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[[quoteright:350:[[ComicBook/TheTransformers http://static.tvtropes.org/pmwiki/pub/images/unicronnoms_7171.jpg]]]]
[[caption-width-right:350:Unicron, the Chaos-Bringer.]]

->"Understand this. So long as you stand in my way--so long as anybody stands in my way, I will respond by killing. Murder on an industrial scale. Because in the final analysis, I would happily wade across a river of corpses, chest-deep in grease and engine oil just to crush the spark of the last Autobot standing. And I would do so not simply as a means to an end, no. I'd do it, Prime, because [[ForTheEvulz it would give me pleasure]]."
-->-- '''Megatron''', ''[[ComicBook/TheTransformersIDW Chaos Theory, Part 1]]''

The LongRunner franchise Franchise/{{Transformers}} has numerous {{Complete Monster}}s.

* [[BigBad Megatron]] is a [[CardCarryingVillain self-proclaimed]] tyrant and would-be GalacticConqueror, who named himself after his world's equivalent of TheAntichrist. A [[BadBoss user and abuser]] of his followers, Megatron divides the world into enemies and pawns, killing or enslaving the former, and ruthlessly exploiting the latter. A gloating sadist, Megatron never kills anyone quickly when prolonged torture will do, considers his own allies [[WeHaveReserves expendable]], and hopes to bring Cybertron, and eventually the galaxy, under his heel. His more notable crimes include: extracting half of Rampage's spark, placing it in a vise, and using it to torture Rampage into submission; ordering Dinobot to kill Quickstrike, one of Megatron's more loyal soldiers (though this is a relative term), after Quickstrike lost to Dinobot in a sort of re-entrance exam into the Predacons (Dinobot refused); an aborted genocide of humanity's common ancestor; attempting to rewrite all of his history by killing the original Optimus Prime; and finally, sacrificing all his remaining troops in order to gain control of the ''Nemesis'' and set out to overrun the galaxy. His defeat doesn't stop him either - when he returns in ''WesternAnimation/BeastMachines'' he's gotten worse, picking up a serious [[AGodAmI god complex]] along the way. Seizing control of Cybertron, Megatron [[YourSoulIsMine extracts the sparks]] from everyone on the planet, reducing them to [[SoullessShell mindless drones]]. Accquiring a hatred of all organic life, Megatron tries to scrub Cybertron clean of it, resulting in the near destruction of all life, robotic and organic, on his home planet when his last mad grasp for power finally fails.
* [[GiantSpider Tarantulas]] is Megatron's EvilGenius, and a schemer and [[ChronicBackstabbingDisorder backstabber]] second to none. Planted as TheMole in Megatron's operation by the Predacon SecretPolice, Tarantulas is a cackling MadScientist, who enjoys performing gruesome experiments on his victims, and [[VillainousGlutton eating]] anything or anyone he catches in his giant webs - it doesn't matter whether it's organic or [[ImAHumanitarian robotic]], he admits to enjoying the act itself more than the meal. He brainwashes several Maximal protoforms into becoming Predacons, most notably Blackarachnia and Inferno, and eventually reveals that he hopes to [[TheStarscream usurp control of the team]] from Megatron. That's all in Season 1. Tarantulas only gets worse after this. He exploits and {{Mind Rape}}s Blackarachnia, leaving her with a paranoid terror of him, and later swears a vendetta against her, promising to hunt the other spider down and kill her for daring to defy him (if this sounds suspiciously like DomesticAbuse, it should). He tries to destroy The Ark, which would have lead to [[OmnicidalManiac Unicron]] [[PlanetEater devouring]] Cybertron in the future, and the extinction of the Transformers as a species. Ultimately betraying both sides, Tarantulas is revealed as the spawn of [[UltimateEvil Unicron]], and attempts to use alien technology to wipe out Autobot, Decepticon, Predacon, and Maximal alike, swearing that when he's done with his own species, he will return and [[FinalSolution commit genocide]] against the aliens themselves. Void of loyalty or conscience, Tarantulas makes even [[EvenEvilHasStandards his own nominal allies uneasy]], a fact that he is downright proud of.

* Lockdown killed his old master (as well as TheObiWan to Prowl and Jazz) to steal Transformer [[strike:infants]] protoforms in order to sell them and tortures his bounty hunting victims by cutting off their specific upgrades and using them to make himself more powerful. He enjoys hunting more for the thrill of the chase and the chance to vivisect his victims than anything else.
* Another true monster is the human supervillain Meltdown. After being mutated by his own experiments, he tries to kill his rival, Isaac Sumdac, in a fit of rage whilst blaming him for all his problems (including [[NeverMyFault his self-inflicted transformation]]). Later, he becomes so obsessed with creating a human transformer, he not only mutates at least two innocent humans into gruesome hybrids mish mashed with animal parts, he decides to kidnap Sumdac's innocent eight-year-old daughter as his newest test subject (deciding to experiment on children in general now). When Blackarachnia breaks him out of jail in exchange for him eliminating her organic half, he double-crosses her and tries to destroy her transformer half - a deed which, if not destroying her soul completely, would have left her with a completely organic body she's disgusted with. [[ArsonMurderAndJaywalking But damn, can he dance]]. He also forces the Dinobots to work for him by painfully burning them with his acidic touch until they follow his commands. He hurt them so badly, that they were willing to turn on Bulkhead and Prowl, their only friends among the main cast, just to stay in Meltdown's good graces. No wonder Meltdown is the ''only'' human villain in ''Animated'' played as a deadly serious threat to the Transformers. Dancing aside.

* [[RightWingMilitiaFanatic Silas]] is one of the few human villains in Transformers ''history'' to hold this trope. In "Operation: Breakdown", he captures Breakdown, tortures him, tries to have him vivisected, and removes one of his eyes. In ''Crisscross'' he allies M.E.C.H. with Airachnid, a Complete Monster herself, to get his hands on another Cybertronian (this time, Arcee) and was perfectly willing to let Airachnid kill Jack Darby, a sixteen-year old teenager, and his mother to do it. He even states a few human lives are worth it for Arcee's tech. In "The Human Factor", after his men upload him into the now-dead Breakdown's empty shell, saving his life in the process, he thanks them for that and their years of loyal service by thanking them personally and then [[UngratefulBastard slaughtering them]]. He then betrays the human race to Megatron, seeing himself as a superior being, razing a ''military base just to get Megatron's attention'', then attempting to blow up everybody inside Raf's house (for reference, that's the human trio, Agent Fowler and Raf's mother). It says something that Knock Out is completely disgusted by him, and Megatron calls him an abomination, though admittedly Megatron hates all humans.
* [[EgomaniacHunter Airachnid]] is by far one of the evilest villains of the current cast. She's a self-styled "ex-Decepticon" who spent her time in the Great War capturing, torturing, and slowly killing any Autobots she could find. For certain victims, like Arcee, she'd go out of her way to find people they cared for and murder them before their eyes as part of her fun. After the war left Cybertron, she struck out solo to pursue a new hobby: hunting endangered (and soon to be extinct) species for sport and collecting grisly "trophies" of her kills. Should she find an attractive species that ''isn't'' endangered, not to worry, she'll ensure that they are by the time she's done. After coming to Earth, she's decided to make humans her new toys, as Jack found out the hard way. Airachnid's not under orders or attempting any form of grand scheme, [[ForTheEvulz she just finds it fun]]. There's also the utterly brutal way she [[spoiler:kills Breakdown, tearing him into pieces]]. She's an unholy blend of Tarantulas, Beast Wars [[SerialKiller Rampage]], and [[PsychoForHire Lockdown]] pressed into a spider's shape and let loose on the universe.

* Megatron/Galvatron in this continuity - though a NobleDemon in "Armada" - eventually enters CompleteMonster territory at about the time he uses the Super Energon in "Energon". In "Cybertron", he goes into full OmnicidalManiac mode. The point when he's absolutely solidified to be one is during the confrontation between him and the planet leaders in the black hole. When he reveals his AGodIAm plan to destroy the universe then recreate it [[InTheirOwnImage in his own image]], he's asked how he plans to save his followers from the fate of the rest of the universe. He doesn't. As far as he's concerned, if they can't survive the end of the world, it's not his problem. At this point, every character present views him as this trope.
--> "It's over Galvatron. You don't care about anybody, and nobody cares about you."
* [[TheHeavy Sideways]], Unicron's dimension-traveling [[TheDragon Herald]] became one of these during his ''Armada'' incarnation. Posing as a drifter with no particular allegiances, Sideways befriends Hot Shot and joins up with the Autobot cause, while plotting with the Decepticons behind their backs. Pretending to be Megatron's hostage, Sideways [[ManipulativeBastard manipulated]] Hot Shot into handing over the [[CoolSword Star Sabre]] to Megatron, and then revealed his alliance with the Decepticons, [[BreakingSpeech laughing about how Hot Shot was a fool to trust him]]. Now one of Megatron's most trusted men, Sideways planted seeds of mistrust in the Decepticon ranks, tricking Starscream into turning on Megatron, while secretly communicating with [[PlanetEater Unicron]] about their weaknesses. Found out, Sideways fled, only to return using [[EvilKnockoff Nemesis Prime]] to attack the Autobots and Decepticons alike, and persuading Decepticon Thrust to ally with Unicron, only to discard him the moment he is [[YouHaveOutlivedYourUsefulness no longer necessary]]. Laughing Megatron and Optimus Prime's faces, Sideways reveals that he [[PlayingBothSides stoked the flames of Autobot/Decepticon conflict]] so that he [[WarForFunAndProfit could use their mutual hatred]] to reawaken and empower the sleeping Unicron. The perfect con artist, Sideways takes his moral cues from his master, and is loyal only to his own dream of [[OmnicidalManiac multiversal destruction]].

* ''ComicBook/TransformersLastStandOfTheWreckers'': Overlord is probably the perfect example of the CompleteMonster trope in Transformers fiction. He's one of the most powerful Decepticons but unlike the others he doesn't give a damn about the cause, or conquest, or even defeating the Autobots. He just wants to kill anything and everything he can, in as many sick and twisted ways as possible. He horrifies ''all'' Cybertronians, Autobot and Decepticon alike, and Megatron was wary of him that he had Shockwave alter his brain so that Overlord could never beat him. When he took over Garrus 9, he essentially turned it into a cross between a concentration camp and a gladiatorial arena, with torture, murder, and prisoners being forced to fight to the death for his own sick amusement. Nothing any other Transformers villain has done really compares to the pure evil that Overlord is guilty of.
* ''ComicBook/TransformersMoreThanMeetsTheEye'': Pharma is a former Autobot Medic who went evil. During the war, he saved one of the main character's lives when he was shot in the stomach, and later did a quadruple organ transfer, donating one of his organs to the process. He became the head medic at a medical facility on the planet Delphi, where he received death threats from an elite Decepticon unit who threatened to overrun the place. He began bribing them with organs from dead bots, but as the demand got higher, he began killing living ones to meet the demand. Eventually it becomes too much, and he has two other Decepticons unleash a plague on the facility to kill everyone and cover up his crime. When he's revealed, he shoots a life-support sending about 20 patients into near death states to distract everyone. He then tries to kill Ratchet twice before being thrown off the facility into a Disney Villain Death. He survives the fall and is recruited into Chief Justice Tyrest's group (Tyrest is the guy who drilled a hole in his head and is trying to destroy all Transformers he considers inferior). All the Decepticons admit to being freaked out by him, and when he finds Ratchet again, he separates Ratchet's head and spark from his body and starts torturing him. Ratchet accuses him of being a medic to prove he's the best rather than for any altruistic purposes. Pharma and Ratchet engage in a competition to prove who's the best by fixing someone. Pharma agrees and has one of his co-workers from Delphi, Ambulon, sliced in half with a chainsaw, vertically from head to crotch, and tells Ratchet to fix him. Ambulon dies in agony before the Chainsaw leaves him and later Pharma shoots Brainstorm. Even if he has a smaller body count than the likes of Overlord, and counting on what resources he had at hand, he rivals Overlord on sheer cruelty based on how his victims died.
* ''TransformersShatteredGlass'': Ultra Magnus was locked up in his universe for trying to usurp Optimus (and he got his face ripped off in addition to failing). He and several others travel to earth, where he assimilates numerous Autobots into the Junkion hordes (becoming mindless slaves and dead in all but name). After that, he proceeds to set up a plan to take rarified energon from earth with his sword and destroy it. His plan is foiled when a shield is placed around the earth but his real plan was to actually cause the death of the entire universe! He just destroyed a reality! Even the Normal Decepticons turned against him (They wanted to be the conquerors) and [[EvenEvilHasStandards were appalled]] when they realized the extent of the damage.

[[AC:[[Franchise/TransformersFilmSeries Live-Action Films]]]]
* ''Film/TransformersDarkOfTheMoon'': Dylan Gould has spent his adult life aiding the Decepticons in their plans on Earth (saying they're "clients" he "inherited" from his father) and assisting them in their takeover of Chicago, which sees thousands of people gunned down in the streets, all to ensure that he'll be spared. This could just be written off as him being a DirtyCoward, but the moment that has him [[MoralEventHorizon cross the line further]] is when several Autobots have been captured and Gould humbly suggests to Soundwave that they shouldn't be taking prisoners at all. When the pillars have been shut off, meaning the Decepticons' plan has been foiled and he has the option to defect to the good guys and possibly be spared, if jailed, he chooses to reactivate the pillars for no real reason. This is most sensibly interpreted as being done out of sheer spite, even at his own expense, considering the Decepticons have all their human minions [[YouHaveOutlivedYourUsefulness killed once they cease to be useful]] and will likely do the same to him.
* ''Film/TransformersAgeOfExtinction'': CIA agent Harold Attinger is the creator of "Cemetery Wind, " a black-ops group taking it upon itself to wipe out all Transformers upon the planet regardless of faction, all out of nothing more than Attinger's FantasticRacism. Attinger entered a deal between himself, Lockdown, and Joshua Joyce's Kinetic Solutions Incorporated where Lockdown gives the remains of any Transformer he murders to Joyce for production into man-made Transformers, and Attinger would trade Optimus for the Seed needed to create more man-made transformers to sell to the US Army. At first, Attinger may come across as a WellIntentionedExtremist, but given that he worked with Lockdown, wanted to create Transformers of his own, would have millions of innocents killed by The Seed, along with his own attempts to kill any humans who could get in his way (such as Tessa Yeager by proxy of his Dragon Savoy and Cade Yeager at his own hand) and ordering Savoy to murder witnesses of his presence in Hong Kong, it is clear Attinger is merely a StrawHypocrite out to get rich.

* [[PhysicalGod Unicron]] is the BiggerBad in the ''Transformers'' verse, and exists as a multiversal singularity, traveling across dimensions in pursuit of his goal: the eradication of not only all life, but all existence from the multiverse, leaving only a swirling void centered around himself. With that goal in mind, Unicron has [[PlanetEater devoured numerous planets]], scouring the life from them, made frequent attempts to destroy Cybertron (actually his [[CainAndAbel brother Primus]]), formed {{cult}}s centered about [[ReligionOfEvil his worship]], and recruited numerous beings, often against their will, to serve as his Heralds (at one point having his servants Hook, Line, and Sinker torture a future version of Galvatron until he agreed to serve Unicron). To pick a few examples: Manifesting in the G1 verse, Unicron devoured the planet Lithone, forced that world's Megatron into serving him in exchange for his life, transforming him into Galvatron, and launched an assault on Cybertron that left many Autobots and Decepticons alike dead. Appearing in a ''Transformers''/''GIJoe'' crossover, Unicron destroyed the nation of Japan, before being driven off. In the 3H timeline, he kidnapped Transformers from across the galaxy and forced them to battle to the death within his body, draining their lives from them in the process. Appearing in the ''Armada'' verse, Unicron utilized his Herald, Sideways, to escalate the Autobot/Decepticon war, and made another attempt to destroy Cybertron. When this plan backfired, Unicron bodyjacked the resurrected Megatron/Galvatron and used him to further his own ends, which once again, included the extermination of all life on Cybertron. In the ''Cybertron'' comics, Unicron showed his disregard for even his most loyal followers, killing several of them once they [[YouHaveOutlivedYourUsefulness outlived their usefulness]], while setting in motion a plan to slay all versions of Primus across the multiverse, and reduce all existence to chaos. As of his most recent appearance, in the ''Transformers Prime'' continuity, Unicron, this time depicted as the Core of the planet Earth itself, tried to wipe all human life after declaring them - essentially [[OffingTheOffspring his own progeny]] - to be parasites. [[CompleteImmortality Immortal]], [[TheOmniscient omniscient]], and [[OmnicidalManiac omnicidal]], Unicron remains the single greatest threat to all life in the ''Transformers'' universe.
* [[TheAntichrist Megatronus Prime]] is known to all and sundry as [[FallenAngel The Fallen]]. If Unicron is the UltimateEvil, than The Fallen is [[{{Satan}} his Archangel Lucifer]], and like his master, exists as a single, dimension-spanning being who exists across all continuities simultaneously. Created by Primus as one of the original Thirteen Primes, [[FallenHero The Fallen]] became obsessed with the notions of [[OmnicidalManiac entropy and decay]], ultimately attempting to murder his creator after [[FaceHeelTurn betraying him]] to Unicron. Escaping the [[SealedEvilInACan prison he was trapped]] in some seven million years before the 21st century, The Fallen visited the G1 continuity, gathered several Decepticon outcasts and kidnapped four Transformers, through which he tried to channel enough energy to break the Seal of Primus, awaken Unicron, and end all reality, boasting that his victims were but "[[AGodAmI casualties in the wars of the Gods]]." Defeated, The Fallen, reappeared in the film verse, where he betrayed the other Primes in the name of fueling his own ego, and traveled world to world, destroying life and assimilating technology into himself. He successfully [[CainAndAbel murdered the other Primes]], but was trapped on Earth by the last of his brothers. Even then, he still managed to [[TheCorrupter corrupt]] this universe's Megatron, turning him to evil, and starting the Autobot/Decepticon war. Eventually freed and healed by Megatron, The Fallen sank an aircraft carrier, attacked several human cities, and slaughtered a sizable military force in his quest to claim the All Spark for himself. Sharing his master's unique nature, and his unquenchable thirst for destruction, [[TheDragon The Fallen]] is precisely the kind of servant that [[GodOfEvil Unicron]] most needs.