History Main / LoveInterestTraitor

* ''Series/{[Teen Wolf}}'' has this happen to Derek Hale, twice!

* A rare example of this being done with a ''male'' character is the VideoBrinquedo "spectacular" ''What's Up? Balloon to the Rescue'', in which the lead girl is infatuated with suave Frenchman (read: DevilInPlainSight EthnicScrappy) Jean-Pierre.

* [[spoiler: Penelope]] of the ''SlyCooper'' games. She betrays [[spoiler: Bentley]] due to his devotation to his friends over her, and becomes a major antagonist in the fourth game.

* In ''Series/{{Supernatural}}'', [[spoiler: Sam's love interest Ruby turns out to have been manipulating Sam into freeing Lucifer.]]

* ''Sisterhood'' series by FernMichaels: Starting with ''Final Justice'', Little Fish is set up to be a love interest for Countess Anne "Annie" Ryland de Silva and Stu Franklin is set up as a love interest for Isabelle Flanders. However, by ''Cross Roads'', both relationships are falling apart. The final blow comes when Little Fish and Stu Franklin are revealed to be CoDragons for BigBad Henry "Hank" Jellicoe - as well as cold-blooded murderers. Ouch!

* [[WhiteHairedPrettyBoy Kaworu]] [[EnigmaticMinion Nagisa]] in the original ''NeonGenesisEvangelion'' anime. Arrives to NERV HQ as a new pilot who immediately takes an interest in [[HurtingHero poor, depressed Shinji]] [[HopeSpot when everyone else had either died or become estranged from him]], turns out to be [[ApocalypseMaiden the final angel.]] He ultimately goes with the HeelFaceTurn option and performs a HeroicSacrifice to save both Shinji and humanity. Notable for being a same-sex example.

* In the 1966 {{Batman}} movie, Bruce falls in love with Kitka only to find out she's Catwoman (and definitely a villain in this incarnation).

* An episode of ''Series/{{Firefly}}'' has Mal being (unintentionally) married to a young woman for a reward. But she turns out to be a con artist, intent on killing the crew (by leaving them to die) and selling their ship.
** Her appearance in a later episode reveals this to be her standard operating procedure: seduce, steal, leave 'em for dead, repeat...

[[AC:Anime & Manga]]

[[AC:Film]]

* The infamous ''GarbagePailKidsMovie'' has the equally-infamous Tangerine (infamous because she looks about ten years older than her early-teens leading guy; the actors are a year apart in real life). Her loyalty turns out to be to a street gang, and the poor girl gets pooped and vomited on at the end of the movie by the title characters for it.
* ''WarriorsOfVirtue'' (also known as "that one with the ninja kangaroos") did this, too, with the girl joining up with the [[HamAndCheese hamalicious]] BigBad to avenge her brother, who had been accidentally killed by a kangaroo ninja. She's ultimately killed by her boss when she has a change of heart and helps the hero escape.

* This happened to varying degrees in all three of the ''ScoobyDoo'' movies that are generally considered "the good ones;" in fact, it may be part of the reason they're regarded so highly that they give the gang other characters to play off of:
** ''[[ScoobyDooOnZombieIsland Zombie Island]]'', the first, played it straight, with Fred developing feelings for a {{Moe}} Cajun chef named Lena, with hints dropped that she may like him, too. Nope, turns out she's a [[ReallySevenHundredYearsOld centuries-old]] [[NinjaPirateZombieRobot soul-devouring cat monster]]...
** ''[[WesternAnimation/ScoobyDooAndTheWitchsGhost Witch's Ghost]]'' had Velma's (again, implied to be mutual) crush on horror novelist [[strike:Creator/StephenKing]] Ben Ravencroft, who turns out to be using the gang in an attempt to free his EldritchAbomination ancestor (the title character).
** Finally, in ''[[WesternAnimation/ScoobyDooAndTheAlienInvaders Alien Invaders]]'', Shaggy's girlfriend Crystal isn't a traitor, exactly, but she is connected to the film's haunting; she's an alien. A real one. She and Shaggy part on amicable enough terms, but she ultimately has to go back to her home planet (insert ''[[TheSimpsons Simpsons]]'' reference here).

* Megara in Disney's ''Disney/{{Hercules}}''. She is already working for Hades because of having [[DealWithTheDevil made a deal with him]], so when Hades discovers that Hercules is still around, he uses her as a pawn to get at him. Also a rare example in which the two end up together.

[[AC:Literature]]

[[AC:Live Action TV]]

[[AC:Videogame]]

[[AC:Western Animation]]

** This trope was revisited in the next season when Raven falls for a handsome magician trapped in a book--who turns out to actually be an evil dragon that Raven must defeat. Notably, Beast Boy is the one who consoles her afterwards.

* Something similar to this trope happened in [[Film/HarryPotter the film version of]] ''HarryPotterAndTheOrderOfThePhoenix'', resulting from the adaptation combining the characters Cho Chang and Marietta Edgecombe. In the movie it's implied poor Cho was under a truth potion, but that doesn't stop Harry from dumping her (in the novel, ''she'' dumps ''him'' over something completely unrelated).

** ''Witch's Ghost'' had Velma's (again, implied to be mutual) crush on horror novelist [[strike:Creator/StephenKing]] Ben Ravencroft, who turns out to be using the gang in an attempt to free his EldritchAbomination ancestor (the title character).
** Finally, in ''Alien Invaders'', Shaggy's girlfriend Crystal isn't a traitor, exactly, but she is connected to the film's haunting; she's an alien. A real one. She and Shaggy part on amicable enough terms, but she ultimately has to go back to her home planet (insert ''[[TheSimpsons Simpsons]]'' reference here).

* Anders in ''Videogame/DragonAgeII'' if he is your love interest. No matter what you do, he will blow up the Chantry near the end of the game in order to start a war between the two major factions, even if you are trying to be neutral.

* In the John Gardner JamesBond novel ''For Special Services'' Bond thinks Nena is the sympathetic BondGirl, but it turns out she's the BigBad.

* Something similar to this trope happened in [[Film/HarryPotter the film version of]] ''HarryPotterAndTheOrderOfThePhoenix'', resulting from the adaptation combining the characters Cho Chang and Marietta Edgecombe. In all fairness, it's implied poor Cho was under a truth potion, but that doesn't stop Harry from dumping her for some reason (in the novel, ''she'' dumps ''him'' over something completely unrelated).

* An episode of ''Series/{{Firefly}}'' has Mal being married to a young girl for a reward, but she later turns out to be a bounty hunter.

* Double Film/JamesBond example: ''Film/CasinoRoyale'' has Vesper, playing along with Bond until she steals the money to get her boyfriend (who she's still in love with) back. However, it turns out the boyfried is himself a traitor, seducing women with access to state secrets and using them to obtain and sell said secrets. Fortunately(?) she's killed before she finds out about that facet of his personality.

* In ''Series/{{Supernatural}}'', [[spoiler: Sam's love interest Ruby turns out to have been protecting him and teaching him how to use his powers so she could trick him into freeing Lucifer. It works.]]

* ''SkyHigh'' features a generally {{Adorkable}} NiceGuy named Will going out with an older girl named Gwen, whose role is basically [[MentorShip showing him the ropes of superhero school in between being sweet on him]]. Turns out she just wanted the weaponized FountainOfYouth in his basement...

* The SoBadItsGood-O-Rama that is ''SpyKids 3D: Game Over'' had [[KidHero Juni's]] girlfriend in the virtual world, [[LittleMissBadass Demetra]], turn out to be a program inserted into it to trick players into freeing the BigBad (who's also trapped there). In all fairness, she didn't ''want'' to do it, and ends up rebelling against her programming and holding open the virtual reality's [[FlatWhat physical exit(!?)]] so the human characters can escape. She's never mentioned again after this. [[FridgeHorror One can only hope the agency didn't delete the virtual reality with her still in there]]...

* An episode of ''{{Firefly}}'' has Mal being married to a young girl for a reward, but she later turns out to be a bounty hunter.

* ''{{Alias}}'' had Michael Vaughn's wife Lauren.

* In ''TheMentalist'' we have a male example: Grace's fiance in Season 3.
* Anders in ''DragonAgeII'' if he is your love interest. No matter what you do, he will blow up the Chantry near the end of the game in order to start a war between the two major factions, even if you are trying to be neutral.
* ''SeikimatsuOccultGakuin'' has an example in Mikaze, who is set up as a love interest for the hero but ends up being the BigBad.
* Double JFilm/amesBond example: ''Film/CasinoRoyale'' has Vesper, playing along with Bond until she steals the money to get her boyfriend (who she's still in love with) back. However, it turns out the boyfried is himself a traitor, seducing women with access to state secrets and using them to obtain and sell said secrets. Fortunately(?) she's killed before she finds out about that facet of his personality.
* ''Sisterhood'' series by FernMichaels: Starting with ''Final Justice'', Little Fish is set up to be a love interest for Countess Anne "Annie" Ryland de Silva and Stu Franklin is set up as a love interest for Isabelle Flanders. However, by ''Cross Roads'', both relationships are falling apart. The final blow comes when Little Fish and Stu Franklin are revealed to be CoDragons for BigBad Henry "Hank" Jellicoe - as well as cold-blooded murderers. Ouch!

* About half of ''Film/TheWorldIsNotEnough'' is spent building up BrokenBird Elektra King as JamesBond's new one and only, replacing dear departed [[Film/OnHerMajestysSecretService Tracy]]. The film is full of {{Call Back}}s to Tracy, comparisons between the two, and includes the most explicit Tracy reference of the Brosnan era, all the while implying that Elektra may not be completely right in the head (she enjoys fiddling with ice cubes mid-coitus, for one thing). ''Then'', at around the midpoint of the movie, it comes out that Elektra is in fact a WoobieDestroyerOfWorlds who is not only in on [[BigBad Renard the Anarchist]]'s plot to nuke Istanbul, she's [[BigBadDuumvirate co-author of it]]! Ultimately, Bond is forced to ShootTheDog in a vain attempt to stop her from telling Renard to move the stolen nuclear submarine into Istanbul's waters.

* The SoBadItsGood-O-Rama that is ''SpyKids 3D: Game Over'' had [[KidHero Juni]]'s girlfriend in the virtual world, [[LittleMissBadass Demetra]], turn out to be a program inserted into it to trick players into freeing the BigBad (who's also trapped there). In all fairness, she didn't ''want'' to do it, and ends up rebelling against her programming and holding open the virtual reality's [[FlatWhat physical exit(!?)]] so the human characters can escape. She's never mentioned again after this. [[FridgeHorror One can only hope the agency didn't delete the virtual reality with her still in there]]...

** ''Witch's Ghost'' had Velma's (again, implied to be mutual) crush on horror novelist [[strike:StephenKing]] Ben Ravencroft, who turns out to be using the gang in an attempt to free his EldritchAbomination ancestor (the title character).

* Megara in Disney's ''[[Disney/{{Hercules}} Hercules]]''. She is already working for Hades because of having [[DealWithTheDevil made a deal with him]], so when Hades discovers that Hercules is still around, he uses her as a pawn to get at him. Also a rare example in which the two end up together.

* Anders in ''DragonAge II'' if he is your love interest. No matter what you do, he will blow up the Chantry near the end of the game in order to start a war between the two major factions, even if you are trying to be neutral.

* Double JamesBond example: ''CasinoRoyale'' has Vesper, playing along with Bond until she steals the money to get her boyfriend (who she's still in love with) back. However, it turns out the boyfried is himself a traitor, seducing women with access to state secrets and using them to obtain and sell said secrets. Fortunately(?) she's killed before she finds out about that facet of his personality.

* About half of ''TheWorldIsNotEnough'' is spent building up BrokenBird Elektra King as JamesBond's new one and only, replacing dear departed [[OnHerMajestysSecretService Tracy]]. The film is full of {{Call Back}}s to Tracy, comparisons between the two, and includes the most explicit Tracy reference of the Brosnan era, all the while implying that Elektra may not be completely right in the head (she enjoys fiddling with ice cubes mid-coitus, for one thing). ''Then'', at around the midpoint of the movie, it comes out that Elektra is in fact a WoobieDestroyerOfWorlds who is not only in on [[BigBad Renard the Anarchist]]'s plot to nuke Istanbul, she's [[BigBadDuumvirate co-author of it]]! Ultimately, Bond is forced to ShootTheDog in a vain attempt to stop her from telling Renard to move the stolen nuclear submarine into Istanbul's waters.

* Elsa from ''IndianaJones and the Last Crusade''. To be fair, she genuinely loved Indy (and...uh...Indy's ''dad'' too, apparently), but she's single-mindedly obsessed with getting her hands on the Holy Grail to the point of working with Nazis.

* Fellow NostalgiaCritic victim ''WarriorsOfVirtue'' (also known as "that one with the ninja kangaroos") did this, too, with the girl joining up with the [[HamAndCheese hamalicious]] BigBad to avenge her brother, who had been accidentally killed by a kangaroo ninja. She's ultimately killed by her boss when she has a change of heart and helps the hero escape.
* The SoBadItsGood-O-Rama (and recent FilmBrain victim) that is ''SpyKids 3D: Game Over'' had [[KidHero Juni]]'s girlfriend in the virtual world, [[LittleMissBadass Demetra]], turn out to be a program inserted into it to trick players into freeing the BigBad (who's also trapped there). In all fairness, she didn't ''want'' to do it, and ends up rebelling against her programming and holding open the virtual reality's [[FlatWhat physical exit(!?)]] so the human characters can escape. She's never mentioned again after this. [[FridgeHorror One can only hope the agency didn't delete the virtual reality with her still in there]]...