Unexpected ( episode ) When Trip Tucker assists an alien vessel with repairs , a " friendly " encounter with one of the crew leads to rather unexpected consequences . Summary . Teaser . A sudden wave of odd malfunctions are affecting , such as a gravity outage while Captain Archer is showering . Malcolm Reed informs Archer it will be temporary , and , indeed , it kicks back in before Archer can pull himself back to the floor . He falls hard . Act One . Malfunctions continue to affect multiple systems . During a buffet in which Doctor Phlox is encouraging T ' Pol to try Human food more , T ' Pol calmly disagrees and goes to get some carbonated water , only to find a thick sludge come out of the machine instead . In engineering , Commander Tucker receives more malfunction reports when Archer arrives for an update . He ' s isolated it to the plasma exhaust , but needs more time . Just then , a small explosion in the room halts the conversation . Archer and a crewman put it out , but it forces Tucker to order the ship to slow down to impulse , something he ' d rather not do since he thought he could figure it out . It is soon discovered that the malfunctions are caused by a cloak ed alien ship which is using " Enterprise " s plasma exhaust to replenish its teraphasic coil s because its own engines are malfunctioning . The aliens deeply regret the incident and Archer graciously offers to help them . Tucker is sent to the alien vessel to assist them with the repairs . With a few inoculations from Phlox , Tucker is excited to need to stay a few days on an alien ship for the assignment . Travis Mayweather easily brings Tucker over and docks with the ship . Tucker enters and climbs a long ladder into a small chamber . Oddly , the room starts to fill up with a gas that burns his lungs . He ' s alarmed , despite a voice calling in to say his discomfort will subside if he breathes normally . Act Two . At first , Tucker has an unpleasant experience as he adjusts to the ship ' s environment . During the three - hour decompression he calls Archer a few times . Then , he refuses to rest after , preferring to get a head start on the work . The aliens allow it , but he starts to feel nauseous and feverish . The feeling increases as he is led to the engine room . However , he finally accepts the suggestion ( and Archer ' s order ) to rest a little and begins to feel better soon afterward . In quarters prepared for him , the female Xyrillian engineer on board the ship , Ah ' len , helps Tucker recuperate , offering him the closest thing they have to water on the ship : small cubes . Tucker is also fascinated to see that they have grass and food growing all over the ship itself . After some time , Tucker helps the aliens with the engine and now enjoys himself . While coordinating with T ' Pol , he relates the fascinating things he ' s seen to her and the crew . When it comes to a point where they need to wait , Ah ' len shows him around the ship and introduces him to some interesting features of their technology : notably a kind of holodeck where various environments are simulated . She also plays some sort of a " game " with him whereby both reach into a pool of pebbles that enables them to read each other ' s minds . It is an interesting and enjoyable experience for Trip . When the coils come back online and thus the repairs are concluded , Trip finally returns back to the " Enterprise " , having thoroughly enjoyed his three - day trip . After the Xyrillian starship cordially leaves , Tucker discovers a strange growth on his lower arm while talking to Reed . He thinks it is an allergic reaction but , after being examined by Dr . Phlox , he learns that it is actually a nipple . Phlox scans him and informs him that he is pregnant . Act Three . Tucker goes through a thorough scan while Archer and T ' Pol are called to sickbay to hear the situation . Phlox states no genetic material is taken from the male involved and therefore Tucker is only serving as a host to the embryo . However , it ' s integrated with his pericardium , so Phlox is reluctant to remove it without more information . Then , Tucker is asked some rather uncomfortable questions by Archer and T ' Pol about his stay on board the alien vessel , as Phlox says there must have been some lengthy physical contact to transfer the genetic material . Tucker is emphatic that he was a " gentleman " the entire time , which prompts disbelief from T ' Pol , who expresses surprise that Tucker couldn ' t keep it together for three days . Tucker continues innocence , but then remembers the pebble " game " he played with the female engineer . The doctor tells him that apparently the " game " served to transfer genetic information to him . They realize that they have to find the Xyrillians to find information about the gestation process . While searching for the Xyrillian ship , a hormonal Trip finds himself irritated frequently . Later , Tucker is in engineering and becomes very concerned about the lift being dangerous to a child or a short alien , pulling a confused crewman Dillard aside to talk about it . Dillard expresses his concern and Tucker drops it in frustration . At dinner with Archer and Phlox , Tucker suspects that T ' Pol told everyone about his pregnancy , as he believes everyone is looking at him differently . Archer and Phlox try to calm him , but also remind him that they may not find the Xyrillians , meaning he will need to deliver the baby . Tucker ' s appetite seems to have increased , prompting Archer to order 8 - hour check - ups with Phlox . Finally , they discover the Xyrillians " hitchhiking " on a Klingon battle cruiser as they did with " Enterprise " . Act Four . Archer decides that they need the Klingon ' s cooperation since they will not be able to communicate with the Xyrillians without alerting them . This means a difficult explanation of the situation , as the Klingon captain , Vorok , is irate , firing on the ship first without answering the initial hail , then , after answering , immediately preparing to take the Xyrillians ' ship and execute the crew . Archer tries to entice them to stop , but is unsuccessful . T ' Pol then mentions Archer ' s experience with the Klingon chancellor , appealing to the honor and wisdom in heeding his request . Vorok then agrees . Archer also asks to allow Tucker to come with them to the ship , which is dismissed until they give the full explanation , including Tucker showing his now - protruding body to them ( to his embarrassment ) . The Klingon s find all this very amusing , and the captain decides not to destroy the Xyrillian ship if the Xyrillians promise to share some of their technology , in particular , the holographic technology . On the Xyrillians ' ship , the Klingons provide topographical data on their world and are amazed at the technology . The Xyrillians agree to adapt the technology . When Tucker is finally able to explain his situation to Ah ' len , she apologizes , saying she didn ' t know that was possible . After examination , she finally concludes that the embryo could safely be transferred to another host – it is also revealed that the embryo is a girl and is very healthy . As they depart , T ' Pol informs Tucker that he may be pleased to know that after some research she found that this is the first recorded incident of a Human male becoming pregnant ( the term again being misapplied even by their own definitions ) – " " just how I always wanted to get in the history books " " , Tucker responds . Log entries . " " Captain ' s starlog , supplemental . We ' ve spent eight days looking for the Xyrillian ship . But so far , we ' ve . . . had no luck . " " Memorable quotes . " " There ' s an old saying : ' When in Fellebia , do as the Fellebians do . ' " " " " It ' s difficult enough having to smell all of this . Eating it is out of the question . " " " " Three days on an alien ship . " " " " Remember to mind your manners . " " " " I feel like I ' ve , uh . . . got a fever . I ' m having trouble focusing , breathing . I really think I need to get back , captain ! " " " " I ' m not sure if congratulations are in order commander but , you ' re pregnant . " " " " Three days . You were only there for three days , and you couldn ' t restrain yourself . " " " " I ' m telling you , captain , I was a complete gentleman the entire time . " " " " I imagine that ' s a question of how " you " define ' gentleman ' " " " " Take a nap , Trip . That ' s an order . " " " " I ' m the chief engineer . I spent years earning that position . I never had any intention of becoming a working mother ! " " " " Tried these scrambled eggs ? Tastes just like the real thing today . " " " " Post - natal responsibilities ? " " " " You may be putting those nipples to work before you know it . " " " " I considered myself a diplomat from the minute I set foot on that vessel . Well . . . there was that box of pebbles . " " " " Pebbles ? " " " " One of the first things a diplomat learns is not to stick his fingers where they don ' t belong . " " " " You ' ll probably feel a bit nauseated in the mornings , so get sufficient rest and exercise and see me at least once a day . That nipple may not be the only surprise your body has in store for you . " " " " I can see my house from here ! " " " " If the starship profiles the Vulcans gave us are correct - " " " " They ' re correct , lieutenant . That ' s a Klingon battle cruiser . " " " " Perhaps a little lunch might help . I hear Chef has prepared Rigelian sausage . ( Tucker groans ) Being vegetarian I can ' t speak from experience , but I ' m told it ' s quite succulent . " " " " I ' ve run a check through the Starfleet database . You might be pleased to know that this is the first recorded incident of a Human male becoming pregnant . " " " " Just how I always wanted to get into the history books . " " Background information . Deleted scene 44 . On the season one DVD release of " " , there is one deleted scene which was removed from this episode . The number of the scene , 44 , indicates the scene ' s original place in the episode before being cut . The scene mostly takes place at the console in " Enterprise " s situation room and shows Tucker ( who is not feeling very well ) , T ' Pol , and Reed discussing whether or not they are actually tracking the stealth alien vessel . Tucker attempts to dismiss himself , only for T ' Pol to recommend a meal , revealing she has been told that Rigelian sausage , which has recently been prepared by the ship ' s , is notably " succulent . " Tucker replies that he plans to lie down for a while but , as he waits for the turbolift door to open , Reed comes up with a faster way to detect the alien ship ' s plasma trail – by modifying " Enterprise " s UV sensor s . He asks for the engineer ' s help to do so but Tucker , about to vomit , rushes to a door at the port side of the situation room , opens it and exits . A toilet is presumably on the other side of the door ; Tucker can then be heard to vomit . Links and references . References . Ah ' len ' s embryo ; Almack ; amputation ; artificial gravity ; bioscan ; blastocyst ; blueberry pancake s ; carbonated water catfish ; chef ; chicken tetrazzini ; civilian clothing ; dermal plate ; diet ; digestive tract ; drink dispenser ; dutara root ; exhaust port ; Fellebia ; Fellebian ; finger ; gestation ; hair follicle ; Hart ; hitchhiking ; holographic ; hologram ; inter - species reproduction ; Klaang ; Klingon s ; Klingon chancellor ; Klingon Empire ; Klingon High Council Chamber ; mirazine ; nap ; pericardium ; plasma exhaust ; " plomeek " broth ; resequenced photons ; polarized hull plating ; pregnancy ; Qo ' noS ; shave ; shore leave ; Starfleet database ; stealth ; " Sto - vo - kor " ; telepathy ; teraphasic coil s ; Thera ; topographical survey ; vegetarian ; visual simulator ; Vorok ' s battle cruiser ; Vulcan s ; ; water ; Xyrillian s ; Xyrillian homeworld ; Xyrillian starship Unreferenced material . D4 class ( concept ) ; Rigelian sausage ; vomiting