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- All Space Battleship Yamato /Star Blazers stories set after the end of the second season portray the Gamilas (Gamilons in the U.S.) as allies of Earth, thanks to Leader Desslok's Heel–Face Turn.
- Except for the Bolar Wars Extended, a semi-canon webcomic. The Gamilons are on the side of Earth - the Galmans (basically the Ur-Gamilons) aren't.
- The Zentran/Meltran in Super Dimension Fortress Macross are pretty much split down the middle when they encounter humanity. Some stay with Bodolza, while a large chunk side with the humans. Later Macross series indicate that contact with "uncultured" Zentraedi fleets is still a semi-regular occurrence as humanity and their "cultured" Zentraedi allies explore the galaxy; sometimes they are successful in convincing these fleets to join their society, and sometimes they are not, resulting in wars.
- Artesia: Each faction in the setting has had previous alliances and works with whoever its current ruler thinks best serves the faction's interest.
- This is one of the main themes of The Urthblood Saga, based on the Redwall series where the line between "goodbeasts" and "vermin" was strongly established and rarely crossed. In it, the titular badger has received a prophecy of a coming dark crisis, and decides to bridge the divide between the two groups by taking vermin under arms and training them to be decent creatures and soldiers, in the hopes of countering it.
- The Dark World arc of the Pony POV Series has few bright spots, but this is one of them: Cadence takes control of the changelings from Chrysalis, and under her leadership they go from parasites to true symbiotic lifeforms living in peace with the other races.
- This ultimately occurs in the main timeline as well.
- At the end of Starship Troopers , it has been revealed that the "Skinnies", the race shown as one of the enemies in the very first combat scene of the book, have allied with Humans against the Bugs. The raid, in fact, was a scare tactic/warning by humans to convince the Skinnies to ditch the bugs.
- After the first book of the Sword of Truth series, the D'Haran empire become allies, primarily because the protagonist, Richard, turns out to be the heir to the empire.
- The Star Wars Expanded Universe has the Noghri, who were saved by Darth Vader from Palpatine and collectively owed him a debt and became his personal assassins. Then he gave them to Thrawn. Then Thrawn sent them after Leia; he didn't know she was Vader's daughter, but the Noghri (who can tell your bloodline by your scent) figured it out. Yeah, that went over well. (Though that alone wouldn't have been enough to get them to switch sides; the real turning point was Leia proving that the Empire's claim to be restoring the Noghri's poisoned soil in exchange for their service was a lie. Oh, and one other thing: they also worshipped Darth Vader as a god, and figured that because Leia was his daughter, that meant she must have been a divine being too.)
- In the Inheritance Cycle, the Urgals go from fighting in the evil king's armies to joining the side of The Varden, thanks to the king betraying them.
- In the original Shannara trilogy, the Rock Trolls serve in the evil Warlock King's army in the first book. In the second, having realised they were duped, they aid the elves in their fight against a demon invasion.
- The Slave Race Jaffa of Stargate SG-1 desert their evil alien masters en masse in the later seasons.
- Star Trek:
- Star Trek: The Next Generation: The Ferengi, partly due to Early Installment Weirdness, which portrayed them as Always Chaotic Evil Literal Maneater Money Fetishists. Characterization marched on and the first two were eventually dropped as they became extreme Libertarians. Finally, Nog became a Starfleet member, performing with honors, while Rom became the Grand Nagus and became shifting the Ferengi ever-so-subtly towards benevolence.
- In Star Trek: Enterprise, the Xindi's hat is that their "race" consists of several sentient species that evolved on the same planet. At the beginning of the Xindi arc, the crew of the Enterprise considers all Xindi to be their enemies. But by and by, Archer and co. manage to convince three of the five living Xindi species to do a Heel Race Turn. They help the humans in defeating the other two species and preventing the planned Earth-Shattering Kaboom.
- And in Deep Space Nine, we have the Cardassians, longtime enemies of the Federation and allied to the Dominion, suddenly switching sides - in the middle of a major space battle - due to the Dominion having just informed the Cardassians they had destroyed a city and killed its two million inhabitants as reprisal for an act of the Cardassian Resistance.
- While they slide back or waver a couple of times, the Klingons go from one of the Federation's main enemies in the original series to long-standing allies in The Next Generation. This was initially an off-screen change until Star Trek VI: The Undiscovered Country showed the beginning of the shift. DS9, however, turns it into a Heel Race Revolving Door when the Klingons invade a newly democratic Cardassia (on the false impression that the overthrow of the Cardassian military dictatorship = Dominion infiltration, an impression planted by the Dominion itself as it turns out) and then declare war on the Federation after the latter tells them to knock it off and provides asylum to the new Cardassian government. They then come running back to the Federation with their tails between their legs after the Cardassians join the Dominion in season 5.
- The most notable example of this in Doctor Who is the Ice Warriors. In the story "The Curse of Peladon", the Doctor is instantly suspicious to encounter Ice Warriors as members of The Federation, and spends most of the story suspecting them of being secretly malevolent, but is finally forced to accept that the culture has, indeed, become more peaceful and altruistic. The next (and last twentieth-century) Ice Warrior story "The Monster of Peladon" then has the revelation that the Ice Warriors in it really are the villains as a shock twist, but the bad guys are explicitly identified as a Renegade Splinter Faction who want to revive the old ruthlessly xenophobic ways. The first twenty-first-century episode to feature them, "Cold War", had an Ice Warrior as a villain, but it was set in the twentieth century well before any of the other TV Ice Warrior stories, and depicted the character has a Noble Demon whose conflict with the human characters was due to equally-xenophobic mutual suspicion rather than unprovoked malevolence.
- The frequency with which this occurs in Babylon 5 helps cement the show's reputation for moral complexity. The Narn Regime are the apparently "bad" guys for the first season, but after their former overlords the Centauri get power again and reconquer them they are treated as wholly sympathetic. The Centauri then pull a brief Heel–Race Turn after Londo kills the psychotic Emperor Cartagia, but apparently turn evil again in the final season, due to their government actually being taken over by a Puppeteer Parasite species. It's implied in the Distant Finale that they turn good again after said species are exposed and defeated.
- Many Elites in Halo switch sides around the end of Halo 2, after the Prophet of Truth orders their extermination.
- The Orcs in Warcraft III. The first two games had them as servitors of the coming demonic invasion, but Thrall's rise to warchief and push for the Orcs to return to their pre-demon shamanic traditions eventually led to them allying with the Elves and Humans to defeat Archimonde.
- All that's known about the Vortigants in Half-Life is that they're invading aliens. In Half-Life 2 it's revealed that they were confused and enthralled, and are now grateful for the destruction of their puppet leader. By Half-Life 2: Episode 1, they gather en mass to support Gordon specifically.
- The Arcadian Empire in Final Fantasy XII. At least in the ending.
- The Lurkers are brutish Mooks in the first Jak and Daxter; in the second game, they're... not necessarily good so much as oppressed. Brutter and the Lurkers he asks you to save seem pretty grateful, at any rate.
- In between the first and second Sword of the Stars, a group of Zuul came to a Heel Realization and split from the majority of their race to join the Liir.
- For a better explanation, The Zuul as a species learn primarily by Mind Rape of other sentient species. The more you fight them the smarter they get. Eventually a Zuul called The Deacon (who took the name after his band attacked a Catholic convent) got into a psychic battle with a Liir, who uploaded all its empathy and positive emotions into The Deacon. Combined with his knowledge of Catholic Dogma, this led to The Deacon becoming The Atoner and leading a faction of the Zuul, caling themselves the Prester Zuul, into allying themselves with the Liir. Most of them view themselves as 'priests' to the Liir and use their psychic powers to remove excessive negative emotions from their flock.
- The Zerg in StarCraft II: Heart of the Swarm, thanks to their queen Kerrigan regaining part of her humanity. To say they actually become good guys is a bit of a stretch (they still express interest in assimilating other species, and Kerrigan pretty much is keeping them on a leash), but at least they do join force with the good guys, and are on their way to help save the Universe against Amon by the end of the game. After Amon's defeat and Kerrigan's departure as a Xel'Naga, their new Queen, Zagara, seems satisfied with controlling the systems around their hive planet Char and leaving both Protoss and Terrans alone, though how long this will last is not clarified.
- In the X-Universe, the resident theocratic and xenophobic empire, the Paranid, join forces with the Earth State after they witness the Argon Federation blowing up Earth's Torus Aeternal, killing millions of Terran civilians in the process, before declaring war. A Paranid captain is instrumental in saving Earth from Argon artificially intelligent warships shortly before the jumpgate network abruptly shuts down.
- Early in The Elder Scrolls franchise, Orcs were a random enemy. They have since risen to the status of potential playable characters.
- Star Control II: In your fight to gather allies against the Ur-Quan and their slave races, a number of said slave races can be convinced to join you in various ways. The Spathi and the Thraddash can both be convinced to join your side, and you can incite an Enemy Civil War among the Yehat which will eventually lead to the side that supports you winning and sending you aid against the Final Boss.
- In Avatar: The Last Airbender, this presumably happened to the Fire Nation, when Ozai and Azula were defeated in the series finale, and Zuko became a new, benevolent Firelord. This didn't come out of the blue, though, as throughout Season 3 it had been shown that Fire Nation citizens weren't inherently evil. Most of them merely believed in the war propaganda promulgated by the governments of Ozai and his predecessors.
- The Highbreed in the Ben 10: Alien Force finale, after Ben ended the conflict with them peacefully by saving their species from extinction.
- The Changelings in the sixth season finale of My Little Pony: Friendship Is Magic, upon realizing that they can survive by sharing love instead of stealing it and constantly starving. They quickly follow the example of Thorax, and make up for their earlier kidnapping of the Royal Family and Elements of Harmony as well by freeing them with the destruction of Chrysalis' throne. Queen Chrysalis is the only one seen to refuse. This causes them to undergo metamorphosis (much like a caterpiller to butterfly) to much more colorful and love filled creatures.