Unforgettable ( episode ) Chakotay meets a woman who claims that they fell in love a few weeks before , although he doesn ' t remember her anymore . Summary . Teaser . When the is searching for deuterium , they are suddenly hit with proton particle charges . They find it is a battle between cloaked ships and when one of them is destroyed , the female pilot of the remaining ship hail s " Voyager " asks for Chakotay by name , much to his surprise . Act One . As her ship begins to destabilize , Ensign Kim attempts to beam her aboard but he cannot get a solid lock . As a result , an away team consisting of Tuvok , Tom Paris , and Chakotay are sent over to stabilize the ship . Commander Chakotay soon finds the pilot and after getting her out from under some wreckage of a bulkhead , beams her to sickbay . The Doctor is perplexed that when she is scanned , the data disappears instantly . Fortunately , his visual diagnosis says she ' ll recover from her injuries . Upon regaining consciousness , she asks for asylum , which Captain Kathryn Janeway grants . When she is alone with Chakotay , she explains why she cannot be scanned and none of them can remember her : her species emits a pheromone which blocks memory cells and repulses technological scans . She says her name is and she is a Ramuran , a member of a race whose society is closed and does not allow anyone to leave their homeworld . It was her job to track down a member of her society who had run away and happened to be hiding on " Voyager " . She found them and after she left , a computer virus wiped all traces of her time aboard the ship . She came back to request asylum from the others of her race because she fell in love with Chakotay . Act Two . During Chakotay ' s briefing of the senior officer s , everyone , especially Chakotay , is skeptical of her story . Ensign Kim and Lieutenant Commander Tuvok attempt to search for physical evidence of the virus that was used to wipe any references to her first visit in the ship ' s computer and Lieutenant Paris will review the navigational logs . In the astrometrics lab , Tuvok and Seven review the data with Kellin . The navigation logs corroborate the story , but Tuvok wants to rule out tampering . Kellin accepts that and asks that they run a diagnostic on the logs , respecting both of their logic and skepticism as she had learned previously . Chakotay interrupts them to have lunch with Kellin in the mess hall . There , she tells him the story of how they met . She was a tracer , a security operative who tracked down members of her species who try to leave their homeworld . One such runaway was hiding on " Voyager " , and her mission was to find him , wipe his memory and take him home . After two days , she lost her cloak , and was discovered by Chakotay . She explained the situation and he agreed to help her find the stowaway . Suddenly , two more cloaked ships attack " Voyager " . Act Three . On Chakotay ' s recommendation , Janeway decides to trust Kellin with the ship ' s sensor s , and she manages to get " Voyager " to detect them . Fortunately , " Voyager " disables their weapons and they retreat . Kellin then offers to make the sensor modifications permanent . In order for her to complete them , she needs a command level officer , according to protocol , to assist with the command overrides . Chakotay goes with her . The modifications go well but Chakotay finds he can ' t sleep . He explains to Neelix in the mess hall later that he is bothered by his lack of memory and feels he cannot trust her . If it is a deception , it is a very personal one . Neelix suggests to Chakotay that it ' s his own feelings that he doesn ' t trust . Neelix leaves Chakotay alone to ponder this . Later that night , she visits him in his quarters . He admits he believes her story but isn ' t sure about the feelings he had . She presses him for how he feels , since it was him that brought her back and it is her presence continually endangering the ship . When so pressed , Chakotay says he doesn ' t want her to leave . Act Four . They end up talking all night in his quarters . She tells him about the last day they spent together . She recounts how they caught her fugitive through a clever trick using a magneton sweep , and then , since he wouldn ' t remember her , she kissed him . That ' s when she knew he felt the same way about her as she felt about him . Since she demonstrates as part of her story , he kisses back . The next day , Chakotay talks to Tuvok about finding a place for her , security being the best option . Tuvok , after a rare joke in which she would fit in as an assistant to Neelix , agrees to have her observe on his team . He then recommends she help Kim and Seven of Nine develop a defense against the proton weapons . There , Kim suggests scattering the proton beams a little using the baryon sensor s and the deflector and asks Kellin to review it . He also heard about her serving with Tuvok , and , in a welcoming gesture , says she should request beta squad . After she leaves , Seven takes the opportunity to comment on humanoid mating rituals , finding them unnecessary . Kim tries , but is unable to explain the necessity . Unfortunately another tracer , Curneth , catches Kellin later that day in Chakotay ' s quarters and uses a neurolytic emitter to partially erase her memories before Chakotay can stop him . Kellin then falls unconscious in his arms . Act Five . In sickbay , The Doctor finds there ' s nothing he can do about the memory loss . Kellin pleads with Chakotay not to let it happen , but there doesn ' t seem to be a way to reverse the effects . She then asks him to remind her why she ' s there and he promises to do more than that . Chakotay goes to the brig and questions Curneth about how the emitter works . He doesn ' t know and says he wouldn ' t help him if he did . He then orders the security guard to lower the force field , enters the brig and becomes angry with Curneth , almost beating him up due to his anger . However , he manages to channel his anger into an attempt to talk him out of returning her but it doesn ' t work very well . Curneth ' s position is too well rooted in his traditions . So instead , he tries to tell Kellin her own story , that she is in love with him . This time , she finds him attractive but his story still unlikely . He goes on and on , explaining his love for her just like she told him . She cannot see the point of staying to find out what was there and she feels responsiblity to her people . She does , at least , admit she wishes they had met under different circumstances . Since she will not stay , he has no choice but to release her to Curneth . Curneth also plants a computer virus to wipe all reference to either of them and they are beamed back to their ship . In the mess hall , Chakotay tries to write down everything he can on paper , once again at night . He tells Neelix that he can ' t understand why Kellin didn ' t fall in love twice like he did . Neelix explains that love is a mystery , and that if he knew the answer , then love would have lost its power . Memorable quotes . " " So . You ' re going to realign your sensors with Seven ' s . Sounds like fun . " " " " I know you want everything in a nutshell . That ' s the way you work . But I have to tell you the whole story before it will make sense . " " " " Fine . I ' m listening . " " " " I came back . . . because I fell in love with you . " " " " I thought you might like to get something to eat – unless your memories of our Mess Hall aren ' t good . " " " " As a matter of fact , I was quite fond of Neelix ' s food . " " " " Now , that ' s something that ' s hard to believe . " " " " Can I have your pudding ? " " " " Basically , she was a security operative for her people . She is a trained expert in weaponry , surveillance fighting skills . Any idea where she might fit in ? " " " " Mr . Neelix could use an assistant in the Mess Hall . " " " " Commander , I don ' t think you can analyze love . It ' s the greatest mystery of all . No one knows why it happens , or doesn ' t . Love is a chance combination of elements . Any one thing might be enough to keep it from igniting . Mood , glance , remark . And if we could define love , predict it , it would probably lose its power . " " Links and references . References . almond pudding ; Alpha Quadrant ; baryon sensor ; beta squad ; butter ; brig ; Bussard collector ; carrot ; champagne ; cloaking device ; compound fracture ; computer virus ; concussion ; deuterium ; evasive maneuvers ; fried soy meal ; herbal tea ; ice cream ; Jefferies tube ; logic ; magneton sweep ; memory center ; memory wipe ; Mikah ; milk ; needle ; neurolytic emitter ; pheromone ; polarization cloak ; procreation ; proton beam ; pudding ; Ramura ; Ramuran ; Ramuran vessel ; red alert ; tea ; tibia ; tracer