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- Occult Academy has an example in Mikaze, who is set up as a love interest for the hero but ends up being the Big Bad.
- Kaworu Nagisa in the original Neon Genesis Evangelion anime. Arrives to NERV HQ as a new pilot who immediately takes an interest in poor, depressed Shinji when everyone else had either died or become estranged from him, turns out to be the final Angel. Since he genuinely cares for Shinji despite all of this, Kaworu ultimately goes with the Heel–Face Turn option and performs a Heroic Sacrifice to save both Shinji and humanity via allowing Shinji to kill him. Notable for being a same-sex example.
- Runaways: Alex is set up as Nico's love interest, but is ultimately revealed as the team's mole.
- As mentioned below, in the "Judas Contract" arc of Teen Titans Terra is set as this to Beast Boy. Noticeable in that this original Terra was far, far nastier than the cartoon one: while cartoon!Terra was a sort-of Dark Magical Girl, comics!Terra was a Manipulative Bitch.
- Jezebel Jet dated Bruce Wayne while trying to break him on behalf of the Black Glove in Batman RIP.
- A twist on this in Wolverines: Lady Deathstrike starts a relationship with Shogun, who is one body shared by the personalities of Sharp and Ogun. The Ogun personality is actually a former lover, and Deathstrike is playing the Sharp side for an opportunity to betray and "kill" him, so Ogun can fully take control of their body.
Films — Animated
- This happened to varying degrees in all three of the animated Scooby-Doo 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:
- 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 centuries-old soul-devouring cat monster...
- Witch's Ghost had Velma's (again, implied to be mutual) crush on horror novelist Ben Ravencroft, who turns out to be using the gang in an attempt to free his Eldritch Abomination 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 Simpsons reference here).
- Megara in Disney's Hercules. She is already working for Hades because of having 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 she does fall in love with him, the two end up together.
- A rare example of this being done with a male character is the Video Brinquedo "spectacular" What's Up? Balloon to the Rescue, in which the lead girl is infatuated with suave Frenchman (read: Devil in Plain Sight Ethnic Scrappy) Jean-Pierre.
- Prince Hans from Frozen is a Rare Male Example. He pretends to fall in Love at First Sight with Princess Anna, planning to marry her and then arrange an "accident" for her older sister Queen Elsa, and thereby become the King of Arendelle.
Films — Live-Action
- James Bond
- About half of The World Is Not Enough is spent building up Broken Bird Elektra King as Bond's new one and only, replacing dear departed Tracy. The film is full of Call Backs 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 Woobie, Destroyer of Worlds who is not only in on Renard the Anarchist's plot to nuke Istanbul, she's co-author of it! Ultimately, Bond is forced to Shoot the Dog in a vain attempt to stop her from telling Renard to move the stolen nuclear submarine into Istanbul's waters.
- Casino Royale (2006) 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's suggested that she did fall for Bond as well, cutting a deal to save his life in exchange for going through with the theft. Bond's Roaring Rampage of Revenge in the next film culminates with the reveal that the original boyfriend is himself a traitor, seducing women with access to state secrets and using them to obtain and sell said secrets. Fortunately(?), Vesper's killed before she finds out about that facet of his personality. She dies thinking that she has at least saved the lives of the two men she loved.
- Something similar to this trope happened in the film version of Harry Potter and the Order of the Phoenix, resulting from the adaptation combining the characters Cho Chang and Marietta Edgecombe. In the movie it's implied poor Cho was under a Truth Serum, but that doesn't stop Harry from dumping her (in the novel, she dumps him over realising that they simply didn't work out, since Cho was still massively hurting over the death of her boyfriend Cedric, murdered by Voldemort in front of Harry).
- Sky High features a generally Adorkable Nice Guy named Will going out with an older girl named Gwen, whose role is basically showing him the ropes of superhero school in between being sweet on him. Turns out she just wanted the weaponized Fountain of Youth in his basement...
- The infamous The Garbage Pail Kids Movie 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.
- Warriors of Virtue (also known as "that one with the ninja kangaroos") did this, too, with the girl joining up with the hamalicious Big Bad 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.
- Spy Kids 3D: Game Over had Juni's girlfriend in the virtual world, Demetra, turn out to be a program inserted into it to trick players into freeing the Big Bad (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 physical exit(!?) so the human characters can escape. She's never mentioned again after this. One can only hope the agency didn't delete the virtual reality with her still in there...
- Elsa from Indiana Jones 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.
- In the 1966 Batman: The Movie, Bruce falls in love with Kitka only to find out she's Catwoman (and definitely a villain in this incarnation).
- The Dark Knight Rises have Bruce romance his business associate, Miranda Tate, who is later revealed to be Talia al'Ghul, and also the Big Bad of the movie.
- Peggy Brandt in The Mask, as part of the Betty and Veronica Switch.
- In Dragon Bones, there is some flirting between Bastilla and Ward, and the woman turns out to be a traitor. It doesn't develop into an actual relationship before it becomes clear who is with the villains, though.
- James Bond
- In For Special Services, Bond thinks Nena is the sympathetic Bond Girl, but it turns out she's the Big Bad.
- Subverted in Icebreaker with Bond's Finnish girlfriend Paula Vacker, who initially seems to be on NSAA's payroll, but turns out to be an agent of SUPO (Finnish intelligence agency) working within the organization. The trope is played straight with the other love interest Rivke Ingber, who is revealed to be working for them when the former's allegiance is made clear.
- Two women accompany Bond throughout Nobody Lives for Ever as he makes way to SPECTRE's base, and once he reaches it, one of them is revealed to be working for them.
- Sisterhood Series by Fern Michaels: 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 Co-Dragons for Big Bad Henry "Hank" Jellicoe - as well as cold-blooded murderers. Ouch!
- In the Wraith Squadron trilogy this is the situation from the perspective of Myn Donos in that he falls in love with Lara Nostil only to find that she was the infiltrator that destroyed his squadron. Though more generally it is more of a Dating Catwoman scenario in that the reader fully knows who she is. It is also more complicated in that while she was originally an infiltrator, she defected to the New Republic without telling them.
- An episode of 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 (and/or marry), steal, leave 'em for dead, repeat...
- Alias had Michael Vaughn's wife Lauren.
- In The Mentalist we have a male example: Grace's fiance in Season 3.
- In Supernatural, Sam's love interest Ruby turns out to have been manipulating Sam into freeing Lucifer.
- Teen Wolf has this happen to Derek Hale, twice!
- In the episode "Turn, Turn, Turn," Agents of S.H.I.E.L.D. reveals that Ward was one for Skye.
- On The 100, Lexa kisses Clarke and asks her to come away with her to the Grounder capital, but soon afterwards betrays Clarke to Mount Weather. Unlike most examples of this trope, Lexa had no intention of betraying Clarke when she made those romantic overtures; she just felt that the deal Mount Weather offered her was more important than her personal feelings towards Clarke.
- On Blake's 7, Avon discovers that his old love Anna was an undercover Federation officer assigned to betray him. This being Blake's 7, he shoots her dead and then tenderly cradles her body.
- While he's not a full Love Interest due to his plot being mostly Dummied Out, Bishop of Neverwinter Nights 2 for a female protagonist. He will always betray her to the King of Shadows at the end of the game, and there is nothing she can do to stop it; at best she can persuade him to walk away from the battlefield, but he won't rejoin her side. And then a bunch of rocks fall on them both.
- Anders in Dragon Age 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.
- Penelope of the Sly Cooper games. She betrays Bentley due to his devotion to his friends over her, and becomes a major antagonist in the fourth game.
- In Tales of Xillia, Alvin was this to Presa in the past. A rare case where the traitor is on your side (well, at least half the time) and the one betrayed is a villain. (Though she's actually a Type IV Anti-Villain) It's implied she genuinely loved him, but... a compicated string of betrayals got in the way.
- Played with in Fire Emblem Awakening: The Avatar can be one of Prince Chrom's love interests if female, and has massive Ho Yay with Chrom if male... but the part where s/he kills Chrom and thus kicks off the Bad Future happens whether the Avatar is a male or a female and whether a girl Avatar is married to Chrom or not. Also, s/he doesn't do it willingly but only when his/her body is taken over by the Evil God Grima, whom s/he is supposed to be the vessel of... and the plot of the game as a whole is about preventing the Bad Future (and thus the Avatar's betrayal) from taking place.
- The Big Bad of Nine Hours, Nine Persons, Nine Doors turns out to be none other than June/Akane. Most of her behaviour is acted, but the affection appears to be genuine.
Word of God: "My intention was to create the world's worst heroine."
- It's unclear whether Word of God refers to her true self or her false facade. Its not even clear whether this facade is even a false at all, as it is possible that the personality she puts on is real but she's simply deceiving everyone in terms of information.
- Akane is an odd case. She is Junpei's love interest and the main heroine, in almost every meaning of the terms, but she also happens to be the main antagonist (a well-intentioned one). At the same time, she also share the protagonist and point-of-view character role with Junpei. Yeah, its that kind of game.
- In Baten Kaitos:
- Xelha falls in love with Kalas very badly, but he has other priorities, like avenging his grandfather and brother and helping the Big Bad unleash a Sealed Evil in a Can. They get together in the end.
- In the prequel, Milly drops from the sky to aid Sagi and Guillo, and unconditionally helps their quest while spying on the party's activities for one Big Bad, who's also her dad. She has a big crush on Sagi through, and eventually they elope together.
- Grand Theft Auto IV has this in the form of "Michelle", Niko's first potential girlfirend, who actually works for an shadowy government agency. Played with, as she's terrible at getting information from Niko, and it's clear that she regrets lying to him.
- Teen Titans: In addition to being a Sixth Ranger Traitor, the series's version of Terra was this to Beast Boy. It was implied that (unlike the original Terra), she did like Beast Boy back, trying to save him from the rest of the Titans' fate, but not enough to choose him over Slade. She ultimately rebelled against Slade when Beast Boy confronted her upon her deeds, and then performed a Heroic Sacrifice to save the whole city as well as the Titans themselves.
- 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 tried to use her as the key to return to the world, and whom Raven must re-seal and defeat. Notably, Beast Boy is the one who consoles her afterwards.
- In the Superman: The Animated Series episode "Superman's Pal", Jimmy discovers that his new girlfriend, Tina, is working with Metallo and only wants him as bait for Superman. The last we see of her is him locking her in a closet before going off to help the superhero.