Rival Turned Evil
John Cena: Dave. We've both been in the WWE a long time. I never had a problem with Dave, in fact there are times that I consider him a friend. It's just now.. now he's got a problem with me.
However at some point, their playful rivalry starts to escalate (a one-sided affair, usually) or they simply drift apart because of the plot. Often times the powder keg is a single event that breaks the increasingly tenuous friendship, at which point one friend becomes the villain. This can be part of a newly revealed dark past, or dealing with a major problem in a way his friend or other people can't tolerate. Sometimes it's just a very minor misunderstanding no one seems interested in clarifying.
After being cajoled enough, The Messiah's mission is to turn his friend back to the side of good while everyone else is trying to kill him. The new villain's job is to dredge up all his pent-up feelings of jealousy or inadequacy to justify his actions.
Compare Arch Enemy.
- Afro and Jinno in Afro Samurai. Interestingly, it's the protagonist, Afro, who "turned evil"—Everything Jinno does is to protect those at Swordmaster's dojo, while Afro is motivated purely by revenge.
- Nina and Arika's humorous Odd Couple relationship in Mai-Otome disintegrated due to a number of...misunderstandings, to put it mildly. They started out as rivals in academics as a result of Garderobe only allowing a limited number of students to advance, but over time, the rivalry is over the love of Nina's adoptive father Sergay. When it turns out that Sergay is anonymously supporting Arika, Nina becomes Nagi's Otome and tries to kill Arika.
- Likewise, Miaka and Yui in Fushigi Yuugi.
- Yui and Haruna in Corrector Yui. Though Haruna gets better more or less quickly.
- Sasuke and Naruto in Naruto is the definition of this. Interestingly enough, though, the rivalry started out one-sided and became mutual as Naruto got stronger.
- Spike and Vicious in Cowboy Bebop, although this is a probably an inversion - Vicious didn't turn evil (it's pretty clear he was always a sociopath) so much as Spike turned good. Or at least turned neutral.
- Actually, it is implied that Vicious didn't use to be this much of a sociopath, and Spike's betrayal pushed him over the edge.
- Tabool to Nabuca in Now and Then, Here and There. Winds up killing his best friend. Ample moments of Foe Yay make the turn even more disturbing.
- In Code Geass, Lelouch is an inverted form of this trope. Lelouch's philosophical disagreement with Suzaku over whether to destroy Britannia or fix it from within leads to the two childhood friends at gunpoint in the Season 1 finale. In R2, of course, Suzaku and Lelouch come to the conclusion that there's a better option than destroying Britannia or fixing it from within doing both.
- Temporarily reversed in R2 when Suzaku is seen to be playing for Charles but instead of them turning on each other, Suzaku eventually joins forces with Lelouch to put an end to the wars altogether.
- Megumi from Gate Keepers who turned traitor because she envied Ruriko's seeming superiority.
- Kaiser Ryo in Yu-Gi-Oh! GX occupied an odd spot in between The Ace and The Rival in season one, before having a Freak-Out in season two. Oddly enough, despite at least two attempts to break him out of it, neither succeeded. In fact, he gets better all on his own. Even before that, he's still something of a Jerkass protagonist in the second half of season three.
- And speaking of Yu-Gi-Oh, Yu-Gi-Oh! 5D's's Kiryu Kyosuke was the lead's best friend as the leader of Team Satisfaction, but he got too...excited by the whole conquering-Satellite thing. When he tried to duel all of Security (the police force) and ended up killing one of them, leading to a situation where he believed that Yusei had turned him into the police, Yusei's and Kiryu's friendship got shot to hell. Kiryu died, which ironically meant that while he got better and It Got Worse happened at the same time.
- And by, It Got Worse, we mean he got so Ax Crazy you could make a case of him reaching critical, Dilandau Albatou levels.
- Also from 5D's, Jack Atlus. Prior to the series setting he was also a member of Team Satisfaction, and a friendly rival to Yusei. He grew more and more distant from his friends following the break-up of the team, and eventually accepted an offer to become King in return for betraying Yusei by stealing his D-Wheel and Stardust Dragon, which he accomplished by endangering Rally's life. He's by far a less extreme example than Kiryu, though, as this was basically the last truly evil action he took, and once Yusei settled their score he quickly became a protagonist and sought redemption in the second season.
- Kenshiro and Shin from Fist of the North Star were friends from different martial art schools who were in love with the same woman until Jagi, Kenshiro's jealous brother, swayed Shin into betraying Kenshiro and taking Yuria for himself.
- In the anime version of Dragonaut: The Resonance, Kazuki and Jin started out as friends. Jin was forced to drop out of the program they were both working in during an accident which ultimately resulted in Kazuki's Dragon rejecting him and accepting Jin. When Kazuki finally gets a Dragon and ends up fighting Jin, he gets badly scarred, causing him to hate Jin even more.
- In the Ice and Snow arc of D.N.Angel, Kyle, Elliot's best friend does this because of the Two Guys and a Girl scenario. He's eventually doomed a la Rime of the Ancient Mariner to tell the story so others don't make his mistake after he causes BOTH of their deaths. Sort of. It's complicated.
- Kenichi: The Mightiest Disciple works this in, but it's among the many things Kenichi has *forgotten* since his childhood. Notably that Big Bad Odin is really a childhood friend who made a promise with Kenichi that they would both get stronger...before insisting on fighting over a pin Kenichi received. Odin reveals that it was the loss in that childhood fight, coupled with the humiliation of being offered the pin afterward anyway, that set him on the Path of Asura.
- In Gundam Wing, Milliardo and Treize, but it is more of Civil Warcraft
- And in Gundam Seed, Kira and Athrun towards each other.
- In Macross Frontier, Ranka temporariliy turns evil, at least from the human perspective, due to Mind Control. Then she breaks out of it with the help of Sheril and in return saves her life
- Enchu for Muhyo in Muhyo and Roji's Bureau of Supernatural Investigation. Initially, his grades were far superior to Muhyo's because he put in effort while Muhyo did not, but as Muhyo's talent awoke, he began surpassing Enchu. This was a particularly sore spot for Enchu, as he hoped to become an Executor to support his sick mother. Losing the position to Muhyo shortly after losing his mother broke Enchu, and resulted in his Face Heel Turn. It turns out that Teeki invoked this trope to find a powerful body to take as his own, and killed Enchu's mother to turn him evil.
- Doctor Doom and Reed Richards are probably one of the most straightforward examples of this trope. The catalyst for Doom turning evil was an incident where Reed pointed out a flaw in one of Doom's projects when they were both classmates in grad school rivaling for the spot of top student, and Doom, thinking Reed was just jealous, ignored him, only for the project to blow up in his face, disfiguring him and getting him expelled. Doom was so infuriated by the idea that that infernal Richards had bested him that he rejected that version of reality, blamed Reed for the accident, and dedicated himself to destroying Reed's life in "revenge".
- And not only that, but the "rivalry" part of their relationship (in addition to the blinding, obsessive vendetta) is still in full force, as the reasons for all of Doom's evil plans to Take Over the World, gain cosmic power, topple governments, decimate the superhero community, and rain death and destruction upon all oppose him can eventually be traced back to his desire to get one over on his old college pal. (He'll even delay killing Reed to make him admit Doom is better than he is.)
- In the Spider-Man comics, Eddie Brock was a reporter that developed a grudge against Spiderman when the latter apprehended Sin-Eater. Brock had been interviewing a compulsive confessor and lost his job in disgrace. In addition to his job loss and inability to find a new one in journalism barring tabloids, he was also diagnosed with terminal cancer, so when he encountered the symbiote (which had tracked Brock by his negative emotions and the cancer upon which it feeds) in the church where Spiderman had abandoned it, he was more than willing to use the symbiote to get the revenge he craved... armed with the knowledge of Spiderman's secret identity and calling himself Venom in reference to the types of articles he was paid to write. He ultimately reformed and gave up the symbiote knowing that without it he would eventually die of the cancer ravaging his body.
- Except the trace of the symbiote in his blood fused with white blood cells and created the menacing Anti-Venom, who, while not as evil, and fights villains like the current Venom Mac Garnagan (AKA: The Scorpion), still holds a grudge with ole Spidey. Oh well.
- This was inverted in the 70's Marvel Universe comic Shang-Chi, Master of Kung Fu. As an acolyte of the despotic ambitions of his father, Fu Manchu, Shang-Chi was always just a little better than his childhood friend, Midnight. But in this case it was Shang-Chi who turned, rejecting his father's evil and leaving the organization. Naturally, his old friend got sent after him. Said friend added a righteous sense of betrayal to his previous resentment.
- The Legion of Super Heroes: Some versions of Lightning Lad's relationship with his brother Mekt (Lightning Lord) go this way.
- Subverted in Elf Quest. Rayek starts out as Cutter's rival of sorts. Several times in the story, he appears to be about to turn evil, but despite his screwups, he never does, at least, not permanently. Rival Turned Heel Face Revolving Door?
- The Superman villain Conduit was once a childhood rival and friend of Clark Kent but tried to kill him years later.
- Batman villain Tommy Elliot, or "Hush," had ostensibly been Bruce Wayne's childhood friend. He met Bruce after Dr. Thomas Wayne, Bruce's father, saved Tommy's mother from a car crash. In truth, however, Tommy always secretly hated Bruce and, in fact, had himself sabotaged his parents' car to kill them and gain his inheritance.
- Tony Stark gets one for a short time in the form of Tiberius Stone, who's implied to have been a sociopath from the beginning, just very good at hiding it. "Short time" because by the end of the arc, Stone has been left comatose, and tends to be forgotten by later writers.
- Obidiah Stane also served this purpose.
- Doctor Strange had Baron Mordo, until he reformed while dying of cancer. And then he was brought back as a villain because the writers either forgot about his reformation or were just too lazy to create a new evil sorcerer.
- In Wolverine: Origin, Dog starts out as James Howlett's friend, but eventually they drift apart, and Dog even kills James' puppy. Years later, Dog tracks him down and they fight, and it's possible Dog became Sabretooth later on. This one also works for Two Guys and a Girl, with James, Dog, and Rose.
- Recently, in the Sonic The Hedgehog comics, Sonic's old rival Geoffrey St. John was revealed to be working for Ixis Naugus, and is implied to have been working for him for some time.
- Catwoman: Cassandra Cartland grew up in the same orphanage as Selina Kyle where Selina rebuffed Cassandra's attempts at friendship. Cassandra grew bitter and resentful and, after learning that Selina had become Catwoman, created her own villainous identity of She-cat and attempted to frame Selina for crimes she committed.
- Eddie Brock is portrayed this way in Spider-Man 3, as fighting for Peter's position at Jameson's office. The Rival/Evil Turn comes after he tries to cheat his way ahead and Peter exposes him; Peter, wearing the Venom suit, goes to a local chapel seeking repentance, while Eddie goes to the same seeking revenge; the church bells ring, disturbing Venom sufficiently that Peter is able to fight him off, and Venom drops down a few stories to take over Eddie, who is a much more willing host...
- While he and Ip Man never became friends, Jin descended from martial artist rivalry to becoming a bandit and later selling Ip Man's last known whereabouts to the Japanese. He does a Heel Face Turn back by the second film.
- Ben and Ian in the first National Treasure movie.
- The 2002 film version of The Count of Monte Cristo with Guy Pierce and Jim Caviezel differs from the book by making Dantes and Mondego good friends with a friendly rivalry before Mondego betrays Dantes out of jealousy.
- The escalation of this effect drives the plot of The Prestige. Robert Angier and Alfred Borden are both amateur magicians working fairly amicably as audience plants for another magician. However, when Angier's wife is killed and Borden appears to be responsible (it's possible that he's entirely innocent) Angier devotes himself to destroying Borden by any means including sabotaging and stealing his tricks as well as killing himself dozens of times over just so he can eventually frame Borden for murder and take his daughter. Borden remains far from innocent though and retaliates by constantly ruining Angier's chance at fame and stealing his mistress.
- Like his comic counterpart, Iron Man had his fair share of evil rivals. The first was Obidiah Stane who, in the Marvel Cinematic Universe was an in-company rival to Stark Enterprises as opposed to the head of his own company. He eventually turned evil and tried to kill Stark. In the second film, Justin Hammer was a business rival who ended up releasing an international criminal who had previously killed many people and tried to kill Stark, in order to defeat Stark Enterprises.
- Harry Potter:
- James Potter and Severus Snape never got along at school, made worse by the fact that Lily, Snape's childhood friend who he was thoroughly in love with, ended up marrying James, while Snape turned evil. Snape turned back to the side of good because Lily was in danger, and stayed on the good side because his previous evil actions caused her death.
- Draco Malfoy, after having been The Rival for five books, joins Voldemort's side and becomes significantly more dangerous in the sixth book.
- The Inheritance Trilogy: Murtagh pulls a Face Heel Turn while everyone else thought he was dead. Supposedly this is because the Big Bad knows his true name, but he also displays some jealousy of his brother Eragon. Unlike other examples, he is surprisingly reasonable about it, including sparing Eragon's life.
- Saruman in the Lord of the Rings turned to the Dark Side because he was jealous of Gandalf having received the Ring of Fire from Círdan upon their arrival in Middle-Earth.
- Happens with Brutus in Con Iggulden's Emperor series. He starts out as Caesar's loyal blood brother, but as time goes by he grows increasingly jealous of his friend's success as a general and a politician. Eventually he leaves Caesar to fight for Pompey in the civil war, and tells Caesar later that he did it because he wanted to be someone without having to stand in the shadow of the great Caesar.
- Faquarl of The Bartimaeus Trilogy was already evil, but he's The Rival of the titular character and a White-Haired Pretty Boy, so he fits.
- At the end of Graham McNeill's Warhammer 40,000 Ultramarines novel Dead Sky Black Sun, Honsou corners the Space Marine Vaanes, who had helped Uriel against Honsou before deciding that it cost too much. Honsou offers to let him work for the Chaos forces and promises Revenge, and Vaanes accepts. Sequel Hook, anyone?
- It seems as if half the Forsaken in The Wheel of Time had been very talented and effective good guy generals and Aes Sedai who could not stand that their rival Lews Therin Telamon (whom they were at least fairly friendly/neutral colleagues with at one stage), The Dragon, was better than them, thus turning to the Dark One (Notably not the case for other Forsaken like the sadistic, and unparalleled healer, Semirhage, or The Philosopher Ishmael).
- Pasha in Doctor Zhivago, though he was Lara's friend (and thus more of a romantic rival for Yuri).
- Septimus Heap: Simon Heap became an antagonist after Septimus got the ExtraOrdinary Apprenticeship.
- Breezepelt from Warrior Cats was originally the rival to Lionblaze and Jayfeather, but he was friendly enough to team up with them on occasion. However, in Omen of the Stars he is recruited by the Dark Forest and turns homicidal.
Live Action TV
- The early seasons of Smallville dealt with Clark and Lex's relationship this way.
- The Master and The Rani from Doctor Who are two examples as well.
- Buffy and Faith interacted this way, sliding in and out of rivalry as the story progressed.
- 24's Jack Bauer seems to have an endless string of these, particularly Christopher Henderson. He and Tony both got to see the sights of Nina Myers.
- In Kamen Rider 555, the two main characters, Inui Takumi and Kiba Yuuji, switch back and forth between friends and enemies, not once but several times. Eventually, Kiba does a Face Heel Turn and becomes an all-out villain, but in the last episode he returns to the Light Side and does a Redemption Equals Death.
- Hiro Nakamura and Takezo Kensei/Adam Monroe of Heroes.
- Although they didn't have much 'rivalry' initially; Hiro behaved more like some kind of Manic Pixie Dream Girl very much minus the 'dream girl' part.
- Sora and Riku in Kingdom Hearts. Riku turns to the dark side by More Than Mind Control, and is eventually possessed by the Big Bad. After he's freed from this possession at the end of the game, he spends Chain of Memories and Kingdom Hearts II dealing with the consequences. It's especially interesting that Riku fits all three of the marker tropes at the top of the page: he was supposed to have the Keyblade, has very nearly white hair, and grew up with Sora and Kairi.
- Squall and Seifer in Final Fantasy VIII.
- Sagat turned to crime and hatred after losing a fight to Ryu (and getting hideously scarred in the process. In his defense, Ryu did (technically) cheat. He turned good again, but you wouldn't know it from the games.
- Caim and Inuart in Drakengard. Inuart is helped along his Face Heel Turn by More Than Mind Control.
- One of the plotlines of Breath of Fire V: Dragon Quarter mostly follows this trope. Ryu and Bosch start the game, while not necessarily as mutual friends, at least as co-workers. When Bosch starts observing (and once ends up on the wrong end of) Ryu's suddenly-manifested dragon powers, he jealously begins resorting to increasingly twisted means to match that power, including getting a freaky cybernetic body and, eventually, gaining similar powers from an evil dragon, after it sensed his selfish motives.
- In the backstory for City of Heroes / City of Villains, the men who would become archnemeses Statesman and Lord Recluse were once very good friends. When they drank from the Well of the Furies, one became an Incarnate of Zeus, got lightning powers, and named himself Statesman, while the other became an Incarnate of Tartarus, grew spider arms, and named himself Lord Recluse. One of them became an evil overlord.
- Ryudo and Melfice in Grandia II were in fact brothers, but like everybody from their soon-to-be-cursed village very competitive. Melfice turns out to be possessed by the Horns of Valmar, forcing the brothers to fight. Additionally, Ryudo meets up with his childhood friend and rival who has to admit he's become soft and Ryudo is currently a better swordsman than him, at least until he starts training again.
- Cecil and Kain in Final Fantasy IV. Kain was being (at least partially) mind-controlled, and he repents eventually, but his jealousy over Cecil (mostly regarding Rosa) makes him that much easier to control.
- Valis: Yuko and Reiko.
- EarthBound: Ness and Pokey, though they weren't ever really friends. (Ness is on better terms with his brother.)
- Understatement. The guy starts out cowardly, bitchy, and self-centered (you see the type in media being self-aggrandizing when the danger has passed). Things go downhill with him from there.
- Oddly, he doesn't seem to know what he wants to be as far as Ness goes, In mother 3, you can find Ness' yo-yo in Porky's playroom in the thunder tower, it's named "Friend's yoyo".
- Lyon of Fire Emblem: The Sacred Stones.
- Maxim in Castlevania: Harmony of Dissonance.
- Before that, Hugh Baldwin in Circle of the Moon. He's the son of his and Nathan's master, and is jealous enough of Nathan getting the Vampire Killer that he turns evil and is fought as the second-to-last boss.
- Straybow in the Medieval chapter of Live a Live; jealous of his childhood friend Oersted's fame and success, he ultimately orchestrates a plan intended to thoroughly disgrace and break him. Whether he intended it or not, he ultimately ends up causing Oersted to undergo a major Face Heel Turn, basically declaring that Humans Are the Real Monsters and becoming the game's Big Bad. So, in the end, both rivals turn evil.
- Songi starts as Gala's rival in Legend of Legaia. He quickly turns more and more depraved and villainous in his journey for greater power.
- Dist from Tales of the Abyss fits this trope perfectly.
- Dr. Wily from Mega Man fits this trope.
- As does Ivan Warner, an Expy of Wily from Joy Mech Fight.
- Revya becomes this to Danette during the Demon Path in Soul Nomad.
- Steiner is blatantly set up for this in Luminous Arc 2, although it's worth noting that from his viewpoint, the hero has turned evil (having collaborated with several criminals, one of whom was an accomplice to a mass murderer.) The two go through the standard "redeem each other or kill each other" schtick before Steiner sacrifices himself to kill a greater villain.
- Jake from Ape Escape
- Dirk in Suikoden Tierkreis is a mentor turned evil—not an Evil Mentor, but a formerly good mentor who succumbs to a combination of fear, suspicion, and jealousy after his proteges a): suddenly acquire magical powers they never worked to earn, and b): start to remember things he's certain never existed. He starts out just trying to snap them out of it, but winds up barely coherent.
- Peter Parker and Eddy Brock in The Spectacular Spider-Man were childhood friends, but over the course of the series they drift further apart, as Eddy's grudge becomes greater, leading to their destined battle as Spider-Man and Venom.
- In Transformers Prime Optimus and Megatron were once friends as Orion Pax and Megatronus while they worked together basically to progress civil rights on Cybertron. It didn't end well. Optimus still thinks he can bring his old friend back until towards the end of the first season.
- apparently, accidentally brusing the ego of the great Victor von Doom makes you deserving of constant stalking, murder attempts, targeting of your wife and friends, forced duels, repeated physical and psychological torture, mind rape, attempted genocide of your country, kidnapping your kids, screwing with your head and ill-handled guilt complex until you almost lose your mind/fly into a homicidal rage, and basically turning your life into one long, exhausting, never-ending hell.