hall of Warriors ; happy hour ; House of Konjah ; holo - filter ; Human ; Kahmar ; kilometer ; Klingon ; Klingon Bird - of - Prey ; Klingon Empire ; Klingonese ; Klingon High Command ; Klingon High Council ; Kobor ; Kodrak ' s son ; Laporin ; litter ; ; meter ; Milky Way Galaxy ; motto ; ; optronic relay ; Order of the Bat ' leth ; photon torpedo ; polaron ; polaron emitter ; polaron radiation ; Promenade ; Quark ' s ; radiation poisoning ; raiding party ; ; runabout ; Rurik the Damned ; Shakaar Edon ; shock ; shore leave ; space station ; Starfleet ; Starfleet Academy ; Starfleet Command ; Starfleet Intelligence ; Starfleet Science ; tachyon detection grid ; targ ; Tellarite ; Tellarite helmsman ; " tinghamut " ; toast ; tooth ; Tora Ziyal ; Trill ; Ty ' Gokor ; Ty ' Gokor orbital facility ; Vilix ' pran ; ; ; Vilix ' pran ; Vilix ' pran ' s offspring ; Vulcan ; Yan - Isleth ; Yndar ; Zora Fel