History Monster / Transformers

* ''[[Film/TransformersAgeOfExtinction Age of Extinction]]'' [[note]]See [[Franchise/TransformersAlignedUniverse Aligned Universe]] for ''[[VideoGame/TransformersRiseOfTheDarkSpark Rise of the Dark Spark]]''[[/note]]: [[StrawHypocrite 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. Attinger entered a deal between himself, [[BountyHunter 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. [[NotSoWellIntentionedExtremist Despite his rhetoric]], Attinger's actions and the consequences of said actions--having Cade Yeager's daughter Tessa threatened and causing possibly millions of human deaths through the Seed—-prove him to be driven only by his {{greed}} and [[FantasticRacism hatred of Transformers]].

* {{Crossover}}s with ''Franchise/GIJoe'':
** ''ComicBook/TransformersGIJoe'':
*** [[BigBad Cobra Commander]] is the leader of Cobra in the [=1930s=], here interpreted as a [[ANaziByAnyOtherName stand-in for the Nazi regime]] and all the evil that involves. Enslaving the Decepticons to his will after slaughtering a monastery they were slumbering in, the psychopathic Commander forces them to lay waste to cities across Europe, with any survivors of the bloody massacres--even children--being thrown into slave camps or used as {{human shield}}s. The Commander forces Shockwave to exhaust all of his energy in bombing his foes, uncaring that he's killing most of his slave labor while remarking "that's what they're for", after which Cobra Commander proclaims his intent to [[TakeOverTheWorld overrun the world]] with his tyrannical rule and [[AGodAmI institute himself as a god]], deciding on a whim who lives and dies under his megalomaniacal boot.
*** [[TortureTechnician Anastasia DeCobray]], TheBaroness, is the Nazi-esque Cobra's highest ranked leader except Cobra Commander himself, and matches her commander in cruelty. A vile {{sadist}} who enjoys torturing prisoners with tools thousands of years old, the Baroness subjects the G.I. Joe member Flint to such agony and seemingly kills him in the process. Always advocating for Cobra's more horrible crimes, the Baroness eventually initiates her master plan alongside her lover Destro, murdering their ally Starscream and unleashing the monstrous Bruticus to wipe out enemy, foe, and innocent alike in a bloody massacre. Personally [[TheStarscream betraying and killing the Commander himself]], the Baroness then reveals her intent to [[ChronicBackstabbingDisorder kill even Destro]], hoping to consolidate her own power once everyone who could rival her is dead.
** ''ComicBook/GIJoeVsTheTransformers'':
*** ''[[https://tfwiki.net/wiki/G.I._Joe_vs._the_Transformers_II G.I. Joe vs. the Transformers II]]'', written by Dan Jolley: [[BigBad Shockwave]] is a coldly ruthless Decepticon who assumed control of Cybertron after the disappearances of Optimus Prime and Megatron, and now [[EvilOverlord rules it with an iron fist]], crushing any rebellion against him. Scheming to invade Earth, Shockwave successfully turns the planet into a warzone, killing billions of humans and keeping countless more as slave labor who he routinely executes by the dozen when they fall behind in their workloads. When the past is altered and Earth is saved from this invasion, Shockwave instead attempts to bring about a time fracture upon Earth, bathing the planet in nuclear fire for decades and [[OmnicidalManiac wiping out all life on the planet]] so he can then gut the planet of its resources, and planning to keep human survivors as [[PlayingWithSyringes experiments for him to vivisect]].
*** ''[[https://tfwiki.net/wiki/G.I._Joe_vs._the_Transformers:_Black_Horizon Black Horizon]]'', written by Tim Seeley: [[GreaterScopeVillain Unicron]] is the Chaos Bringer, a planet-sized Transformer that [[PlanetEater devours entire planets]] and keeps thousands of survivors as [[AndIMustScream tortured, mind-altered slaves inside his body]] until they die and he replaces them with new victims. Having devoured countless planets over millennia, Unicron struck a deal with Cobra-La on Earth that he would spare the planet for a few centuries until there were billions of humans populating it, at which point Unicron would return and consume them all, leaving the barren husk for Cobra-La to rule. When the G.I. Joes and Transformers try to stop Unicron as he causes natural disasters worldwide and kills countless people, Unicron sics his "antibodies" on them, gleefully boasting his plans to slowly [[ToServeMan eat them all alive]] in the same fell swoop that he consumes Earth.
*** [[TheHeavy Golobulus]], also from ''Black Horizon'', is Unicron's agent on Earth, ruling over Cobra-La and using his forces to scheme for Unicron's return. Capturing and twisting several Transformers into his monstrous slaves, Golobulus uses them to slaughter anyone who tries to uncover his plans, and even takes humans captive to be kept as tortured pets. [[BadBoss Threatening and abusing his own people]] should [[YouHaveFailedMe they fail him]], Golobulus, [[MisanthropeSupreme believing humanity to be a blight upon the Earth]], summons Unicron to Earth to wipe out the entire race so that himself and Cobra-La can reign over the planet, and tries to brutally kill the G.I. Joe soldier Firewall as a "sacrifice" to Unicron in celebration of the [[KillAllHumans genocide of humanity]].

* ''ComicBook/StarTrekVsTransformers'': Megatron is once again portrayed as a power-mad tyrant. With the Autobots fleeing Earth with the breakout of WorldWarIII, Megatron and the Decepticons pursue them, resulting in a battle where both sides end up in stasis on a remote planet. Centuries later, a Federation mining team accidentally revives the Autobots and the Decepticons, resulting in the Decepticons attacking the Federation mining colony. Optimus Prime and the Enterprise crew team up and drive off the Decepticons, but Megatron meets and teams up with the Klingons. The Klingons and Decepticons renew their attack on the Federation mining colony, not caring how many Federation colonists die in these attacks. When Starscream flees to Kronos to conquer it, Megatron and the Decepticons pursue Starscream to Kronos. Megatron defeats Starscream and claims Kronos for himself so that he can [[SlaveryIsASpecialKindOfEvil enslave the Klingons]] and use their resources to launch a war of conquest against the Federation. [[ProudWarriorRaceGuy When the Klingons refuse to surrender]], Megatron orders his forces [[FinalSolution to annihilate all the Klingons]].
* ''[[https://tfwiki.net/wiki/Transformers_vs._The_Terminator Transformers vs. The Terminator]]'': [[BigBad Megatron]], upon being awaken by Skywarp, proceeds to wipe out the Autobots while they are still offline, and decides to [[TakeOverTheWorld conquer Earth]]. Declaring war upon humanity, Megatron leads the Decepticons in annihilating entire human armies, forcing humanity to create [[Franchise/{{Terminator}} Skynet]] in their attempt to survive. Successfully [[KillAllHumans wiping out humanity]] and enslaving Terminators, Megatron orders Stascream to destroy Skynet when he discovered that it was plotting against him. Despite [[AdaptationalHeroism Skynet]] succeeding in sending one of its Terminators into the past to prevent Megatron from winning, Megatron still managed to awaken in the past and once again attempts to wipe out the Autobots, while leading the Decepticons in attacking innocent humans.

[[AC:Other Continuities (by release date)]]

* ''[[Anime/TransformersRobotsInDisguise Robots in Disguise]]'' (dub only): [[EvilOverlord Megatron]] is the [[BigBad leader of the Predacons]], who arrived on Earth in search of the Autobot Weapon Fortress Maximus under the pretext of raiding Earth for its energy. Upon arrival, he kidnaps Doctor Kenneth Onishi and probes his mind to find the location of Fortress Maximus. After receiving knowledge of the Autobot Protoforms, Megatron corrupts their sparks in order to create his Decepticons. Although initially AFatherToHisMen to his minions if they prove themselves worthy of respect, he [[BadBoss discards these qualities]] upon his rebirth as the Decepticon [[VileVillainSaccharineShow Galvatron]]--absorbing the energies of the Predacon Brothers against their will to power his new body immediately upon his transformation, and later reducing Scourge and the Decepticons to mindless drones for plotting to overthrow him with the use of Fortress Maximus. Galvatron's worst actions, however, came during the finale when, after surviving a battle with Fortress Maximus, he transforms into bat form and drains Fortress Maximus's energy to power himself. He then unleashes his bat swarm to brainwash human children with the goal of enslaving them and repeating the process from planet to planet until he has conquered the universe, [[WouldHurtAChild threatening to harm the children]] if Omega Supreme or the Autobots intervene. When the Autobots flee into the Space Bridge, Galvatron sends the Decepticons to pursue with the intention of destroying both groups by collapsing the Space Bridge, not caring if any Predacon gets caught in the collapse, [[ItsAllAboutMe all so he could have the entire planet to himself]].
* ''Anime/UnicronTrilogy'':
** [[GreaterScopeVillain Unicron]] is a powerful and ancient Transformer who feeds upon [[PlanetEater worlds]] and the [[EmotionEater negative emotions]] of others. Disguising himself as one of Cybertron's moons, Unicron created the Mini-Cons to escalate the war between the Autobots and the Decepticons. Hoping to consume both sides once he regained enough power from their conflict, Unicron's plans were foiled when the Mini-Cons gained free will and abandoned Cybertron. Once fully awakened, Unicron attacked Cybertron, killed Starscream, and briefly stripped the Mini-Cons of their free will. After being defeated, Unicron returned by devouring the home world of Alpha Q and all of its inhabitants. When Megatron revived him, in hopes of turning him into a weapon, [[EvilIsNotAToy Unicron possessed Megatron]] and went off to [[OmnicidalManiac destroy several planets]] that Alpha Q had managed to restore.
** [[BigBad Megatron]], later known as Galvatron, is the brutal commander of the Decepticons. Desiring to destroy the Autobots and conquer the universe, Megatron enslaves Mini-Cons, tries to kill the Autobots' human allies, and tries to destroy Earth with the Hydra Cannon. Upon his resurrection, Megatron leads his forces in destructive raids for Energon. Megatron plans to use the element to revive Unicron and use him as a weapon. Megatron uses Unicron's power to [[BadBoss subvert the wills of his followers]], notably enslaving Scorponok and Starscream. Developing [[AGodAmI a god complex]], Megatron seeks to use the Cyber Planet Keys to accelerate the Unicron Singularity's expansion to [[OmnicidalManiac end reality]] and reconstruct it [[InTheirOwnImage in his own image]].

** [[AxCrazy Ultra Magnus]] was locked up in his universe for trying to usurp Optimus Prime, getting his face ripped off in the process. He and several others travel to earth, where he assimilates numerous Autobots into the Junkion hordes, resulting in them 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 [[OmnicidalManiac cause the death of the entire universe]]. Even the normal Decepticons turned against him, as they wanted to be the conquerors, and [[EvenEvilHasStandards were appalled]] when they realized the extent of the damage.

* ''Film/{{Bumblebee}}'': [[BigBadDuumvirate Shatter and Dropkick]] are a pair of Decepticons out to hunt down and kill Optimus Prime. [[EstablishingCharacterMoment Introduced]] torturing and murdering the Autobot Cliffjumper, the two arrive on earth where Dropkick kills a human simply [[ForTheEvulz for fun]]. Directed to the human authorities, the two claim to be peacekeepers hunting down a criminal to give them access to humanity's satellites. After capturing and torturing Bumblebee, the two murder a doctor who was helping them, revealing their intent to bring their forces down on Earth and [[KillAllHumans kill every human being]], not stopping until the planet is a cinder. A vicious pair of BrainsAndBrawn, Shatter and Dropick embody the worst of the Decepticons.

** [[BigBad Megatron]] is the cruel, charismatic leader of the Decepticons, leading his faction in the complete and total subjugation of Cybertron. Though starting out with noble intentions to liberate his people from their laborious lives as gladiators and miners, Megatron [[JumpingOffTheSlipperySlope succumbed to his own thirst for blood and power]], and went on to murder his mentor Alpha Trion, torture and kill his old friend Ultra Magnus, and wage a terrible war on the Autobots that claimed countless innocent lives. Upon assuming control of Cybertron, Megatron forces all Autobots to surrender or die, displaying their corpses as trophies while [[CannonFodder treating even his own Decepticon troops as expendable]]. Ultimately planning to commit utter genocide against the Autobots through either slaughter or reformatting their minds, Megatron's evil only increases when he [[BadBoss sacrifices hundreds of Decepticons]] by having their sparks ripped from their bodies to power his ''Nemesis'' project, and later takes advantage of Optimus Prime's mercy to gleefully backstab and try to kill his former friend and the rest of the Autobots, showing that [[NotSoWellIntentionedExtremist underneath any supposed standards, Megatron is a selfish, callous monster]].
** [[MadScientist Shockwave]] is a cold, clinical scientist and the most wicked of Megatron's inner circle, with no crime he considers beneath him. Researching the history of Cybertron, Shockwave discovers the power of the mythical Allspark and reveals to his master a devious plan: to use its power in order to spread a virus in order to forcefully reformat all Autobots into Decepticons, turning them into mindless slaves, and steers his boss into using this plan. After the Decepticons capture Ultra Magnus, Shockwave [[ElectricTorture electrically tortures]] him until his body starts to break apart from the pain and sheer force. With Magnus's death, Shockwave [[DesecratingTheDead uses his body]] as way to cultivate and release a computer virus which will wreak havoc on the Autobots communications, despite the fact that it would lead to chaos all across Cybertron. Shockwave later lures in and sacrifices hundreds of Decepticons to use their [[HumanResources bodies]] and [[YourSoulIsMine sparks]] as raw parts to build the spaceship ''Nemesis'' while secretly devouring several sparks himself to increase his power for his plans.
* ''ComicBook/TransformersBackToTheFuture'': AlternateTimeline Megatron is as per usual a brutal tyrant. Due to the manipulations of a time-traveling Rumble, Megatron and all the other Decepticons were awakened prematurely. Megatron would [[HeroKiller kill off Optimus Prime]], and without him to stand in his way, Megatron quickly [[TakeOverTheWorld conquered the world]], killing most of the Autobots and forcing the rest underground. Megatron would also [[UngratefulBastard murder Rumble]] for seemingly no reason and used Biff Tannen to enslave all of Hill Valley, where the population would be forced to mine for energon. Megatron would also murder them whenever they failed to meet his quotas, as well as killing anyone who opposed him. By 2015 Megatron's sheer level of cruelty eventually got so bad that it caused Gigawatt to turn on him. Megatron attacked him, intending to kill him, but Gigawatt was able to escape just in time.

** [[InsaneAdmiral General Robert Hallo]] was the head of military development for the United States Army. Obsessed with the idea of controlling the Transformers, Hallo had Adam Rook create a program that could remove the free will from Transformers, and hatched a plan to blow up the ''Ark II'' and gain a new robot army. After [[HeKnowsTooMuch killing a man who attempted to blow the whistle on the plan]], Hallo successfully destroyed the ''Ark II'', killing all the humans on board and sending the Autobots and captured Decepticons into the Arctic Ocean. However, Adam decided to keep the program for himself, and disappeared not long after. Years later, after discovering Rook has been using the program to build a criminal empire, Hallo convinced Spike Witwicky to revive Optimus Prime. However, when showed that he had free will and refused to follow Hallo's orders, he had Optimus, his Autobots and the Decepticons hit with an air strike, intending to kill them all. Unfortunately for Hallo, not only did they survive, an enraged group of Decepticons began rampaging through San Francisco. To be rid of the Transformers once and for all, Hallo ordered the city to be nuked, and when Spike burst in to stop him, Hallo holds him at gunpoint and [[ForcedToWatch forces him to watch]] as the city and Transformers are destroyed. When Spike accused him of only caring about power, [[CardCarryingVillain Hallo agreed with him]], saying power is the only thing keeping [[KnightTemplar Spike and his family safe]].

* ''[[WesternAnimation/TransformersRobotsInDisguise Robots in Disguise]]'': [[GreaterScopeVillain Megatronus]], once a member of the Thirteen Primes, was locked away for betraying his comrades and murdering Solus Prime. [[LeakingCanOfEvil Still having influence outside of his prison]], Megatronus causes the Decepticon prison transport ship, ''The Alchemor'', to crash on Earth, unleashing dozens of Decepticons on the planet. Contacting [[BigBad Steeljaw]], Megatronus manipulates him into releasing him from his prison, and uses his psychic powers to force one of Steeljaw's soldiers to begin amputating his own arm to convince Steeljaw to work faster. When unleashed from his prison, Megatronus betrays Steeljaw, tries to murder both him and the Autobots attempting to thwart him, and reveals he plans to use the power of Unicron and the Allspark to [[OmnicidalManiac destroy both Earth and Cybertron in one fell swoop]] as revenge for his imprisonment. [[FaceHeelTurn Perhaps once a good person]], Megatronus shed any heroic traits and replaced them with pure sociopathy and blind hatred.

-->-- '''Megatron''', after trying to murder Optimus Prime and rewrite history, ''WesternAnimation/BeastWars'', "[[Recap/BeastWarsS2E13TheAgendaPart3 The Agenda, Part 3]]"

** ''ComicBook/TransformersGIJoe'', written by John Ney Rieber: [[BigBad Cobra Commander]] continues to prove himself capable of being an irredeemable psychopath when it comes to adaptations of his [[WesternAnimation/GIJoeARealAmericanHero original iteration]]. With Cobra serving as [[ANaziByAnyOtherName a stand-in for the Nazi Party]], Commander runs his empire with the same cruel egomania that the Nazis were known for. After discovering the Decepticons hidden in an ancient monastery whose inhabitants he has just had slaughtered, Commander forcefully takes control of the Decepticons and forces them to lay waste to numerous countries across Europe, including Berlin and Rome. Any survivors of these massacres, including the children, are forced into slave camps, and, later, used as {{human shield}}s against the Commander's enemies. After forcing a Decepticon to exhaust all his energy in wantonly laying waste to enemies and allies alike, the Commander reveals his plan to use the Decepticons to institute a new world order under his rule where only the strong will survive and serve under his thumb. Cobra Commander is a megalomaniac whose status as a stand-in for [[UsefulNotes/AdolfHitler the Nazi leadership]] makes him one of the most realistic, and wicked, baddies throughout the ''G.I. Joe'' franchise.

** [[BigBad Megatron]] is a 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, [[WeHaveReserves considers his own allies 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; unsuccessfully ordering Dinobot to kill Quickstrike, one of Megatron's relatively more loyal soldiers, after Quickstrike lost to Dinobot in a sort of re-entrance exam into the Predacons; 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 [[OmnicidalManiac 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.

** [[EvilDoppelganger Megatron X]], aka the Other One, is a Megatron from an alternate universe where he took the fateful decision of murdering his former friend Optimus Prime and claiming his Matrix of Leadership early in the war. With Prime gone, Megatron X proceeded to kill all the Autobots and use the [=AllSpark=] to create his mindless army of "[[MechaMooks Perfect Decepticons]]". After gaining his perfect army, Megatron X [[YouHaveOutlivedYourUsefulness exterminated his "unneeded" Decepticons]] and [[BadBoss tormented the survivors Astrotrain and the Insecticons]] so much that they would rather flee to other universes than live under his rule. When the multiverse-hopping Megatron steals his Matrix to stop the Quintesson invasion in present-day, Megatron X pursues his doppelgänger with extreme prejudice, eventually catching up to him in the main universe. He kills Megatron with ease, [[PretenderDiss calling him unworthy and a failure to his name]], and relishes to repeat his genocide of Autobots and Decepticons all over again in this universe. Feared and hated by everyone, Megatron X is what Megatron would have been without honor or respect for Optimus Prime.

** ''[[https://tfwiki.net/wiki/Transformers/G.I._Joe Transformers/G.I. Joe]]'', written by John Ney Rieber: [[BigBad Cobra Commander]] continues to prove himself capable of being an irredeemable psychopath when it comes to adaptations of his [[WesternAnimation/GIJoeARealAmericanHero original iteration]]. With Cobra serving as [[ANaziByAnyOtherName a stand-in for the Nazi Party]], Commander runs his empire with the same cruel egomania that the Nazis were known for. After discovering the Decepticons hidden in an ancient monastery whose inhabitants he has just had slaughtered, Commander forcefully takes control of the Decepticons and forces them to lay waste to numerous countries across Europe, including Berlin and Rome. Any survivors of these massacres, including the children, are forced into slave camps, and, later, used as {{human shield}}s against the Commander's enemies. After forcing a Decepticon to exhaust all his energy in wantonly laying waste to enemies and allies alike, the Commander reveals his plan to use the Decepticons to institute a new world order under his rule where only the strong will survive and serve under his thumb. Cobra Commander is a megalomaniac whose status as a stand-in for [[UsefulNotes/AdolfHitler the Nazi leadership]] makes him one of the most realistic, and wicked, baddies throughout the ''G.I. Joe'' franchise.

** [[Creator/IDWPublishing IDW comic]]: [[BigBad The Fallen]] himself is portrayed as even worse than his film counterpart. Once a member of the Thirteen Primes, The Fallen came to believe [[AGodAmI he was destined to become the most powerful of his brothers]] by re-powering the Allspark, then using it to make himself all-powerful. Using the Star Harvester, The Fallen drains the energy from a sun, uncaring that it leads to an entire planet dying, and blames it on one of his own servants when confronted about it. After attempting to use the Star Harvester once more, The Fallen comes to the realization that he no longer needs his Prime "brothers" or the Allspark, prompting instead to travel the universe searching for sentient life, then [[OmnicidalManiac slaughtering countless worlds of their sentient species]], [[TheCollector absorbing the knowledge, weapons, and strategies]] of the billions he slays as he goes along. After butchering his Prime brothers, The Fallen attempts to use the Star Harvester to [[EarthShatteringKaboom wipe out the entire Earth]], [[{{Sadist}} taking extra time to crush humans underfoot while laughing]]. Though [[SealedEvilInACan sealed away for thousands of years]], The Fallen continues his wicked ways, as he [[TheManBehindTheMan reaches out]] and [[TheCorrupter corrupts]] the noble Megatron into waging a war against Optimus Prime and the Autobots, leading to countless deaths and the destruction of Cybertron itself. The Fallen hopes to return to Earth and use the Star Harvester to destroy it for good this time, solely as a final act of spite toward his brothers.

** ''Beast Hunters'' comic: [[TheSocialDarwinist Airwave]], from the first two issues, is an Autobot, who after the Great Civil War [[FaceHeelTurn abandoned the Autobots' ideals]] in favor of an "everyone out for himself" philosophy, due to believing that Optimus Prime and the others left them to die on Cybertron. Forming one of the Autobots cities underground, called Lost Spark, Airwave found an easy way to get Energon for himself by secretly killing his own followers and then draining their bodies of Energon in the morgue. Thus killing several dozen of his own people and closest friends, Airwave planned to feast on all inhabitants on the Lost Spark, until he was discovered by Sludge and Snarl, after which he shot Firestar in the back and framed them for it, leading to his followers attacking them. Trying to kill Sludge and Snarl, Airwave didn't care when he killed dozens of his own people in the crossfire.

** [[EvilDoppelganger Megatron X]], aka the Other One, is a Megatron from an alternate universe where he took the fateful decision of murdering his former friend Optimus Prime and claiming his Matrix of Leadership early in the war. With Prime gone, Megatron X proceeded to kill all the Autobots and use the [=AllSpark=] to create his mindless army of "[[MechaMooks Perfect Decepticons]]". After gaining his perfect army, Megatron X [[YouHaveOutlivedYourUsefulness exterminated his "unneeded" Decepticons]] and [[BadBoss tormented the survivors Astrotrain and the Insecticons]] so much that they would rather flee to other universes than live under his rule. When the multiverse-hopping Megatron steals his Matrix to stop the Quintesson invasion in present-day, Megatron X pursues his doppelgänger with extreme prejudice, eventually catching up to him in the main universe. He kills Megatron with ease, [[PretenderDiss calling him unworthy and a failure to his name]], and relishes to repeat his genocide of Autobots and Decepticons all over again in this universe. Feared and hated by everyone, Megatron X is what Megatron would have been without honor or respect for Optimus Prime.

** [[EvilDoppelganger Megatron X]], aka the Other One, is a Megatron from an alternate universe where he took the fateful decision of murdering his former friend Optimus Prime and claiming his Matrix of Leadership early in the war. With Prime gone, Megatron X proceeded to kill all the Autobots and use the [=AllSpark=] to create his mindless army of "[[MechaMooks Perfect Decepticons]]". After gaining his perfect army, Megatron X [[YouHaveOutlivedYourUsefulness exterminated his "unneeded" Decepticons]] and [[BadBoss tormented the survivors Astrotrain and the Insecticons]] so much that they would rather flee to other universes than live under his rule. When the multiverse-hopping Megatron steals his Matrix to stop the Quintesson invasion in present-day, Megatron X pursues his doppelgänger with extreme prejudice, eventually catching up to him in the main universe. He kills Megatron with ease, [[PretenderDiss calling him unworthy and a failure to his name]], and relishes to repeat his genocide of Autobots and Decepticons all over again in this universe. Feared and hated by everyone, Megatron X is what Megatron would have been without honor or respect for Optimus Prime.

* ''WesternAnimation/TransformersWarForCybertronTrilogy'' (''Siege''):
** [[BigBad Megatron]] is the cruel, charismatic leader of the Decepticons, leading his faction in the complete and total subjugation of Cybertron. Though starting out with noble intentions to liberate his people from their laborious lives as gladiators and miners, Megatron soon enough [[JumpingOffTheSlipperySlope succumbed to his own thirst for blood and power]], and went on to murder his mentor Alpha Trion, torture and kill his old friend Ultra Magnus, and wage a terrible war on the Autobots that claimed countless innocent lives. Upon assuming control of Cybertron, Megatron forces all Autobots to surrender or die, letting their corpses be displayed as twisted trophies, all while treating his own troops as [[CannonFodder disposable]], [[BadBoss nearly murdering them just for talking back and casually ordering the loyal Jetfire murdered for protecting the Autobots]]. Ultimately planning to commit utter genocide against the Autobots, Megatron has Shockwave unleash a virus that throws all of Cybertron into chaos, and intends to use the Allspark to reformat and destroy the minds of every last Autobot, cementing to all that his supposedly peaceful intentions are a mask to hide his [[NotSoWellIntentionedExtremist selfish, depraved desire to reign over all he sees]].
** [[MadScientist Shockwave]] is a cold, clinical scientist and the most wicked of Megatron's inner circle, with no crime he considers beneath him. Researching the history of Cybertron, Shockwave discovers the power of the mythical Allspark and reveals to his master a [[EvilPlan devious plan]]: to use its power in order to spread a virus in order to forcefully reformat all Autobots into Decepticons, turning them into mindless slaves, and steers his boss into using this plan. After the Decepticons capture Ultra Magnus, Shockwave [[ElectricTorture electrically tortures]] him until his body starts to break apart from the pain and sheer force. With Magnus's death, Shockwave [[DesecratingTheDead uses his body]] as way to cultivate and release a ComputerVirus which will wreak havoc on the Autobots communications, despite the fact that it would lead to chaos all across Cybertron.

* ''ComicBook/StarTrekVsTransformers'', by John Barber, Mike Johnson, et al.: Megatron is once again portrayed as a power-mad tyrant. With the Autobots fleeing Earth with the breakout of WorldWarIII, Megatron and the Decepticons pursue them, resulting in a battle where both sides end up in stasis on a remote planet. Centuries later, a Federation mining team accidentally revives the Autobots and the Decepticons, resulting in the Decepticons attacking the Federation mining colony. Optimus Prime and the Enterprise crew team up and drive off the Decepticons, but Megatron meets and teams up with the Klingons. The Klingons and Decepticons renew their attack on the Federation mining colony, not caring how many Federation colonists die in these attacks. When Starscream flees to Kornos to conquer it, Megatron and the Decepticons pursue Starscream to Kornos. Megatron defeats Starscream and claims Kornos for himself so that he can [[SlaveryIsASpecialKindOfEvil enslave the Klingons]] and use their resources to launch a war of conquest against the Federation. [[ProudWarriorRaceGuy When the Klingons refuse to surrender]], Megatron orders his forces [[FinalSolution to annihilate all the Klingons]].

** [[EvilDoppelganger Megatron X]], aka the Other One, is a Megatron from an alternate universe where he took the fateful decision of murdering his former friend Optimus Prime and claiming his Matrix of Leadership early in the war. With Prime gone, Megatron X proceeded to kill all the Autobots and use the [=AllSpark=] to create his mindless army of "[[MechaMooks Perfect Decepticons]]". After gaining his perfect army, Megatron X [[YouHaveOutlivedYourUsefulness exterminated his "unneeded" Decepticons]] and [[BadBoss tormented the survivors Astrotrain and the Insecticons]] so much that they would rather flee to other universes than live under his rule. When the multiverse-hopping Megatron steals his Matrix to stop the Quintesson invasion in present-day, Megatron X pursues his doppelgänger with extreme prejudice, eventually catching up to him in the main universe. He kills Megatron with ease, [[PretenderDiss calling him unworthy and a failure to his name]], and relishes to repeat his genocide of Autobots and Decepticons all over again in this universe. Feared and hated by everyone, Megatron X is what Megatron would have been without honor or respect for Optimus Prime.

* ''[[WesternAnimation/StarTrekTheAnimatedSeries Star Trek]] vs. [[WesternAnimation/TheTransformers Transformers]]'', by John Barber, Mike Johnson, et al.: Megatron is once again portrayed as a power-mad tyrant. With the Autobots fleeing Earth with the breakout of WorldWarIII, Megatron and the Decepticons pursue them, resulting in a battle where both sides end up in stasis on a remote planet. Centuries later, a Federation mining team accidentally revives the Autobots and the Decepticons, resulting in the Decepticons attacking the Federation mining colony. Optimus Prime and the Enterprise crew team up and drive off the Decepticons, but Megatron meets and teams up with the Klingons. The Klingons and Decepticons renew their attack on the Federation mining colony, not caring how many Federation colonists die in these attacks. When Starscream flees to Kornos to conquer it, Megatron and the Decepticons pursue Starscream to Kornos. Megatron defeats Starscream and claims Kornos for himself so that he can [[SlaveryIsASpecialKindOfEvil enslave the Klingons]] and use their resources to launch a war of conquest against the Federation. [[ProudWarriorRaceGuy When the Klingons refuse to surrender]], Megatron orders his forces [[FinalSolution to annihilate all the Klingons]].

** [[EvilDoppelganger Megatron X]], aka the Other One, is a Megatron from an alternate universe where he took the fateful decision of murdering his former friend Optimus Prime and claiming his Matrix of Leadership early in the war. With Prime gone, Megatron X proceeded to kill all the Autobots and use the [=AllSpark=] to create his mindless army of "[[MechaMooks Perfect Decepticons]]". After gaining his perfect army, Megatron X [[YouHaveOutlivedYourUsefulness exterminated his "unneeded" Decepticons]] and [[BadBoss tormented the survivors Astrotrain and the Insecticons]] so much that they would rather flee to other universes than live under his rule. When the multiverse-hopping Megatron steals his Matrix to stop the Quintesson invasion in present-day, Megatron X pursues his doppelgänger with extreme prejudice, eventually catching up to him in the main universe. He kills Megatron with ease, [[PretenderDiss calling him unworthy and a failure to his name]], and relishes to repeat his genocide of Autobots and Decepticons all over again in this universe. Feared and hated by everyone, Megatron X is what Megatron would have been without honor or respect for Optimus Prime.

** [[EvilDoppelganger Megatron X]], aka the Other One, is a Megatron from an alternate universe where he took the fateful decision of murdering his former friend Optimus Prime and claiming his Matrix of Leadership early in the war. With Prime gone, Megatron X proceeded to kill all the Autobots and use the [=AllSpark=] to create his mindless army of "[[MechaMooks Perfect Decepticons]]". After gaining his perfect army, Megatron X [[YouHaveOutlivedYourUsefulness exterminated his "unneeded" Decepticons]] and [[BadBoss tormented the survivors Astrotrain and the Insecticons]] so much that they would rather flee to other universes than live under his rule. When the multiverse-hopping Megatron steals his Matrix to stop the Quintesson invasion in present-day, Megatron X pursues his doppelgänger with extreme prejudice, eventually catching up to him in the main universe. He kills Megatron with ease, [[PretenderDiss calling him unworthy and a failure to his name]], and relishes to repeat his genocide of Autobots and Decepticons all over again in this universe. Feared and hated by everyone, Megatron X is what Megatron would have been without honor or respect for Optimus Prime.

** The aforementioned Adam Rook is also known as Lazarus. After designing a program that would [[SlaveryIsASpecialKindOfEvil remove the free will from Transformers]], he decided to render the deaths of everyone aboard the ''Ark II'' meaningless by stealing the program and disappearing before Hallo had a chance to use it. Motivated by {{greed}}, Rook took the name Lazarus and built a criminal empire, using the program to [[ArmsDealer force Transformers to work for dictators and terrorists]], helping them stomp out their enemies without casualties on their side. He even forced good guys like Bumblebee, Ratchet and Ironhide to work for killers. Sometimes, he would take "customers" on tours of his base, and would make the Transformers kneel to him to show his power over them. After three years of running this successful criminal empire, Lazarus had a group of Transformers slaughter an oil refinery in the Arctic as a demonstration to potential buyers, and [[LackOfEmpathy casually began auctioning off all of them not long after]].

** ''G.I. Joe vs. the Transformers'' (Devil's Due Publishing series):

** The aforementioned [[ArachnidAppearanceAndAttire Airachnid]] is a self-styled "ex-Decepticon" who spent her time in the Great War capturing, torturing, and slowly killing any Autobots she could find [[ForTheEvulz for fun]]. 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: [[EgomaniacHunter hunting endangered and soon-to-be extinct species]]—or species [[OmnicidalManiac she will make extinct]]--for sport and collecting grisly "trophies" of her kills. Should she find an attractive species that isn't endangered, she'll ensure that they are by the time she's done, deciding to make humans her new toys, starting with the teenage Jack Darby. Forced back into serving Megatron, Airachnid barely hides her dissatisfaction, [[TheStarscream trying to usurp control from Megatron at times]]. She finally breaks free when she finds an Insecticon hive, murders fellow Decepticon Breakdown along the way, and plans to use her new servants to destroy Megatron. Sadistic, merciless and terrifying while enjoying her atrocities, Airachnid is one of the worst to wear the Decepticon logo.

** The aforementioned [[BigBad Megatron]], later known as Galvatron, is the brutal commander of the Decepticons. Desiring to destroy the Autobots and conquer the universe, Megatron enslaves Mini-Cons, tries to kill the Autobots' human allies, and tries to destroy Earth with the Hydra Cannon. Upon his resurrection, Megatron leads his forces in destructive raids for Energon. Megatron plans to use the element to revive Unicron and use him as a weapon. Megatron uses Unicron's power to [[BadBoss subvert the wills of his followers]], notably enslaving Scorponok and Starscream. Developing [[AGodAmI a god complex]], Megatron seeks to use the Cyber Planet Keys to accelerate the Unicron Singularity's expansion to [[OmnicidalManiac end reality]] and reconstruct it [[InTheirOwnImage in his own image]].

** [[EvilDoppelganger Megatron X]], aka the Other One, is a Megatron from an alternate universe where he took the fateful decision of murdering his former friend Optimus Prime and claiming his Matrix of Leadership early in the war. With Prime gone, Megatron X proceeded to kill all the Autobots and use the [=AllSpark=] to create his mindless army of "[[MechaMooks Perfect Decepticons]]". After gaining his perfect army, Megatron X [[YouHaveOutlivedYourUsefulness exterminated his "unneeded" Decepticons]] and [[BadBoss tormented the survivors Astrotrain and the Insecticons]] so much that they would rather flee to other universes than live under his rule. When the multiverse-hopping Megatron steals his Matrix to stop the Quintesson invasion in present-day, Megatron X pursues his doppelgänger with extreme prejudice, eventually catching up to him in the main universe. He kills Megatron with ease, [[PretenderDiss calling him unworthy and a failure to his name]], and relishes to repeat his genocide of Autobots and Decepticons all over again in this universe. Feared and hated by everyone, Megatron X is what Megatron would have been without honor or respect for Optimus Prime.

!!''[[Franchise/TransformersGeneration1 Generation 1]]''

''[[AC:WesternAnimation/TheTransformers]]''
* [[PhysicalGod Unicron]], debuting in [[WesternAnimation/TheTransformersTheMovie the 1986 animated movie]], is an ancient [[PlanetEater planet-eating]] Transformer that was created by a MadScientist called Primacron. Primacron created Unicron to help him take over the universe, but he rebelled and destroyed Primacron's lab. Unicron travelled through space and devoured many inhabited worlds, including the planet of Lithone. After learning of Optimus Prime's death and his passing of the Matrix of Leadership, Unicron tracked down Megatron and tasked him to destroy it, as it was the only thing that could stand in his way. Torturing Megatron into accepting his deal, Unicron reformatted him into Galvatron and made him more susceptible to his psychic assaults. Galvatron, tired of being Unicron's pawn, tried to use the Matrix to turn Unicron into his slave, but it had no effect in his hands. In retaliation, Unicron started [[OmnicidalManiac destroying Cybertron and attacked both Autobot and Decepticon alike]]. Unicron was eventually defeated by a Matrix-wielding Rodimus and only his head remained to orbit Cybertron, a testament to the Transformer that made even the mighty Megatron beg for mercy.

''[[AC:[[Anime/TransformersSuperGodMasterforce Super-God Masterforce]]]]''
* [[BigBad Devil Z]] is the Decepticon Emperor. Stealing 8 Transtectors to create an army of humans merged with the power of Transformers, Devil Z later intended to cast aside the Godmasters as tools. Straight up DesecratingTheDead and later torturing his minions, Devil Z happily resorts to [[NeverMyFault blaming his minions]] when he makes an error or miscalculation. Later when humanity proves themselves to be unpredictable, Devil Z decides that humanity is an existential threat and that he must KillAllHumans. When [[EvenEvilHasStandards his own subordinates think he is going too far]], he kills them without hardly a second thought, and displays absolutely no remorse for his actions.

[[AC:Creator/MarvelComics continuity]]
* ''ComicBook/TheTransformers'':
** [[OmnicidalManiac Unicron]] is a powerful [[PlanetEater planet-eating]] Transformer and the ArchEnemy of Primus, the creator of the Cybertronians. Millions of years ago, Primus stopped Unicron's quest to consume all of existence by trapping him within a lifeless asteroid and left to wander aimlessly through space. When Primus was shot during a fight between the Autobots and Decepticons, Unicron heard his rival's scream of pain and made a direct path towards Cybertron. Stopping to devour the planet of Ghennix and its roughly 60 billion inhabitants, Unicron reformatted three of its survivors to be his new heralds. After sending them to retrieve Galvatron from the future, Unicron tortured him in order to gain his compliance. He distracted Primus's forces by siccing his [[ManchurianAgent sleeper agents]] that were planted within Cybertron's population millennia ago. Once he finally arrived, Unicron devastated Cybertron and claimed countless lives, including [[KillTheGod Primus's]]. Unicron's rampage left lasting scars on Cybertron's surface and truly earned him the title of the Chaos Bringer.
** [[TheCaligula Lord Straxus]] is a brutal Decepticon warlord who took over Cybertron after the departure of Megatron. During his reign, Straxus would have his troops round up any Cybertronian who did not pledge loyalty to the Decepticons and subject them to his smelting pools, where they would be melted down for spare parts while they were still alive. Upon receiving a transmission from Earth, Straxus had the neutral scientist Spanner kidnapped so he could build a space bridge for him. When the bridge started malfunctioning, Straxus [[BadBoss sent men after men to their deaths]] because he was too impatient to figure out what the problem was. He would then forcibly reconfigure Spanner's body to become part of the space bridge, [[FateWorseThanDeath leaving him in constant pain and begging for death]]. After being reduced to a severed head, Straxus [[GrandTheftMe intended to swap bodies with Megatron]] and crush him in his helpless state. When that plan failed, Straxus forcibly reformatted one of his soldiers into becoming a clone of Megatron and transferred his mind into their body. He would continue to torment the clone and eventually [[DrivenToSuicide drove him to suicide]] in his attempts to take over his body. Straxus dispensed no mercy to all sides of the conflict, and promised only death to those who stood in his way.
** [[MadScientist Flame]] is an Autobot scientist who was kicked out of his academy in disgrace after proposing a revival of Megatron’s plan to turn Cybertron into a mobile spacecraft. Bitter over his rejection, Flame ignored the warnings of his peers despite the danger his project posed to Cybertron. After discovering an abandoned engine room left behind by the Decepticons, Flame faked his death and continued his research in secrecy. When a test firing of the repaired engines destroyed a section of the city Kalis, Flame transmitted a signal that [[OurZombiesAreDifferent reanimated the corpses of his fellow Cybertronians]] and forced them to attack anyone who came close to the city. Flame refused to listen to the warnings of his former colleague, Emirate Xaaron, and tried to kill him when Xaaron attempted to shut down his reactor before it would destroy Cybertron. Flame [[LackOfEmpathy showed no remorse]] over turning the victims of his own hubris into his zombie slaves, and [[ItsAllAboutMe only cared about restoring the reputation he deservedly lost]].
* ''[[ComicBook/TransformersGeneration2 Generation 2]]'': [[VisionaryVillain Jhiaxus]] is the [[BigBad ruler]] of the Cybertronian Empire, but was [[FromNobodyToNightmare once just another Decepticon warlord]] on Cybertron. Believing the war between the Autobots and Decepticons was hindering the progress of their species, Jhiaxus abandoned his sadistic ways and left Cybertron with a legion of Decepticons. He led his empire on a campaign of conquest and genocide, [[HostileTerraforming terraforming new worlds]] and [[WouldBeRudeToSayGenocide wiping out any "inferior beings"]] that happened to get in their way. When the Autobots began attacking his outposts, Jhiaxus focused his efforts on eliminating this new threat to his empire. Declaring war on both the Autobots and Decepticons, Jhiaxus's cruel nature began resurfacing as he ordered the slaughter of numerous species to lure the Autobots out of hiding. He managed to track down the base of the Autobots and Decepticons, and [[WeHaveReserves sent wave after wave of his men]] to wipe them all out. When Optimus Prime warned him about the arriving threat of the Swarm, Jhiaxus ordered the destruction of San Francisco simply out of spite. Jhiaxus ordered a second strike that would kill his own men, and crushed the head of a soldier who suggested they retreat. Jhiaxus [[NeverMyFault blamed Optimus for his empire falling apart]] and refused to believe he was still just as much of a petty tyrant as he was back on Cybertron.
* ''[[http://web.archive.org/web/20070704093846/http://www.transforce.org.uk/alignment.pdf Alignment]]'' unlicensed continuation, by Creator/SimonFurman himself: The [[GreaterScopeVillain Liege Maximo]] finally [[BigBad takes center stage]] as the final threat that the Autobots and Decepticons had to face. One of the original Transformers created by Primus, the Liege Maximo coveted its divine power and wished to become [[AGodAmI a god equal to its creator]]. After creating the Decepticons, the Liege Maximo left Cybertron and formed the Cybertronian empire, who were responsible for wiping out countless species during their conquests. The worlds they conquered were added to the Hub, which would open a portal that would ascend the Liege Maximo to godhood while destroying the universe in the process. After being discovered by an Autobot scout ship, the Liege Maximo ordered its fleet to destroy the Autobots and Decepticons before they could intervene with its plans. It [[YourSoulIsMine harvested the sparks]] of its own followers to open the portal, and killed several more Transformers who stood in its way. [[LackOfEmpathy Utterly indifferent]] to lives that suffered at its hands, the Liege Maximo embraced its dark nature on its path to godhood.
* ''ComicBook/TheTransformers: Regeneration One'' ([[Creator/IDWPublishing IDW]], by Creator/SimonFurman):
** [[AxCrazy Megatron]] becomes [[TookALevelInJerkass far crueler and more sadistic]] than he was in the original Marvel series. After being reactivated by a group of humans investigating the crashed Ark, Megatron launched a campaign of slaughter in the hopes of luring Optimus Prime back to Earth. He used the Ark's systems to hack into military bases around the world, and [[NukeEm launched hundreds of nuclear missiles]] to turn the planet into a complete wasteland. Megatron then turned his former Decepticon soldiers into [[NightOfTheLivingMooks mindless zombies]] and ordered them to hunt down any [[KillAllHumans humans who were still alive]]. He kept Starscream [[AndIMustScream conscious of his situation]] as payback for his years of treachery, and kept Ratchet's disembodied head alive due to their PsychicLink. After waiting twenty-one years for the Autobots to arrive, Megatron captured Kup and infected with him a deadly disease to use him as bait. When Optimus arrived to put an end to his schemes, Megatron ordered the rest of the world's nuclear arsenal to be launched in an attempt to [[TakingYouWithMe kill everyone on the planet]], him and Prime included. [[DeathSeeker Wishing to go out in a blaze of glory]] and take everyone with him, Megatron became a vindictive sadist as a way to pass the time.
** [[GalacticConqueror Jhiaxus]] was a former senator on Cybertron who saw a [[VisionaryVillain grander destiny]] for his species than the one Primus laid out for them. Wishing to create a galaxy-spanning empire under his control, Jhiaxus stole the knowledge of how to create life from the Underbase and purged all records of himself from Cybertron. Over the millennia, Jhiaxus created the Hub Network, a series of interconnected planets built on a campaign of [[HostileTerraforming terraforming and genocide]]. When he arrived on Cybertron in the hopes of adding it back to his empire, he [[WouldBeRudeToSayGenocide sneered when Rodimus Prime suggested the beings he wiped out classified as life]]. This disregard for life was shown when his Primum Frugae slaughtered the Primordials on Cybertron for being "sub-evolved". He later revealed to Rodimus Prime his plans to reformat the Autobots into fitting his view of a "[[MasterRace master species]]" and execute the rest who were "[[FantasticRacism tainted]]" by outsider technology. Ultimately obsessed with instilling [[ControlFreak his own version of order]] across the galaxy, Jhiaxus showed a no remorse for countless worlds he stripped of life to build his empire.

[[AC:[[ComicBook/TransformersGenerationOne Dreamwave series]]]]
* [[TheAntichrist Megatronus Prime]], debuting here, is known as [[FallenAngel the Fallen]]. Created by Primus as one of the original Thirteen Primes, the Fallen became obsessed with the notions of [[OmnicidalManiac entropy and decay]], ultimately attempting to murder his creator after betraying him to [[PhysicalGod Unicron]]. Escaping the 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 "casualties in the wars of the Gods". Sharing his master's unquenchable thirst for destruction, [[TheDragon The Fallen]] is precisely the kind of servant that Unicron most needs.
* [[InsaneAdmiral General Robert Hallo]] was the head of military development for the United States Army. Obsessed with the idea of controlling the Transformers, Hallo had Adam Rook create a program that could remove the free will from Transformers, and hatched a plan to blow up the ''Ark II'' and gain a new robot army. After [[HeKnowsTooMuch killing a man who attempted to blow the whistle on the plan]], Hallo successfully destroyed the ''Ark II'', killing all the humans on board and sending the Autobots and captured Decepticons into the Arctic Ocean. However, Adam decided to keep the program for himself, and disappeared not long after. Years later, after discovering Rook has been using the program to build a criminal empire, Hallo convinced Spike Witwicky to revive Optimus Prime. However, when showed that he had free will and refused to follow Hallo's orders, he had Optimus, his Autobots and the Decepticons hit with an air strike, intending to kill them all. Unfortunately for Hallo, not only did they survive, an enraged group of Decepticons began rampaging through San Francisco. To be rid of the Transformers once and for all, Hallo ordered the city to be nuked, and when Spike burst in to stop him, Hallo holds him at gunpoint and [[ForcedToWatch forces him to watch]] as the city and Transformers are destroyed. When Spike accused him of only caring about power, [[CardCarryingVillain Hallo agreed with him]], saying power is the only thing keeping [[KnightTemplar Spike and his family safe]].
* The aforementioned Adam Rook is also known as Lazarus. After designing a program that would [[SlaveryIsASpecialKindOfEvil remove the free will from Transformers]], he decided to render the deaths of everyone aboard the ''Ark II'' meaningless by stealing the program and disappearing before Hallo had a chance to use it. Motivated by {{greed}}, Rook took the name Lazarus and built a criminal empire, using the program to [[ArmsDealer force Transformers to work for dictators and terrorists]], helping them stomp out their enemies without casualties on their side. He even forced good guys like Bumblebee, Ratchet and Ironhide to work for killers. Sometimes, he would take "customers" on tours of his base, and would make the Transformers kneel to him to show his power over them. After three years of running this successful criminal empire, Lazarus had a group of Transformers slaughter an oil refinery in the Arctic as a demonstration to potential buyers, and [[LackOfEmpathy casually began auctioning off all of them not long after]].

[[AC:[[Creator/IDWPublishing IDW continuity]]]]
* [[NotSoWellIntentionedExtremist Bludgeon]], debuting in ''[[ComicBook/TheTransformersMegaseries Stormbringer]]'', is the leader of a [[ApocalypseCult nihilistic cult]] and a former Decepticon war criminal. Trying to awaken Thunderwing, Bludgeon attempts to unleash him upon countless worlds to [[OmnicidalManiac erase them of life]]. Eventually falling in line with Shockwave, Bludgeon liberates Jhiaxus on his behest, butchering Wheelie and Garnak in the process, and aids Shockwave in his grand, universe-destroying plans. Returning later when confronted by the Dinobots, Bludgeon [[PlayingWithSyringes performs horrible experiments]] upon sparks and Transformers to twist and mold them into monsters, while attempting to awaken and control the monstrous Trypticon to go on a killing spree. Later switching allegiance to Unicron, Bludgeon happily intends to spread the destruction of the Chaos-Bringer across existence to consume all in their path. A psychotic nihilist with a fetish for destruction, Bludgeon ranks as among the worst of the Decepticons.
* [[HerosEvilPredecessor Nova Prime]], debuting in ''[[ComicBook/TheTransformersMegaseries Escalation]]'', is a self-concerned megalomaniac who ascends to Primehood following the abdication of the Thirteen Primes, "uniting" Cybertron and oppressing Cybertronians with "lesser" alt-modes under his banner. Plotting the conquest of the universe and the oppression of all other life forms, Nova had [[MadScientist Jhiaxus]] conduct twisted experiments on six "beast" Cybertronians, turning them into the horrifying Monstructor. Leaving Cybertron aboard the Ark-1, Nova deliberately ordered his crew to fly into a portal to the Dead Universe in order to satiate his own ego. From there, Nova plots to merge the Dead Universe with the "living" one, destroying all life in the process, allowing him to both return home at long last and [[AGodAmI ascend to godhood]]. Returning in ''ComicBook/DarkCybertron'', Nova kills the Autobot Hardhead by exposing him to the Dead Universe and intends to use Orion Pax, Rodimus and Cyclonus' sparks to power Kup's spacebridge, uncaring that this will kill them all.
* [[TheDreaded Overlord]] is without a doubt one of the vilest Decepticons to ever grace the organization's ranks. An easily bored {{sadist}} with a love for [[AxCrazy bloodshed]] and [[BloodKnight fighting]] known for tearing through battlefields with glee, Overlord developed a pathological fear of defeat and hatred of Megatron when the latter defeated him in combat, and dedicates his life to destroying Megatron for the insult. [[ComicBook/TheTransformersLastStandOfTheWreckers Taking over Garrus-9]] and turning it into a hellish [[POWCamp concentration camp]] after killing several of his own allies, Overlord tortures and butchers hundreds of Autobots in various creative ways, hoping to lure Megatron out with his sheer depravity only to order the 50 surviving Autobot prisoners executed when his plans for Megatron are foiled. Overlord later [[ComicBook/TheTransformersMoreThanMeetsTheEye horribly dismembers and kills the Autobot Rewind]], mocking his spouse with Rewind's final moments of agony, and endorses a war campaign that leads to widespread slaughter before ditching his allies. In his final appearance, Overlord teams up with [[MadScientist Tarantulas]], disguises himself as a human, and spreads warmongering ideology against his own species--trying to torture the human girl Verity to death during this venture as payback for thwarting him on Garrus-9--while planning to travel to countless alternate timelines and kill Megatron over and over before murdering Tarantulas when he tries to explain that Overlord's plans will shatter the timestream and lead to countless deaths.
* ''[[ComicBook/TheTransformersMoreThanMeetsTheEye More Than Meets the Eye]]'' (includes ''Lost Light''):
** [[MadDoctor Pharma]] was a former Autobot medic at a medical facility on the planet Delphi [[JumpingOffTheSlipperySlope whose evil began]] when he [[OrganTheft killed bots for their organs]] to bribe an elite Decepticon unit. To cover up his crimes, he has two other Decepticons unleash a plague on the facility to kill everyone. Pharma shoots a life-support when revealed, sending about 20 patients into near-death states, then tries to kill Ratchet twice before being thrown off the facility. When he finds Ratchet again, he separates Ratchet's head and spark from his body and starts torturing him. To prove he is a better medic, he has Ambulon, one of his co-workers from Delphi, [[HalfTheManHeUsedToBe sliced vertically in half]] with a {{chainsaw|Good}} and tells Ratchet to fix him, despite Ambulon already having died in agony.
** [[PsychoPsychologist Froid]] is a former rival and friend of Rung who aids in brainwashing dissidents of the corrupt Cybertronian Senate and makes a deal with [[SerialKiller Sunder]], offering to provide victims in return for Sunder aiding Froid in his research. Using Sunder to become wealthy and famous through the latter's ability to read memories, Froid secretly gives innocents for Sunder to kill. Froid boards the ''Lost Light'' to seek new victims for Sunder and tries to {{blackmail}} Rung--whose work he plagiarized--into giving Froid his patient files, releasing Sunder upon him as a distraction to escape when Rung refuses. Later, Froid [[TheCorrupter nudges the Autobot Getaway's darker impulses]] for his [[ForTheEvulz own perverse curiosity]], leading the latter to sacrifice some of his crew to Sunder.

''[[AC:[[VideoGame/TransformersDevastation Devastation]]]]''
* [[BigBad Megatron]] is the ruthless leader of the Decepticons, who waged war against the Autobots for millions of years, leading to his own homeworld Cybertron becoming uninhabitable. Constantly trying to [[TakeOverTheWorld take over Earth]], Megatron soon discovered the Autobot ship Proudstar, which was designed to cyberform uninhabited planets and started to [[HostileTerraforming cyberform New York City]]. Taking over that ship, Megatron creates a plan to use its Ferrotaxis supercomputer to speed up the process and cyberform the entire Earth, killing all organic life on it, which he [[FantasticRacism openly considers inferior]]. Repeatedly thwarting the Autobots' attempt at stopping the cyberformation process, including launching unstable core of the ship outside of New York, which could have caused an extinction-level explosion, Megatron shoots Ferrotaxis into space to keep the Autobots from getting it. When Optimus Prime managed to reach it, Megatron battles him, openly announcing his intention of creating the new Cybertron and [[GalacticConqueror retaking the galaxy in a bloody conquest]].

[[AC:''[[WesternAnimation/StarTrekTheAnimatedSeries Star Trek]] vs. [[WesternAnimation/TheTransformers Transformers]]'', by John Barber, Mike Johnson, et al.]]
* Megatron is once again portrayed as a power-mad tyrant. With the Autobots fleeing Earth with the breakout of WorldWarIII, Megatron and the Decepticons pursue them, resulting in a battle where both sides end up in stasis on a remote planet. Centuries later, a Federation mining team accidentally revives the Autobots and the Decepticons, resulting in the Decepticons attacking the Federation mining colony. Optimus Prime and the Enterprise crew team up and drive off the Decepticons, but Megatron meets and teams up with the Klingons. The Klingons and Decepticons renew their attack on the Federation mining colony, not caring how many Federation colonists die in these attacks. When Starscream flees to Kornos to conquer it, Megatron and the Decepticons pursue Starscream to Kornos. Megatron defeats Starscream and claims Kornos for himself so that he can [[SlaveryIsASpecialKindOfEvil enslave the Klingons]] and use their resources to launch a war of conquest against the Federation. [[ProudWarriorRaceGuy When the Klingons refuse to surrender]], Megatron orders his forces [[FinalSolution to annihilate all the Klingons]].

[[AC:''WesternAnimation/BeastWars'' (connected via BroadStrokes)]]
* [[BigBad Megatron]] is a 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, [[WeHaveReserves considers his own allies 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; unsuccessfully ordering Dinobot to kill Quickstrike, one of Megatron's relatively more loyal soldiers, after Quickstrike lost to Dinobot in a sort of re-entrance exam into the Predacons; 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 [[OmnicidalManiac 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.
* [[EvilGenius Tarantulas]] is a schemer and [[ChronicBackstabbingDisorder backstabber]] second-to-none. Planted as TheMole in Megatron's operation by the Predacon Secret Police, Tarantulas is a cackling MadScientist, who enjoys performing gruesome experiments on his victims, and eating anything or anyone he catches in his giant webs, organic or 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. Tarantulas later 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. He tries to destroy the Ark, which would [[TimeCrash create a time paradox]] and lead to the extinction of the Transformers as a species. Ultimately betraying both sides, Tarantulas is revealed to be descended from neither Autobot nor Decepticon, and he attempts to use alien technology to [[OmnicidalManiac wipe out all factions]], swearing that when he's done with his own species, he will return and commit genocide against the aliens themselves. Void of loyalty or conscience, Tarantulas makes even his own nominal allies uneasy, a fact that he is downright proud of.

!![[Film/TransformersFilmSeries "Bayformers"]]

[[AC:[[Film/{{Transformers}} 2007 film]]]]
* [[VideoGame/TransformersTheGameConsole Console video game]]: [[BigBad Megatron]] is the leader of the [[Characters/TransformersFilmSeriesDecepticons Decepticons]], who waged war on his home planet Cybertron, resulting in it dying and all surviving Cybertronians being forced to flee from it. In search of the Allspark, Megatron came to Earth and got frozen in the Arctic. In the Decepticon campaign, Megatron, immediately after getting freed, orders his Decepticons to hunt down and kill all the Autobots. After they killed all of the Autobots aside from Optimus Prime, Megatron started to destroy a city, simply as a way to lure Optimus Prime out. Succeeding at that, Megatron managed to [[HeroKiller kill Optimus Prime]] and get his hands on the Allspark, invading the Earth and [[KillAllHumans exterminating humanity]], before proclaiming that he is finished with Earth.
* [[VideoGame/TransformersTheGameDS DS video game]]: [[BigBad Megatron]] lacks his film counterpart's nobler traits and [[AdaptationalVillainy replaces it with raw brutality]]. Having plunged Cybertron into civil war after [[{{Patricide}} killing his own father]], Megatron tore out Bumblebee's vocal processor when he launched the Allspark into space. He followed the Allspark to Earth, but wound up frozen in the Arctic Circle. After being thawed out by his followers, Megatron's murderous rage was only tempered when they planned to blow up Hoover Dam and drown thousands of people. In ''Autobots'', Megatron used the Allspark to terrorize the city of Tranquility and mortally wounded Create-A-Bot while trying to kill his own brother, Optimus Prime. In ''Decepticons'', he tracked down and murdered Jazz after he foiled his plot to destroy Hoover Dam. After terrorizing Tranquility, Megatron killed Optimus and hunted down his traitorous lieutenant Starscream. Create-A-Con was gravely wounded after helping him defeat Starscream, and Megatron [[UngratefulBastard chose to kill him rather than waste resources trying to repair him]]. Megatron showed no remorse for the Decepticons who gave their lives for him and [[TheSocialDarwinist believed that the weak were only meant to serve the strong]].

''[[AC:[[Film/TransformersRevengeOfTheFallen Revenge of the Fallen]]]]''
* The Fallen, also known as [[SatanicArchetype Megatronus Prime]], is this film's BigBad and the film universe's first Decepticon. Originally one of the 7 members of the Dynasty of Primes, The Fallen betrayed his brothers and attempted to use the Star Harvester on Earth's Sun regardless of the Dynasty's code against taking life, solely because of his FantasticRacism towards primitive humankind. Eons after his defeat, The Fallen corrupts Megatron, creates the Decepticons, and orders him to find the All Spark, [[GreaterScopeVillain making him responsible]] for the events of the first film. After he lures Optimus Prime to his death using Sam as bait, The Fallen sank an aircraft carrier, attacked several human cities, and slaughtered a sizable military force while acquiring the Matrix of Leadership to activate the Star Harvester again, fully intending to [[OmnicidalManiac wipe out the human race]].
* [[Creator/IDWPublishing IDW comic]]: [[BigBad The Fallen]] himself is portrayed as even worse than his film counterpart. Once a member of the Thirteen Primes, The Fallen came to believe [[AGodAmI he was destined to become the most powerful of his brothers]] by re-powering the Allspark, then using it to make himself all-powerful. Using the Star Harvester, The Fallen drains the energy from a sun, uncaring that it leads to an entire planet dying, and blames it on one of his own servants when confronted about it. After attempting to use the Star Harvester once more, The Fallen comes to the realization that he no longer needs his Prime "brothers" or the Allspark, prompting instead to travel the universe searching for sentient life, then [[OmnicidalManiac slaughtering countless worlds of their sentient species]], [[TheCollector absorbing the knowledge, weapons, and strategies]] of the billions he slays as he goes along. After butchering his Prime brothers, The Fallen attempts to use the Star Harvester to [[EarthShatteringKaboom wipe out the entire Earth]], [[{{Sadist}} taking extra time to crush humans underfoot while laughing]]. Though [[SealedEvilInACan sealed away for thousands of years]], The Fallen continues his wicked ways, as he [[TheManBehindTheMan reaches out]] and [[TheCorrupter corrupts]] the noble Megatron into waging a war against Optimus Prime and the Autobots, leading to countless deaths and the destruction of Cybertron itself. The Fallen hopes to return to Earth and use the Star Harvester to destroy it for good this time, solely as a final act of spite toward his brothers.
* [[UsefulNotes/PlayStation3 PS3]][=/=][[UsefulNotes/Xbox360 360]][=/=]PC video game:
** [[SatanicArchetype The Fallen]] is [[GreaterScopeVillain the original Decepticon]] and one of the 13 original Primes, who betrayed his "brothers" by slaughtering them for refusing to use their Star Harvester to harvest the Earth's sun for Energon, because they didn't want to doom the life on the planet. Ordering the Decepticons to wreak havoc and kill humans and Autobots, The Fallen has them revive Megatron. In the Decepticon campaign, The Fallen uses Megatron to find the Star Harvester, promising to make him a Prime, intending to betray him [[YouHaveOutlivedYourUsefulness as soon as he succeeds]]. When Megatron confronted him about a lie, The Fallen immediately tries to kill him, using countless Decepticons as CannonFodder, while intending to not only destroy all life on Earth, but [[OmnicidalManiac harvest countless stars and worlds across the galaxy]].
** [[TheStarscream Starscream]] is the treacherous [[TheDragon right hand]] of Megatron, who immediately took over as the leader of the Decepticon forces after Megatron died. Coordinating and organizing the Decepticon attacks on cities and military bases, Starscream encourages Decepticons to kill more innocent humans along the way. As his troops succeed to kill some Autobots, Starscream kidnaps and extract information about Mikaela Banes, Sam Witwicky's girlfriend, from a group of innocent people, killing them in process, and planning to kill Sam and Mikaela as well, Starscream has his troops search for them. Later on, assisting The Fallen in his attempts at harvesting Earth's sun, thus destroying all life on the planet, Starscream destroys a large museum full of people, trying to catch Sam and the ancient Seeker Jetfire.
* [[UsefulNotes/PlayStation2 PS2]][=/=][[UsefulNotes/{{Wii}} Wii]] video game: Megatron is the former leader of the Decepticons, who lost his position after dying at Optimus Prime's hands. After he got revived by the Fallen, Megatron was angry at the fact that The Fallen took away his leadership over the Decepticons. Barely tolerating his "new master", Megatron orders his Construction Devastator to spread chaos and destruction all over Chinese city of Shanghai, destroying large parts of the city, simply so he can get the piece of the Allspark. Destroying human military bases, Megatron assists The Fallen in his attempts at [[OmnicidalManiac destroying all life on Earth]] simply so he can have a victory over the Autobots.

''[[AC:[[Film/TransformersDarkOfTheMoon Dark of the Moon]]]]''
* [[Creator/IDWPublishing IDW comic]]:
** [[AdaptationalVillainy Unlike in the film]], [[PsychoForHire Shockwave]]--also in the ''Foundation'' and ''Rising Storm'' prequel comics--is portrayed as a brutal and remorseless Decepticon assassin. Initially a follower of Sentinel Prime, Shockwave expressed disgruntlement with an age of peace and freedom and, as part of Megatron's Defense Force, eagerly massacred dissenting Cybertronians. After joining the Decepticons, Shockwave earned a reputation as [[TheDreaded Megatron's most lethal subordinate]], openly admitting to [[LovesTheSoundOfScreaming enjoying the sounds of Autobots dying]]. Left in command of the Decepticons on Cybertron whilst Starscream searched for the Allspark, Shockwave waged a brutal campaign against the remaining Autobots, killing, amongst others, the Autobot Chromia. On Earth, Shockwave murders the Autobots Longarm and Salvage, as well as the entire crew of an oil processing plant, without provocation. Enslaving the drone who would later become "Brains" to build a "cage" for his Driller, Shockwave openly plans to terminate him [[YouHaveOutlivedYourUsefulness when he is no longer useful]]. When Brains escapes, Shockwave tracks down Starscream's Decepticon splinter group, casually killing Deadlift simply for [[DisproportionateRetribution being in his way]], and conscripts them into tracking Brains down. Shockwave then goes on a killing spree in the NEST base in Diego Garcia, killing all the personnel, human and Autobot alike, including traumatized Autobot refugees. [[LackOfEmpathy Devoid of empathy]], Shockwave mocks Elita-One's death at his hand to Prime's face and, later, sadistically taunts Prime about the Autobots that Shockwave killed during their encounter in Chernobyl. Even the death of the Driller, his [[UndyingLoyalty loyal]] pet, fails to rouse any emotion from Shockwave, who treats its death as an inconvenience. A merciless sadist who revels in killing, Shockwave terrifies Autobot and Decepticon alike.
** Dylan Gould, [[AdaptationalVillainy unlike in the film]], is portrayed as a sadistic psychopath with delusions of grandeur. Having willingly allied with Decepticons years back, Gould covers up the Decepticons' plans and presence from the public eye, having anyone who attempts to learn the truth murdered by his personal Decepticon attack dog, [[FeatheredFiend Laserbeak]]. Once the Decepticons reveal themselves and attack the Earth, Gould uses Sam Witwicky to spy on the Autobots under threat of slaughtering his girlfriend, Carly, and giddily gives the order for the Autobots to be shot down while they are attempting to leave the Earth. Masterminding the invasion of Chicago, Gould has the Decepticons kill countless people and destroy much of the city while turning it into a fortress. Gould ultimately plans to assist the Decepticons in transporting as much of humanity to Cybertron as possible, then use them as slaves to rebuild Cybertron while Gould [[AGodAmI lords over them as their master]]. Even when the Autobots and humans begin defeating the Decepticons, Gould still activates the portal to bring Cybertron to Earth, completely eliminating any possible claims he had to not being fully complicit in the Decepticons' actions. [[FauxAffablyEvil Always wearing a smile and having a witty quip on hand]] to cover up his [[ItsAllAboutMe raving egomania]], Gould truly [[HumansAreTheRealMonsters represents the very worst humans have to offer]].
* Creator/PeterDavid's {{novelization}}: Sentinel Prime [[AdaptationalVillainy loses all of his film counterpart's redeeming features]], turning the somewhat-sympathetic WellIntentionedExtremist into a psychopathic KnightTemplar. Having made a deal with Megatron eons ago to [[FaceHeelTurn betray his allies the Autobots]], Sentinel fulfills this deal in the present after pretending to assist the Autobots, showing his true colors by ruthlessly executing three of his "brothers." Sentinel steals the Pillars from the military group NEST by threatening its director, Charlotte Mearing, stating that if she doesn't give him the Pillars, he will force her to watch as he slaughters every man, woman, and child he can until she does. Lying to humanity to get them to force the Autobots to leave Earth in exchange for Sentinel's offer of peace, Sentinel [[ILied goes back on his word]], orchestrating a full-scale invasion of Earth by the Decepticons and personally overseeing the blood-soaked conflict in Chicago. Sentinel ultimately plans to transport as many humans to Cybertron as possible, then torture and abuse them into reconstructing Cybertron, leaving [[KillAllHumans the rest of humankind]] to be destroyed alongside the Earth by Cybertron's gravitational field. In the end, Sentinel treats the deaths of Autobot and Decepticon alike with cold satisfaction, proclaiming that [[AGodAmI he will be the only god left on Cybertron]] when the dust settles, proving once and for all that, despite his claims of wanting the best for his people, Sentinel truly [[ItsAllAboutMe only cares for himself and his supposed claim to godhood]].

''[[AC:[[Film/TransformersAgeOfExtinction Age of Extinction]]]]'' [[note]]See [[Franchise/TransformersAlignedUniverse Aligned Universe]] for ''[[VideoGame/TransformersRiseOfTheDarkSpark Rise of the Dark Spark]]''[[/note]]
* [[StrawHypocrite 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. Attinger entered a deal between himself, [[BountyHunter 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. [[NotSoWellIntentionedExtremist Despite his rhetoric]], Attinger's actions and the consequences of said actions--having Cade Yeager's daughter Tessa threatened and causing possibly millions of human deaths through the Seed—-prove him to be driven only by his {{greed}} and [[FantasticRacism hatred of Transformers]].

!![[Franchise/TransformersAlignedUniverse Aligned Universe]]

[[AC:[[VideoGame/{{Transformers}} Video Games]]]]
* ''[[VideoGame/TransformersWarForCybertron War for Cybertron]]'' & ''[[VideoGame/TransformersFallOfCybertron Fall of Cybertron]]'': [[BigBad Megatron]], leader of the Decepticons, is the instigator of the first game's titular war. A merciless tyrant, Megatron is bent on the conquest of Cybertron and the destruction of the Autobots, with the resulting war ravaging Cybertron and devastating its population. After taking control of the powerful [[TheCorruption Dark Energon]], Megatron infects Cybertron's core with the substance, further damaging the planet and bringing it under his control. When this corruption is cleared away, the core is forced to shut down, leaving Cybertron on the brink of death. As the Autobots try to leave the dying world, Megatron has their ships shot down, endangering the future of his own species to satisfy his hatred for the Autobots, before sending the monstrous [[HumongousMecha Trypticon]] after them. In ''[[VideoGame/TransformersRiseOfTheDarkSpark Rise of the Dark Spark]]'', Megatron acquires the Dark Spark and uses it to resurrect dead Autobots as mindless drones who will fight on his side. When offered a truce by Optimus Prime in ''Fall of Cybertron'', Megatron refuses, [[NeverMyFault blaming Optimus]] for Cybertron's decline, declaring [[ItsAllAboutMe himself the planet's future]], and trying to destroy the Autobots' last hope of leaving Cybertron alive. After discovering the damaged Trypticon, Megatron, [[BadBoss not caring if Trypticon is still conscious or not]], has him forcibly converted into a warship for his own use. As the Autobots flee Cybertron, Megatron stages one last assault on the Ark, doing his best to kill Optimus Prime and doom the Autobots. Ruthless and [[BloodKnight bloodthirsty]] beyond measure, [[TheUnfettered Megatron]] is willing to doom his own homeworld and his entire species to satisfy his lust for power and hatred for his enemies.
* ''[[VideoGame/TransformersFallOfCybertron Fall of Cybertron]]'' & ''[[VideoGame/TransformersRiseOfTheDarkSpark Rise of the Dark Spark]]'': [[EvilGenius Shockwave]] is one of the highest ranking Decepticons in [[BigBad Megatron]]'s army, who is [[MadScientist responsible for many of their inventions]]. After Megatron sent him to track down the ancient artifact called the Dark Spark, Shockwave managed to enslave Insecticons to his will and captured Cliffjumper, planning to experiment on him later. Succeeding in getting the Dark Spark, Shockwave helped Megatron use it to revive the dead Autobots, while planning to capture and experiment on many more Autobots. After that, Shockwave captured and experimented on countless Autobots and Insecticons, dissecting them in his labs. Forcing his Decepticon underlings to work with the Insecticons, despite the wild nature of the beasts, Shockwave didn't care that this led to them slaughtering each other. Getting his hands on Grimlock and his Lightning Strike team, Shockwave performed numerous especially brutal experiments on them, hoping to wipe their mind and rebuild them as his own foot soldiers. After Grimlock freed himself, Shockwave [[BadBoss sent hundreds of his own underlings and Insecticons to get slaughtered]], simply as a way to test Grimlock's abilities.
* ''[[VideoGame/TransformersRiseOfTheDarkSpark Rise of the Dark Spark]]'': [[Film/TransformersAgeOfExtinction Lockdown]] is a BountyHunter searching for the titular Dark Spark. After discovering that it has landed on Earth, he and his army of mercenaries attack a city in their quest to find it, and also torture Drift and nearly kill him and Bumblebee after they interfere. Once he acquires the Spark, Lockdown and his army later attack a second city so he will [[TimeTravelForFunAndProfit gain access to a time bridge]] hidden underground. As he prepares to activate the bridge, he gloats to Optimus Prime about how he plans on using the bridge to bring the Decepticons down to Earth, which would reignite another Cybertronian civil war that would result in the Earth being destroyed. [[PsychoForHire Relishing in his profession]], Lockdown nearly started another galactic war that would've killed millions of humans and Cybertronians alike, [[WarForFunAndProfit all so he could satisfy his greed]].

''[[AC:[[WesternAnimation/TransformersPrime Prime]]]]''
* [[Characters/TransformersPrimeUnicronAndTheTerrorcons Unicron]] is an [[AbusivePrecursors ancient entity]] that shared an existence with Primus before both developed their own viewpoints and feelings towards the universe, Unicron choosing to see all life as pointless and beneath himself. Unicron [[OmnicidalManiac waged a path of destruction across the universe]], destroying countless worlds before being plunged into a deep slumber from which the Earth formed around him and gave life to humanity. Upon being awoken by Megatron's efforts, Unicron immediately [[UngratefulBastard denounces the loyal Megatron as worthless to him]], and reveals his plans to destroy the entire Earth and personally enjoy the annihilation of humankind. Although Unicron was beaten, his essence attached to Megatron, and soon takes control of Megatron's corpse—-in the process [[BarredFromTheAfterlife barring the Decepticon from the afterlife]] and keeping him as a toy to be tortured—-after which Unicron plans to destroy Cybertron as a final spite against his former brother Primus.
* Colonel Leland "[[RightWingMilitiaFanatic Silas]]" Bishop is leader of MECH, a terrorist group researching Cybertronian technology. His crimes include capturing Breakdown, torturing him, trying to have him vivisected, and removing one of his eyes; and allying MECH with Airachnid to get his hands on another Cybertronian, 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. 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, taking the name CYLAS--[[FunWithAcronyms "CYbernetic Lifeform Augmented by Symbiosis"]]--[[TranshumanTreachery betrays the human race to Megatron]]. Seeing himself as [[AGodAmI a superior being]], he razes a military base just to get Megatron's attention, then attempts to blow up everybody inside Raf's house.
* The aforementioned [[ArachnidAppearanceAndAttire Airachnid]] is a self-styled "ex-Decepticon" who spent her time in the Great War capturing, torturing, and slowly killing any Autobots she could find [[ForTheEvulz for fun]]. 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: [[EgomaniacHunter hunting endangered and soon-to-be extinct species]]—or species [[OmnicidalManiac she will make extinct]]--for sport and collecting grisly "trophies" of her kills. Should she find an attractive species that isn't endangered, she'll ensure that they are by the time she's done, deciding to make humans her new toys, starting with the teenage Jack Darby. Forced back into serving Megatron, Airachnid barely hides her dissatisfaction, [[TheStarscream trying to usurp control from Megatron at times]]. She finally breaks free when she finds an Insecticon hive, murders fellow Decepticon Breakdown along the way, and plans to use her new servants to destroy Megatron. Sadistic, merciless and terrifying while enjoying her atrocities, Airachnid is one of the worst to wear the Decepticon logo.
* ''Beast Hunters'' comic: [[TheSocialDarwinist Airwave]], from the first two issues, is an Autobot, who after the Great Civil War [[FaceHeelTurn abandoned the Autobots' ideals]] in favor of an "everyone out for himself" philosophy, due to believing that Optimus Prime and the others left them to die on Cybertron. Forming one of the Autobots cities underground, called Lost Spark, Airwave found an easy way to get Energon for himself by secretly killing his own followers and then draining their bodies of Energon in the morgue. Thus killing several dozen of his own people and closest friends, Airwave planned to feast on all inhabitants on the Lost Spark, until he was discovered by Sludge and Snarl, after which he shot Firestar in the back and framed them for it, leading to his followers attacking them. Trying to kill Sludge and Snarl, Airwave didn't care when he killed dozens of his own people in the crossfire.

''[[AC:[[WesternAnimation/TransformersRobotsInDisguise Robots in Disguise]]]]''
* [[GreaterScopeVillain Megatronus]], once a member of the Thirteen Primes, was locked away for betraying his comrades and murdering Solus Prime. [[LeakingCanOfEvil Still having influence outside of his prison]], Megatronus causes the Decepticon prison transport ship, ''The Alchemor'', to crash on Earth, unleashing dozens of Decepticons on the planet. Contacting [[BigBad Steeljaw]], Megatronus manipulates him into releasing him from his prison, and uses his psychic powers to force one of Steeljaw's soldiers to begin amputating his own arm to convince Steeljaw to work faster. When unleashed from his prison, Megatronus betrays Steeljaw, tries to murder both him and the Autobots attempting to thwart him, and reveals he plans to use the power of Unicron and the Allspark to [[OmnicidalManiac destroy both Earth and Cybertron in one fell swoop]] as revenge for his imprisonment. [[FaceHeelTurn Perhaps once a good person]], Megatronus shed any heroic traits and replaced them with pure sociopathy and blind hatred.

!!Other Continuities (by release date)

[[AC:''[[Anime/TransformersRobotsInDisguise Robots in Disguise]]'' (dub only)]]
* [[EvilOverlord Megatron]] is the [[BigBad leader of the Predacons]], who arrived on Earth in search of the Autobot Weapon Fortress Maximus under the pretext of raiding Earth for its energy. Upon arrival, he kidnaps Doctor Kenneth Onishi and probes his mind to find the location of Fortress Maximus. After receiving knowledge of the Autobot Protoforms, Megatron corrupts their sparks in order to create his Decepticons. Although initially AFatherToHisMen to his minions if they prove themselves worthy of respect, he [[BadBoss discards these qualities]] upon his rebirth as the Decepticon [[VileVillainSaccharineShow Galvatron]]--absorbing the energies of the Predacon Brothers against their will to power his new body immediately upon his transformation, and later reducing Scourge and the Decepticons to mindless drones for plotting to overthrow him with the use of Fortress Maximus. Galvatron's worst actions, however, came during the finale when, after surviving a battle with Fortress Maximus, he transforms into bat form and drains Fortress Maximus's energy to power himself. He then unleashes his bat swarm to brainwash human children with the goal of enslaving them and repeating the process from planet to planet until he has conquered the universe, [[WouldHurtAChild threatening to harm the children]] if Omega Supreme or the Autobots intervene. When the Autobots flee into the Space Bridge, Galvatron sends the Decepticons to pursue with the intention of destroying both groups by collapsing the Space Bridge, not caring if any Predacon gets caught in the collapse, [[ItsAllAboutMe all so he could have the entire planet to himself]].

''[[AC:Anime/UnicronTrilogy]]''
* [[GreaterScopeVillain Unicron]] is a powerful and ancient Transformer who feeds upon [[PlanetEater worlds]] and the [[EmotionEater negative emotions]] of others. Disguising himself as one of Cybertron's moons, Unicron created the Mini-Cons to escalate the war between the Autobots and the Decepticons. Hoping to consume both sides once he regained enough power from their conflict, Unicron's plans were foiled when the Mini-Cons gained free will and abandoned Cybertron. Once fully awakened, Unicron attacked Cybertron, killed Starscream, and briefly stripped the Mini-Cons of their free will. After being defeated, Unicron returned by devouring the home world of Alpha Q and all of its inhabitants. When Megatron revived him, in hopes of turning him into a weapon, [[EvilIsNotAToy Unicron possessed Megatron]] and went off to [[OmnicidalManiac destroy several planets]] that Alpha Q had managed to restore.
* The aforementioned [[BigBad Megatron]], later known as Galvatron, is the brutal commander of the Decepticons. Desiring to destroy the Autobots and conquer the universe, Megatron enslaves Mini-Cons, tries to kill the Autobots' human allies, and tries to destroy Earth with the Hydra Cannon. Upon his resurrection, Megatron leads his forces in destructive raids for Energon. Megatron plans to use the element to revive Unicron and use him as a weapon. Megatron uses Unicron's power to [[BadBoss subvert the wills of his followers]], notably enslaving Scorponok and Starscream. Developing [[AGodAmI a god complex]], Megatron seeks to use the Cyber Planet Keys to accelerate the Unicron Singularity's expansion to [[OmnicidalManiac end reality]] and reconstruct it [[InTheirOwnImage in his own image]].

[[AC:''Transformers[=/=]Franchise/GIJoe'', by John Ney Rieber]]
* [[BigBad Cobra Commander]] continues to prove himself capable of being an irredeemable psychopath when it comes to adaptations of his [[WesternAnimation/GIJoeARealAmericanHero original iteration]]. With Cobra serving as [[ANaziByAnyOtherName a stand-in for the Nazi Party]], Commander runs his empire with the same cruel egomania that the Nazis were known for. After discovering the Decepticons hidden in an ancient monastery whose inhabitants he has just had slaughtered, Commander forcefully takes control of the Decepticons and forces them to lay waste to numerous countries across Europe, including Berlin and Rome. Any survivors of these massacres, including the children, are forced into slave camps, and, later, used as {{human shield}}s against the Commander's enemies. After forcing a Decepticon to exhaust all his energy in wantonly laying waste to enemies and allies alike, the Commander reveals his plan to use the Decepticons to institute a new world order under his rule where only the strong will survive and serve under his thumb. Cobra Commander is a megalomaniac whose status as a stand-in for [[UsefulNotes/AdolfHitler the Nazi leadership]] makes him one of the most realistic, and wicked, baddies throughout the ''G.I. Joe'' franchise.

''[[AC:[[WesternAnimation/TransformersAnimated Animated]]]]''
* [[TheChessmaster Megatron]] is the cruel, ruthless [[BigBad leader of the Decepticons]] and the Autobots' worst enemy. A megalomaniac who overthrew the generally peaceful leader of the Decepticons to make them his own, Megatron spurred them into all-out war against the Autobots, leading to heavy casualties on both sides. Megatron utilized chemical weapons that wiped out entire battlefields--even his own men--and air bombings on civilians during the Great War. After resurrecting himself on Earth, having caused much destruction to regain his body, Megatron makes several attempts to invade Cybertron, culminating in him ordering Decepticon attacks on several Autobot bases throughout the cosmos while he personally invades Cybertron and destroys its Autobot leaders, planning to test his new Omega Supreme clones by first annihilating Detroit.
* [[PsychoForHire Lockdown]] is a ruthless and sadistic BountyHunter whose only loyalty is to himself. Unaligned with Autobots or Decepticons, Lockdown is indiscriminate in his prey, taking commissions from whomever is willing to pay him. To make himself more powerful, Lockdown steals upgrades from his targets, torturing them by cutting the weapons from his victims' bodies. [[LackOfEmpathy Devoid of empathy]], Lockdown sees his victims as little more than trophies, taunting them if he chances to encounter them again. [[APupilOfMineUntilHeTurnedToEvil Having once been a student of the Autobot Yoketron]], Lockdown murdered his former master in order to steal the protoforms under Yoketron's protection and sell them for his own profit. Merciless and consumed by {{greed}}, Lockdown is a sociopath who frightens and disgusts Autobots and Decepticons alike.
* [[MadScientist Meltdown]], originally Prometheus Black, is a human scientist who ended up 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--one of them his own lawyer--into [[TransformationHorror gruesome hybrids combined with animal parts]], he also decides to kidnap Sumdac's innocent [[WouldHurtAChild 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, [[UngratefulBastard 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. 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.

''[[AC:[[ComicBook/TransformersShatteredGlass Shattered Glass]]]]''
* [[AxCrazy Ultra Magnus]] was locked up in his universe for trying to usurp Optimus Prime, getting his face ripped off in the process. He and several others travel to earth, where he assimilates numerous Autobots into the Junkion hordes, resulting in them 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 [[OmnicidalManiac cause the death of the entire universe]]. Even the normal Decepticons turned against him, as they wanted to be the conquerors, and [[EvenEvilHasStandards were appalled]] when they realized the extent of the damage.
* "[[http://web.archive.org/web/20180219004136/http:/www.transformersclub.com/prose/coalescence.pdf Coalescence]]": [[MultiversalConqueror The Fallen]] escapes from his defeat in an undefined universe and retreats into the ''Shattered Glass'' universe. There, he discovers the nature of negative-polarity universes, and plots to conquer them all. [[ManipulativeBastard Deceiving the Underbase staff into serving him]], The Fallen has them build a portal to the multiverse that requires "components" to work, said "components" being [[PoweredByAForsakenChild organic brains in cybernetic bodies]], while also forcing his zealously loyal follower Sunstorm to use his fire powers to thaw him out from the ice that freezes him, [[BadBoss apathetic to the fact that using too much power will kill Sunstorm]]. Under The Fallen's servitude, agents of the Underbase deceive organic aliens of all kinds into becoming "components" under false promises, and then use them as [[LivingBattery batteries]], painfully electrocuting them in the process. When Cyclonus, Darkwing and Crasher arrive to find and save their human friends, The Fallen attempts to kill them, [[PragmaticVillainy sparing them only because Crasher's unique brain allows her to be used as a "component"]]. Once the multiversal portal was ready, The Fallen sends his servants to inspect the universes it leads to, and if they're not negative-polarity universes, he demands the portal be shut down until the next trial, [[LackOfEmpathy permanently trapping his servants on the other side]] and [[LackOfEmpathy showing no concern for their lives even if they're killed]]. Even in the MirrorUniverse, The Fallen proves that he will remain an irredeemable monster whenever he manifests himself in the multiverse, [[EvenEvilHasStandards appalling even his own troops]].

[[AC:''WebAnimation/TransformersPrimeWarsTrilogy'']]
* [[TheJuggernaut Overlord]] is a powerful Decepticon warrior who's been holding a grudge against Megatron after he became the only Transformer to beat him in battle. When [[BigBad Megatronus Prime]] offered him a chance to gain his revenge, Overlord happily assisted him in his plan to [[YourSoulIsMine harvest the sparks]] of all Cybertronians. Overlord murdered the Mistress of Flame in his quest to find Megatron and forced Hot Rod to become the new host of the [[ArtifactOfDoom Matrix of Chaos]]. Overlord and Rodimus Cron violently interrogated any Cybertronian for Megatron's whereabouts. He [[ForcedToWatch forced Menasor to watch]] as Rodimus shot off Devastator's limbs and snapped his neck once he got the info he needed. Once he found Megatron, Overlord promised he would make him suffer by making his death as slow as possible. Willing to help commit genocide to settle old scores, Overlord is a petty sadist who can't stand the shame of defeat.
* [[PhysicalGod Unicron]] was once a powerful [[PlanetEater planet-eating]] Transformer who was destroyed by the Thirteen Primes after he attempted to devour Cybertron. Reduced to a disembodied head in space, his consciousness was contained within the Matrix of Chaos. When Megatronus planned to harvest the sparks of every Cybertronian, Overlord chose Hot Rod to become the host for Unicron's power. Now going by Rodimus Cron, Unicron assisted Overlord in torturing other Cybertronians and executed Devastator and Sludge in cold blood. After killing Victorion by [[OffWithHisHead ripping off her head]], Unicron taunted Windblade by claiming that the Hot Rod she knew was dead. Once he learned Megatronus had the Matrix of Leadership, Unicron [[DemonicPossession took full control over Hot Rod]] and [[TheStarscream planned to destroy the last of the Primes]]. When Optimal Optimus removed the Matrix of Chaos from Hot Rod's body, Unicron attempted to possess Megatron and force him to kill his allies. A god only wanting to be feared, Unicron sought only to destroy the legacy of his rival Primus.

[[AC:''[[WesternAnimation/TransformersCyberverse Cyberverse]]'']]
* [[TheStarscream Starscream]] is the former second-in-command of the Decepticons willing to do anything for power and revenge. Abandoned by Megatron for his treasonous behavior, Starscream manipulates his loyal Seekers to help him steal the [=AllSpark=] and Vector Sigma so he can become [[AGodAmI a living god]] and kill all Cybertronians for his insane utopian vision, starting with his loyalists first. When defeated by Optimus Prime and imprisoned on the Ark, Starscream tampers with Wheeljack's [=AllSpark=] emitters to launch a HatePlague upon the Autobots in the hopes that they would kill each other. His most heinous crime is when he encounters [[MultiversalConqueror the Quintessons]] and gladly sells out his planet and race to save his own spark. Rebuilt as a Quintesson Judge, Starscream uses his newfound authority to declare all Cybertronians guilty of crimes against him and takes delight in massacring civilians with the enslaved War Titan Croaton as he prepares to destroy the entire universe in his final act of revenge. An OmnicidalManiac who holds no loyalty to anyone but himself, Starscream is a threat so destructive that the Autobots and Decepticons are willing to put aside their differences to save their universe.
* [[EvilDoppelganger Megatron X]], aka the Other One, is a Megatron from an alternate universe where he took the fateful decision of murdering his former friend Optimus Prime and claiming his Matrix of Leadership early in the war. With Prime gone, Megatron X proceeded to kill all the Autobots and use the [=AllSpark=] to create his mindless army of "[[MechaMooks Perfect Decepticons]]". After gaining his perfect army, Megatron X [[YouHaveOutlivedYourUsefulness exterminated his "unneeded" Decepticons]] and [[BadBoss tormented the survivors Astrotrain and the Insecticons]] so much that they would rather flee to other universes than live under his rule. When the multiverse-hopping Megatron steals his Matrix to stop the Quintesson invasion in present-day, Megatron X pursues his doppelgänger with extreme prejudice, eventually catching up to him in the main universe. He kills Megatron with ease, [[PretenderDiss calling him unworthy and a failure to his name]], and relishes to repeat his genocide of Autobots and Decepticons all over again in this universe. Feared and hated by everyone, Megatron X is what Megatron would have been without honor or respect for Optimus Prime.

''[[AC:Film/{{Bumblebee}}]]''
* [[BigBadDuumvirate Shatter and Dropkick]] are a pair of Decepticons out to hunt down and kill Optimus Prime. [[EstablishingCharacterMoment Introduced]] torturing and murdering the Autobot Cliffjumper, the two arrive on earth where Dropkick kills a human simply [[ForTheEvulz for fun]]. Directed to the human authorities, the two claim to be peacekeepers hunting down a criminal to give them access to humanity's satellites. After capturing and torturing Bumblebee, the two murder a doctor who was helping them, revealing their intent to bring their forces down on Earth and [[KillAllHumans kill every human being]], not stopping until the planet is a cinder. A vicious pair of BrainsAndBrawn, Shatter and Dropick embody the worst of the Decepticons.

* [[AxCrazy Overlord]], debuting as the BigBad in ''[[ComicBook/TheTransformersLastStandOfTheWreckers Last Stand of the Wreckers]]'', is without a doubt the most depraved Decepticon to ever grace Megatron's ranks. Though [[SuperSoldier always a terrifying force of savagery]], [[TheDreaded known and feared by friend and foe alike due to his psychotic brutality on the battlefield]] where he [[BloodKnight regularly slaughters dozens of enemies with his bare hands]], Overlord's truly wicked nature comes out in full when he is sent to Garrus-9 to oversee the rescue of Decepticon prisoners. Deciding instead to [[TheCaligula take over the entire planet]], Overlord executes the current Decepticon general, alongside any of his supporters, before turning the planet into a hellish [[POWCamp concentration camp]] occupied by hundreds of Autobot prisoners. Overlord [[{{Sadist}} takes sick pleasure]] in the various atrocities he perpetrates against his defenseless prisoners, from dismemberment, to public executions, to "releasing" them, then chasing them across the planet in "hunts", all of which he subjects his own troops to should they annoy him. Having a pathological fear of defeat, Overlord's entire motive stems from [[EvilIsPetty always losing to Megatron in sparring matches]], and to ensure he can't "lose" to the Wreckers when they come to rescue his prisoners, Overlord has all 50 of the surviving prisoners executed. Returning later in the ''[[ComicBook/TheTransformersMoreThanMeetsTheEye More Than Meets the Eye]]'' [[ArcVillain story arc]], Overlord escapes confinement and shreds his way through dozens of Autobots before Rewind [[HeroicSacrifice sacrifices himself]] to take down Overlord, though not before Overlord [[AnArmAndALeg rips all of his limbs off]] then bites his head in two, all of which he later taunts Rewind's spouse with. In his final appearance, Overlord once again oversees a horrifying war campaign against the Autobots, culminating in [[BadBoss him ditching his allies to their fates]] when he grows bored of the proceedings. Overlord is an abomination of a Decepticon who horrifies and disgusts everyone he meets, his own teammates included, something he laughs about every chance he gets.
* ''[[ComicBook/TheTransformersMoreThanMeetsTheEye More Than Meets the Eye]]'':
** [[AxCrazy Pharma]] is a former [[MadDoctor Autobot Medic]] who [[FaceHeelTurn went evil]]. After saving one of the main character's lives, he became the head medic at a medical facility on the planet Delphi. There he received death threats from an elite Decepticon unit who threatened to overrun the place, and [[WellIntentionedExtremist began bribing them with organs]], first from dead bots but later he began killing living ones. Eventually [[JumpingOffTheSlipperySlope it becomes too much]], and he has two other Decepticons unleash a plague on the facility to kill everyone and cover up his crimes. 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 [[DisneyVillainDeath being thrown off the facility]]. He survives the fall and is recruited into the group of Chief Justice Tyrest, 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. When he finds Ratchet again, he separates Ratchet's head and spark from his body and starts torturing him. To prove he is a better medic, he has one of his co-workers from Delphi, Ambulon, [[HalfTheManHeUsedToBe sliced in half]], vertically from head to crotch, with a {{chainsaw|Good}}, and tells Ratchet to fix him. Ambulon dies in agony before the chainsaw leaves him. Later Pharma shoots Brainstorm.
** [[PsychoPsychologist Froid]], originally a [[FriendlyRivalry friendly rival]] of Rung's, [[WeUsedToBeFriends destroyed their friendship]] when he plagiarized his work, and damaged his reputation. Later in his career, he assisted in the capture of a SerialKiller named Sunder, along with his accomplice and brother Spectre. However, while on a prison ship taking the brothers to Garrus 6, the brothers pulled a successful escape, with Froid as their hostage, though Spectre was killed as a result. After the escape, Froid offered Sunder a perverse offer: in return for Sunder serving as a subject for him to study, Froid would help him cope with the death of his brother and supply him with victims. After convincing Sunder he needed to see his victims in order to feed on them, Froid [[EyeScream removed Sunder's eyes]] to inhibit his appetite. Held up on the planet Scarvix, Froid become rich and famous due to Sunder's abilities to read memories without a patient knowing, all while handing innocence Cybertonians to the madman. After coming across the ''Lost Light'', Froid boarded the ship, looking for new victims for Sunder. After reuniting with Rung, he attempted to blackmail his one-time friend into giving him Rung's patient files. When Rung refused, he decided to feed him to Sunder, giving the SerialKiller his eyes as Skids to rushed in to warn Rung. In order to escape, Froid opened Sunder's cell, setting him free upon the ''Lost Light'' as he attempted to retreat.

''[[AC:[[WesternAnimation/StarTrekTheAnimatedSeries Star Trek]] vs. [[WesternAnimation/TheTransformers Transformers]]]]''[[AC:, by John Barber, Mike Johnson, et al.]]

''[[AC:WesternAnimation/BeastWars]]'' [[AC:(connected via BroadStrokes)]]

''[[AC:[[Anime/TransformersRobotsInDisguise Robots in Disguise]]]]'' [[AC:(dub only)]]

''[[AC:Transformers[=/=]Franchise/GIJoe]]''[[AC:, by John Ney Rieber]]

[[caption-width-right:350:Unicron, the Chaos Bringer.]]

->''"Say goodbye to the universe, Maximals! The future has changed. Yes. The Autobots lose! Evil triumphs! And you... you no longer exist!" ''

[[LongRunner Ever since the 1980s]], the [[Franchise/{{Transformers}} Robots in Disguise]] have faced various threats, both on Earth and from the farthest reaches of the galaxy. Here are [[CompleteMonster the worst of the worst]].

[[foldercontrol]]

''[[AC:[[Franchise/TransformersGeneration1 Generation 1]]]]''

[[AC:Western Animation]]

* ''WesternAnimation/BeastWars'':
** [[BigBad Megatron]] is a 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, [[WeHaveReserves considers his own allies 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; unsuccessfully ordering Dinobot to kill Quickstrike, one of Megatron's relatively more loyal soldiers, after Quickstrike lost to Dinobot in a sort of re-entrance exam into the Predacons; 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 [[OmnicidalManiac 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.
** [[EvilGenius Tarantulas]] is a schemer and [[ChronicBackstabbingDisorder backstabber]] second-to-none. Planted as TheMole in Megatron's operation by the Predacon Secret Police, Tarantulas is a cackling MadScientist, who enjoys performing gruesome experiments on his victims, and eating anything or anyone he catches in his giant webs, organic or 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. Tarantulas later 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. He tries to destroy the Ark, which would [[TimeCrash create a time paradox]] and lead to the extinction of the Transformers as a species. Ultimately betraying both sides, Tarantulas is revealed to be descended from neither Autobot nor Decepticon, and he attempts to use alien technology to [[OmnicidalManiac wipe out all factions]], swearing that when he's done with his own species, he will return and commit genocide against the aliens themselves. Void of loyalty or conscience, Tarantulas makes even his own nominal allies uneasy, a fact that he is downright proud of.
* ''[[WesternAnimation/TransformersAnimated Animated]]'':
** [[TheChessmaster Megatron]] is the cruel, ruthless [[BigBad leader of the Decepticons]] and the Autobots' worst enemy. A megalomaniac who overthrew the generally peaceful leader of the Decepticons to make them his own, Megatron spurred them into all-out war against the Autobots, leading to heavy casualties on both sides. Megatron utilized chemical weapons that wiped out entire battlefields--even his own men--and air bombings on civilians during the Great War. After resurrecting himself on Earth, having caused much destruction to regain his body, Megatron makes several attempts to invade Cybertron, culminating in him ordering Decepticon attacks on several Autobot bases throughout the cosmos while he personally invades Cybertron and destroys its Autobot leaders, planning to test his new Omega Supreme clones by first annihilating Detroit.
** [[PsychoForHire Lockdown]] is a ruthless and sadistic BountyHunter whose only loyalty is to himself. Unaligned with Autobots or Decepticons, Lockdown is indiscriminate in his prey, taking commissions from whomever is willing to pay him. To make himself more powerful, Lockdown steals upgrades from his targets, torturing them by cutting the weapons from his victims' bodies. [[LackOfEmpathy Devoid of empathy]], Lockdown sees his victims as little more than trophies, taunting them if he chances to encounter them again. [[APupilOfMineUntilHeTurnedToEvil Having once been a student of the Autobot Yoketron]], Lockdown murdered his former master in order to steal the protoforms under Yoketron's protection and sell them for his own profit. Merciless and consumed by {{greed}}, Lockdown is a sociopath who frightens and disgusts Autobots and Decepticons alike.
** [[MadScientist Meltdown]], originally Prometheus Black, is a human scientist who ended up 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 [[TransformationHorror gruesome hybrids combined with animal parts]], he also decides to kidnap Sumdac's innocent [[WouldHurtAChild 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, [[UngratefulBastard 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. 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.
* ''[[WesternAnimation/TransformersPrime Prime]]'':
** [[Characters/TransformersPrimeUnicronAndTheTerrorcons Unicron]] is an [[AbusivePrecursors ancient entity]] that shared an existence with Primus before both developed their own viewpoints and feelings towards the universe, Unicron choosing to see all life as pointless and beneath himself. Unicron [[OmnicidalManiac waged a path of destruction across the universe]], destroying countless worlds before being plunged into a deep slumber from which the Earth formed around him and gave life to humanity. Upon being awoken by Megatron's efforts, Unicron immediately [[UngratefulBastard denounces the loyal Megatron as worthless to him]], and reveals his plans to destroy the entire Earth and personally enjoy the annihilation of humankind. Although Unicron was beaten, his essence attached to Megatron, and soon takes control of Megatron's corpse—-in the process [[BarredFromTheAfterlife barring the Decepticon from the afterlife]] and keeping him as a toy to be tortured—-after which Unicron plans to destroy Cybertron as a final spite against his former brother Primus.
** Colonel Leland "[[RightWingMilitiaFanatic Silas]]" Bishop is leader of MECH, a terrorist group researching Cybertronian technology. His crimes include capturing Breakdown, torturing him, trying to have him vivisected, and removing one of his eyes; and allying MECH with Airachnid to get his hands on another Cybertronian, 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. 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, taking the name CYLAS--[[FunWithAcronyms "CYbernetic Lifeform Augmented by Symbiosis"]]--[[TranshumanTreachery betrays the human race to Megatron]]. Seeing himself as [[AGodAmI a superior being]], he razes a military base just to get Megatron's attention, then attempts to blow up everybody inside Raf's house.
** The aforementioned [[ArachnidAppearanceAndAttire Airachnid]] is a self-styled "ex-Decepticon" who spent her time in the Great War capturing, torturing, and slowly killing any Autobots she could find [[ForTheEvulz for fun]]. 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: [[EgomaniacHunter hunting endangered and soon-to-be extinct species]]—or species [[OmnicidalManiac she will make extinct]]--for sport and collecting grisly "trophies" of her kills. Should she find an attractive species that isn't endangered, she'll ensure that they are by the time she's done, deciding to make humans her new toys, starting with the teenage Jack Darby. Forced back into serving Megatron, Airachnid barely hides her dissatisfaction, [[TheStarscream trying to usurp control from Megatron at times]]. She finally breaks free when she finds an Insecticon hive, murders fellow Decepticon Breakdown along the way, and plans to use her new servants to destroy Megatron. Sadistic, merciless and terrifying while enjoying her atrocities, Airachnid is one of the worst to wear the Decepticon logo.
* ''[[WesternAnimation/TransformersRobotsInDisguise Robots in Disguise]]'': [[GreaterScopeVillain Megatronus]], once a member of the Thirteen Primes, was locked away for betraying his comrades and murdering Solus Prime. [[LeakingCanOfEvil Still having influence outside of his prison]], Megatronus causes the Decepticon prison transport ship, ''The Alchemor'', to crash on Earth, unleashing dozens of Decepticons on the planet. Contacting [[BigBad Steeljaw]], Megatronus manipulates him into releasing him from his prison, and uses his psychic powers to force one of Steeljaw's soldiers to begin amputating his own arm to convince Steeljaw to work faster. When unleashed from his prison, Megatronus betrays Steeljaw, tries to murder both him and the Autobots attempting to thwart him, and reveals he plans to use the power of Unicron and the Allspark to [[OmnicidalManiac destroy both Earth and Cybertron in one fell swoop]] as revenge for his imprisonment. [[FaceHeelTurn Perhaps once a good person]], Megatronus shed any heroic traits and replaced them with pure sociopathy and blind hatred.

[[AC:Anime]]
* ''[[Anime/TransformersSuperGodMasterforce Super-God Masterforce]]'': [[BigBad Devil Z]] is the Decepticon Emperor. Stealing 8 Transtectors to create an army of humans merged with the power of Transformers, Devil Z later intended to cast aside the Godmasters as tools. Straight up DesecratingTheDead and later torturing his minions, Devil Z happily resorts to [[NeverMyFault blaming his minions]] when he makes an error or miscalculation. Later when humanity proves themselves to be unpredictable, Devil Z decides that humanity is an existential threat and that he must KillAllHumans. When [[EvenEvilHasStandards his own subordinates think he is going too far]], he kills them without hardly a second thought, and displays absolutely no remorse for his actions.
* ''[[Anime/TransformersRobotsInDisguise Robots in Disguise]]'' (dub only): [[EvilOverlord Megatron]] is the [[BigBad leader of the Predacons]], who arrived on Earth in search of the Autobot Weapon Fortress Maximus under the pretext of raiding Earth for its energy. Upon arrival, he kidnaps Doctor Kenneth Onishi and probes his mind to find the location of Fortress Maximus. After receiving knowledge of the Autobot Protoforms, Megatron corrupts their sparks in order to create his Decepticons. Although initially AFatherToHisMen to his minions if they prove themselves worthy of respect, he [[BadBoss discards these qualities]] upon his rebirth as the Decepticon [[VileVillainSaccharineShow Galvatron]]--absorbing the energies of the Predacon Brothers against their will to power his new body immediately upon his transformation, and later reducing Scourge and the Decepticons to mindless drones for plotting to overthrow him with the use of Fortress Maximus. Galvatron's worst actions, however, came during the finale when, after surviving a battle with Fortress Maximus, he transforms into bat form and drains Fortress Maximus's energy to power himself. He then unleashes his bat swarm to brainwash human children with the goal of enslaving them and repeating the process from planet to planet until he has conquered the universe, [[WouldHurtAChild threatening to harm the children]] if Omega Supreme or the Autobots intervene. When the Autobots flee into the Space Bridge, Galvatron sends the Decepticons to pursue with the intention of destroying both groups by collapsing the Space Bridge, not caring if any Predacon gets caught in the collapse, [[ItsAllAboutMe all so he could have the entire planet to himself]].
* ''Anime/UnicronTrilogy''
** [[GreaterScopeVillain Unicron]] is a powerful and ancient Transformer who feeds upon [[PlanetEater worlds]] and the [[EmotionEater negative emotions]] of others. Disguising himself as one of Cybertron's moons, Unicron created the Mini-Cons to escalate the war between the Autobots and the Decepticons. Hoping to consume both sides once he regained enough power from their conflict, Unicron's plans were foiled when the Mini-Cons gained free will and abandoned Cybertron. Once fully awakened, Unicron attacked Cybertron, killed Starscream, and briefly stripped the Mini-Cons of their free will. After being defeated, Unicron returned by devouring the home world of Alpha Q and all of its inhabitants. When Megatron revived him, in hopes of turning him into a weapon, [[EvilIsNotAToy Unicron possessed Megatron]] and went off to [[OmnicidalManiac destroy several planets]] that Alpha Q had managed to restore.
** The aforementioned [[BigBad Megatron]], later known as Galvatron, is the brutal commander of the Decepticons. Desiring to destroy the Autobots and conquer the universe, Megatron enslaves Mini-Cons, tries to kill the Autobots' human allies, and tries destroy Earth with the Hydra Cannon. Upon his resurrection, Megatron leads his forces in destructive raids for Energon. Megatron plans to use the element to revive Unicron and use him as a weapon. Megatron uses Unicron's power to [[BadBoss subvert the wills of his followers]], notably enslaving Scorponok and Starscream. Developing [[AGodAmI a god complex]], Megatron seeks to use the Cyber Planet Keys to accelerate the Unicron Singularity's expansion to [[OmnicidalManiac end reality]] and reconstruct it [[InTheirOwnImage in his own image]].

[[AC:Comic Books (by publication date before the film adaptations)]]

* Creator/MarvelComics continuity:
** ''ComicBook/TheTransformers'':
*** [[OmnicidalManiac Unicron]] is a powerful [[PlanetEater planet-eating]] Transformer and the ArchEnemy of Primus, the creator of the Cybertronians. Millions of years ago, Primus stopped Unicron's quest to consume all of existence by trapping him within a lifeless asteroid and left to wander aimlessly through space. When Primus was shot during a fight between the Autobots and Decepticons, Unicron heard his rival's scream of pain and made a direct path towards Cybertron. Stopping to devour the planet of Ghennix and its roughly 60 billion inhabitants, Unicron reformatted three of its survivors to be his new heralds. After sending them to retrieve Galvatron from the future, Unicron tortured him in order to gain his compliance. He distracted Primus's forces by siccing his [[ManchurianAgent sleeper agents]] that were planted within Cybertron's population millennia ago. Once he finally arrived, Unicron devastated Cybertron and claimed countless lives, including [[KillTheGod Primus's]]. Unicron's rampage left lasting scars on Cybertron's surface and truly earned him the title of the Chaos Bringer.
*** [[TheCaligula Lord Straxus]] is a brutal Decepticon warlord who took over Cybertron after the departure of Megatron. During his reign, Straxus would have his troops round up any Cybertronian who did not pledge loyalty to the Decepticons and subject them to his smelting pools, where they would be melted down for spare parts while they were still alive. Upon receiving a transmission from Earth, Straxus had the neutral scientist Spanner kidnapped so he could build a space bridge for him. When the bridge started malfunctioning, Straxus [[BadBoss sent men after men to their deaths]] because he was too impatient to figure out what the problem was. He would then forcibly reconfigure Spanner's body to become part of the space bridge, [[FateWorseThanDeath leaving him in constant pain and begging for death]]. After being reduced to a severed head, Straxus [[GrandTheftMe intended to swap bodies with Megatron]] and crush him in his helpless state. When that plan failed, Straxus forcibly reformatted one of his soldiers into becoming a clone of Megatron and transferred his mind into their body. He would continue to torment the clone and eventually [[DrivenToSuicide drove him to suicide]] in his attempts to take over his body. Straxus dispensed no mercy to all sides of the conflict, and promised only death to those who stood in his way.
*** [[MadScientist Flame]] is an Autobot scientist who was kicked out of his academy in disgrace after proposing a revival of Megatron’s plan to turn Cybertron into a mobile spacecraft. Bitter over his rejection, Flame ignored the warnings of his peers despite the danger his project posed to Cybertron. After discovering an abandoned engine room left behind by the Decepticons, Flame faked his death and continued his research in secrecy. When a test firing of the repaired engines destroyed a section of the city Kalis, Flame transmitted a signal that [[OurZombiesAreDifferent reanimated the corpses of his fellow Cybertronians]] and forced them to attack anyone who came close to the city. Flame refused to listen to the warnings of his former colleague, Emirate Xaaron, and tried to kill him when Xaaron attempted to shut down his reactor before it would destroy Cybertron. Flame [[LackOfEmpathy showed no remorse]] over turning the victims of his own hubris into his zombie slaves, and [[ItsAllAboutMe only cared about restoring the reputation he deservedly lost]].
** ''[[ComicBook/TransformersGeneration2 Generation 2]]'': [[VisionaryVillain Jhiaxus]] is the [[BigBad ruler]] of the Cybertronian Empire, but was [[FromNobodyToNightmare once just another Decepticon warlord]] on Cybertron. Believing the war between the Autobots and Decepticons was hindering the progress of their species, Jhiaxus abandoned his sadistic ways and left Cybertron with a legion of Decepticons. He led his empire on a campaign of conquest and genocide, [[HostileTerraforming terraforming new worlds]] and [[WouldBeRudeToSayGenocide wiping out any "inferior beings"]] that happened to get in their way. When the Autobots began attacking his outposts, Jhiaxus focused his efforts on eliminating this new threat to his empire. Declaring war on both the Autobots and Decepticons, Jhiaxus's cruel nature began resurfacing as he ordered the slaughter of numerous species to lure the Autobots out of hiding. He managed to track down the base of the Autobots and Decepticons, and [[WeHaveReserves sent wave after wave of his men]] to wipe them all out. When Optimus Prime warned him about the arriving threat of the Swarm, Jhiaxus ordered the destruction of San Francisco simply out of spite. Jhiaxus ordered a second strike that would kill his own men, and crushed the head of a soldier who suggested they retreat. Jhiaxus [[NeverMyFault blamed Optimus for his empire falling apart]] and refused to believe he was still just as much of a petty tyrant as he was back on Cybertron.
** ''[[http://web.archive.org/web/20070704093846/http://www.transforce.org.uk/alignment.pdf Alignment]]'' unlicensed continuation, by Creator/SimonFurman himself: The [[GreaterScopeVillain Liege Maximo]] finally [[BigBad takes center stage]] as the final threat that the Autobots and Decepticons had to face. One of the original Transformers created by Primus, the Liege Maximo coveted its divine power and wished to become [[AGodAmI a god equal to its creator]]. After creating the Decepticons, the Liege Maximo left Cybertron and formed the Cybertronian empire, who were responsible for wiping out countless species during their conquests. The worlds they conquered were added to the Hub, which would open a portal that would ascend the Liege Maximo to godhood while destroying the universe in the process. After being discovered by an Autobot scout ship, the Liege Maximo ordered its fleet to destroy the Autobots and Decepticons before they could intervene with its plans. It [[YourSoulIsMine harvested the sparks]] of its own followers to open the portal, and killed several more Transformers who stood in its way. [[LackOfEmpathy Utterly indifferent]] to lives that suffered at its hands, the Liege Maximo embraced its dark nature on its path to godhood.
* [[ComicBook/TransformersGenerationOne Dreamwave]] ''[[ComicBook/TransformersGenerationOne Generation 1]]'' [[ComicBook/TransformersGenerationOne Series]]:
** [[TheAntichrist Megatronus Prime]], debuting here, is known as [[FallenAngel the Fallen]]. Created by Primus as one of the original Thirteen Primes, the Fallen became obsessed with the notions of [[OmnicidalManiac entropy and decay]], ultimately attempting to murder his creator after betraying him to [[PhysicalGod Unicron]]. Escaping the 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 "casualties in the wars of the Gods". Sharing his master's unquenchable thirst for destruction, [[TheDragon The Fallen]] is precisely the kind of servant that Unicron most needs.
** [[InsaneAdmiral General Robert Hallo]] was the head of military development for the United States Army. Obsessed with the idea of controlling the Transformers, Hallo had Adam Rook create a program that could remove the free will from Transformers, and hatched a plan to blow up the ''Ark II'' and gain a new robot army. After [[HeKnowsTooMuch killing a man who attempted to blow the whistle on the plan]], Hallo successfully destroyed the ''Ark II'', killing all the humans on board and sending the Autobots and captured Decepticons into the Arctic Ocean. However, Adam decided to keep the program for himself, and disappeared not long after. Years later, after discovering Rook has been using the program to build a criminal empire, Hallo convinced Spike Witwicky to revive Optimus Prime. However, when showed that he had free will and refused to follow Hallo's orders, he had Optimus, his Autobots and the Decepticons hit with an air strike, intending to kill them all. Unfortunately for Hallo, not only did they survive, an enraged group of Decepticons began rampaging through San Francisco. To be rid of the Transformers once and for all, Hallo ordered the city to be nuked, and when Spike burst in to stop him, Hallo holds him at gunpoint and [[ForcedToWatch forces him to watch]] as the city and Transformers are destroyed. When Spike accused him of only caring about power, [[CardCarryingVillain Hallo agreed with him]], saying power is the only thing keeping [[KnightTemplar Spike and his family safe]].
** The aforementioned Adam Rook, aka Lazarus, is just as bad. After designing a program that would [[SlaveryIsASpecialKindOfEvil remove the free will from Transformers]], Adam decided to render the deaths of everyone aboard the ''Ark II'' meaningless by stealing the program and disappearing before Hallo had a chance to use it. Motivated by {{greed}}, Adam took the name Lazarus and built a criminal empire, using the program to [[ArmsDealer force Transformers to work for dictators and terrorists]], helping them stomp out their enemies without casualties on their side. He even forced good guys like Bumblebee, Ratchet and Ironhide to work for killers. Sometimes, he would take "customers" on tours of his base, and would make the Transformers kneel to him to show his power over them. After three years of running this successful criminal empire, Lazarus had a group of Transformers slaughter an oil refinery in the Arctic as a demonstration to potential buyers, and [[LackOfEmpathy casually began auctioning off all of them not long after]].
* ''Transformers/Franchise/GIJoe'', by John Ney Rieber: [[BigBad Cobra Commander]] continues to prove himself capable of being an irredeemable psychopath when it comes to adaptations of his [[WesternAnimation/GIJoeARealAmericanHero original iteration]]. With Cobra serving as [[ANaziByAnyOtherName a stand-in for the Nazi Party]], Commander runs his empire with the same cruel egomania that the Nazis were known for. After discovering the Decepticons hidden in an ancient monastery whose inhabitants he has just had slaughtered, Commander forcefully takes control of the Decepticons and forces them to lay waste to numerous countries across Europe, including Berlin and Rome. Any survivors of these massacres, including the children, are forced into slave camps, and, later, used as {{human shield}}s against the Commander's enemies. After forcing a Decepticon to exhaust all his energy in wantonly laying waste to enemies and allies alike, the Commander reveals his plan to use the Decepticons to institute a new world order under his rule where only the strong will survive and serve under his thumb. Cobra Commander is a megalomaniac whose status as a stand-in for [[UsefulNotes/AdolfHitler the Nazi leadership]] makes him one of the most realistic, and wicked, baddies throughout the ''G.I. Joe'' franchise.
* Creator/{{IDW|Publishing}} ''[[Franchise/TransformersGeneration1 Generation 1]]'' continuity
** [[AxCrazy Overlord]], debuting as the BigBad in ''[[ComicBook/TheTransformersLastStandOfTheWreckers Last Stand of the Wreckers]]'', is without a doubt the most depraved Decepticon to ever grace Megatron's ranks. Though [[SuperSoldier always a terrifying force of savagery]], [[TheDreaded known and feared by friend and foe alike due to his psychotic brutality on the battlefield]] where he [[BloodKnight regularly slaughters dozens of enemies with his bare hands]], Overlord's truly wicked nature comes out in full when he is sent to Garrus-9 to oversee the rescue of Decepticon prisoners. Deciding instead to [[TheCaligula take over the entire planet]], Overlord executes the current Decepticon general, alongside any of his supporters, before turning the planet into a hellish [[POWCamp concentration camp]] occupied by hundreds of Autobot prisoners. Overlord [[{{Sadist}} takes sick pleasure]] in the various atrocities he perpetrates against his defenseless prisoners, from dismemberment, to public executions, to "releasing" them, then chasing them across the planet in "hunts", all of which he subjects his own troops to should they annoy him. Having a pathological fear of defeat, Overlord's entire motive stems from [[EvilIsPetty always losing to Megatron in sparring matches]], and to ensure he can't "lose" to the Wreckers when they come to rescue his prisoners, Overlord has all 50 of the surviving prisoners executed. Returning later in the ''[[ComicBook/TheTransformersMoreThanMeetsTheEye More Than Meets the Eye]]'' [[ArcVillain story arc]], Overlord escapes confinement and shreds his way through dozens of Autobots before Rewind [[HeroicSacrifice sacrifices himself]] to take down Overlord, though not before Overlord [[AnArmAndALeg rips all of his limbs off]] then bites his head in two, all of which he later taunts Rewind's spouse with. In his final appearance, Overlord once again oversees a horrifying war campaign against the Autobots, culminating in [[BadBoss him ditching his allies to their fates]] when he grows bored of the proceedings. Overlord is an abomination of a Decepticon who horrifies and disgusts everyone he meets, his own teammates included, something he laughs about every chance he gets.
** ''[[ComicBook/TheTransformersMoreThanMeetsTheEye More Than Meets the Eye]]'':
*** [[AxCrazy Pharma]] is a former [[MadDoctor Autobot Medic]] who [[FaceHeelTurn went evil]]. After saving one of the main character's lives, he became the head medic at a medical facility on the planet Delphi. There he received death threats from an elite Decepticon unit who threatened to overrun the place, and [[WellIntentionedExtremist began bribing them with organs]], first from dead bots but later he began killing living ones. Eventually [[JumpingOffTheSlipperySlope it becomes too much]], and he has two other Decepticons unleash a plague on the facility to kill everyone and cover up his crimes. 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 [[DisneyVillainDeath being thrown off the facility]]. He survives the fall and is recruited into the group of Chief Justice Tyrest, 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. When he finds Ratchet again, he separates Ratchet's head and spark from his body and starts torturing him. To prove he is a better medic, he has one of his co-workers from Delphi, Ambulon, [[HalfTheManHeUsedToBe sliced in half]], vertically from head to crotch, with a {{chainsaw|Good}}, and tells Ratchet to fix him. Ambulon dies in agony before the chainsaw leaves him. Later Pharma shoots Brainstorm.
*** [[PsychoPsychologist Froid]], originally a [[FriendlyRivalry friendly rival]] of Rung's, [[WeUsedToBeFriends destroyed their friendship]] when he plagiarized his work, and damaged his reputation. Later in his career, he assisted in the capture of a SerialKiller named Sunder, along with his accomplice and brother Spectre. However, while on a prison ship taking the brothers to Garrus 6, the brothers pulled a successful escape, with Froid as their hostage, though Spectre was killed as a result. After the escape, Froid offered Sunder a perverse offer: in return for Sunder serving as a subject for him to study, Froid would help him cope with the death of his brother and supply him with victims. After convincing Sunder he needed to see his victims in order to feed on them, Froid [[EyeScream removed Sunder's eyes]] to inhibit his appetite. Held up on the planet Scarvix, Froid become rich and famous due to Sunder's abilities to read memories without a patient knowing, all while handing innocence Cybertonians to the madman. After coming across the ''Lost Light'', Froid boarded the ship, looking for new victims for Sunder. After reuniting with Rung, he attempted to blackmail his one-time friend into giving him Rung's patient files. When Rung refused, he decided to feed him to Sunder, giving the SerialKiller his eyes as Skids to rushed in to warn Rung. In order to escape, Froid opened Sunder's cell, setting him free upon the ''Lost Light'' as he attempted to retreat.
* ''[[ComicBook/TransformersShatteredGlass Shattered Glass]]'': [[AxCrazy Ultra Magnus]] was locked up in his universe for trying to usurp Optimus Prime, getting his face ripped off in the process. He and several others travel to earth, where he assimilates numerous Autobots into the Junkion hordes, resulting in them 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 [[OmnicidalManiac cause the death of the entire universe]]. Even the normal Decepticons turned against him, as they wanted to be the conquerors, and [[EvenEvilHasStandards were appalled]] when they realized the extent of the damage.
* ''WesternAnimation/TransformersPrime: Beast Hunters'' comic: [[TheSocialDarwinist Airwave]], from the first two issues, is an Autobot, who after the Great Civil War [[FaceHeelTurn abandoned the Autobots' ideals]] in favor of an "everyone out for himself" philosophy, due to believing that Optimus Prime and the others left them to die on Cybertron. Forming one of the Autobots cities underground, called Lost Spark, Airwave found an easy way to get Energon for himself by secretly killing his own followers and then draining their bodies of Energon in the morgue. Thus killing several dozen of his own people and closest friends, Airwave planned to feast on all inhabitants on the Lost Spark, until he was discovered by Sludge and Snarl, after which he shot Firestar in the back and framed them for it, leading to his followers attacking them. Trying to kill Sludge and Snarl, Airwave didn't care when he killed dozens of his own people in the crossfire.
* ''[[WesternAnimation/StarTrekTheAnimatedSeries Star Trek]] vs. [[WesternAnimation/TheTransformers Transformers]]'', by John Barber, Mike Johnson, et. al: Megatron is once again portrayed as a power-mad tyrant. With the Autobots fleeing Earth with the breakout of WorldWarIII, Megatron and the Decepticons pursue them, resulting in a battle where both sides end up in stasis on a remote planet. Centuries later, a Federation mining team accidentally revives the Autobots and the Decepticons, resulting in the Decepticons attacking the Federation mining colony. Optimus Prime and the Enterprise crew team up and drive off the Decepticons, but Megatron meets and teams up with the Klingons. The Klingons and Decepticons renew their attack on the Federation mining colony, not caring how many Federation colonists die in these attacks. When Starscream flees to Kornos to conquer it, Megatron and the Decepticons pursue Starscream to Kornos. Megatron defeats Starscream and claims Kornos for himself so that he can enslave the Klingons and use their resources to launch a war of conquest against the Federation. [[ProudWarriorRaceGuy When the Klingons refuse to surrender]], Megatron orders his forces [[FinalSolution to annihilate all the Klingons]].
* Creator/{{IDW|Publishing}} [[Film/TransformersFilmSeries Film Adaptations]]:
** ''[[Film/TransformersRevengeOfTheFallen Revenge of the Fallen]]'': [[BigBad The Fallen]] himself is portrayed as even worse than his film counterpart. Once a member of the Thirteen Primes, The Fallen came to believe [[AGodAmI he was destined to become the most powerful of his brothers]] by re-powering the Allspark, then using it to make himself all-powerful. Using the Star Harvester, The Fallen drains the energy from a sun, uncaring that it leads to an entire planet dying, and blames it on one of his own servants when confronted about it. After attempting to use the Star Harvester once more, The Fallen comes to the realization that he no longer needs his Prime "brothers" or the Allspark, prompting instead to travel the universe searching for sentient life, then [[OmnicidalManiac slaughtering countless worlds of their sentient species]], [[TheCollector absorbing the knowledge, weapons, and strategies]] of the billions he slays as he goes along. After butchering his Prime brothers, The Fallen attempts to use the Star Harvester to [[EarthShatteringKaboom wipe out the entire Earth]], [[{{Sadist}} taking extra time to crush humans underfoot while laughing]]. Though [[SealedEvilInACan sealed away for thousands of years]], The Fallen continues his wicked ways, as he [[TheManBehindTheMan reaches out]] and [[TheCorrupter corrupts]] the noble Megatron into waging a war against Optimus Prime and the Autobots, leading to countless deaths and the destruction of Cybertron itself. The Fallen hopes to return to Earth and use the Star Harvester to destroy it for good this time, solely as a final act of spite toward his brothers.
** ''[[Film/TransformersDarkOfTheMoon Dark of the Moon]]'':
*** [[AdaptationalVillainy Unlike in the film]], [[PsychoForHire Shockwave]]--also in the ''Foundation'' and ''Rising Storm'' prequel comics--is portrayed as a brutal and remorseless Decepticon assassin. Initially a follower of Sentinel Prime, Shockwave expressed disgruntlement with an age of peace and freedom and, as part of Megatron's Defense Force, eagerly massacred dissenting Cybertronians. After joining the Decepticons, Shockwave earned a reputation as [[TheDreaded Megatron's most lethal subordinate]], openly admitting to [[LovesTheSoundOfScreaming enjoying the sounds of Autobots dying]]. Left in command of the Decepticons on Cybertron whilst Starscream searched for the Allspark, Shockwave waged a brutal campaign against the remaining Autobots, killing, amongst others, the Autobot Chromia. On Earth, Shockwave murders the Autobots Longarm and Salvage, as well as the entire crew of an oil processing plant, without provocation. Enslaving the drone who would later become "Brains" to build a "cage" for his Driller, Shockwave openly plans to terminate him [[YouHaveOutlivedYourUsefulness when he is no longer useful]]. When Brains escapes, Shockwave tracks down Starscream's Decepticon splinter group, casually killing Deadlift simply for [[DisproportionateRetribution being in his way]], and conscripts them into tracking Brains down. Shockwave then goes on a killing spree in the NEST base in Diego Garcia, killing all the personnel, human and Autobot alike, including traumatized Autobot refugees. [[LackOfEmpathy Devoid of empathy]], Shockwave mocks Elita-One's death at his hand to Prime's face and, later, sadistically taunts Prime about the Autobots that Shockwave killed during their encounter in Chernobyl. Even the death of the Driller, his [[UndyingLoyalty loyal]] pet, fails to rouse any emotion from Shockwave, who treats its death as an inconvenience. A merciless sadist who revels in killing, Shockwave terrifies Autobot and Decepticon alike.
*** Dylan Gould, [[AdaptationalVillainy unlike in the film]], is portrayed as a sadistic psychopath with delusions of grandeur. Having willingly allied with Decepticons years back, Gould covers up the Decepticons' plans and presence from the public eye, having anyone who attempts to learn the truth murdered by his personal Decepticon attack dog, [[FeatheredFiend Laserbeak]]. Once the Decepticons reveal themselves and attack the Earth, Gould uses Sam Witwicky to spy on the Autobots under threat of slaughtering his girlfriend, Carly, and giddily gives the order for the Autobots to be shot down while they are attempting to leave the Earth. Masterminding the invasion of Chicago, Gould has the Decepticons kill countless people and destroy much of the city while turning it into a fortress. Gould ultimately plans to assist the Decepticons in transporting as much of humanity to Cybertron as possible, then use them as slaves to rebuild Cybertron while Gould [[AGodAmI lords over them as their master]]. Even when the Autobots and humans begin defeating the Decepticons, Gould still activates the portal to bring Cybertron to Earth, completely eliminating any possible claims he had to not being fully complicit in the Decepticons' actions. [[FauxAffablyEvil Always wearing a smile and having a witty quip on hand]] to cover up his [[ItsAllAboutMe raving egomania]], Gould truly [[HumansAreTheRealMonsters represents the very worst humans have to offer]].
[[/folder]]

[[AC:Live-Action Films]]
* ''[[Film/TransformersRevengeOfTheFallen Revenge of the Fallen]]'': The Fallen, also known as [[SatanicArchetype Megatronus Prime]], is this film's BigBad and the film universe's first Decepticon. Originally one of the 7 members of the Dynasty of Primes, The Fallen betrayed his brothers and attempted to use the Star Harvester on Earth's Sun regardless of the Dynasty's code against taking life, solely because of his FantasticRacism towards primitive humankind. Eons after his defeat, The Fallen corrupts Megatron, creates the Decepticons, and orders him to find the All Spark, [[GreaterScopeVillain making him responsible]] for the events of the first film. After he lures Optimus Prime to his death using Sam as bait, The Fallen sank an aircraft carrier, attacked several human cities, and slaughtered a sizable military force while acquiring the Matrix of Leadership to activate the Star Harvester again, fully intending to [[OmnicidalManiac wipe out the human race]].
* ''[[Film/TransformersAgeOfExtinction Age of Extinction]]'': 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, [[NotSoWellIntentionedExtremist Attinger]] may come across as well-intentioned, 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 a {{hypocrite}}, if not merely a StrawHypocrite, out to get rich.
* ''Film/{{Bumblebee}}'': [[BigBadDuumvirate Shatter and Dropkick]] are a pair of Decepticons out to hunt down and kill Optimus Prime. [[EstablishingCharacterMoment Introduced]] torturing and murdering the Autobot Cliffjumper, the two arrive on earth where Dropkick kills a human simply for fun. Directed to the human authorities, the two claim to be peacekeepers hunting down a criminal to give them access to humanity's satellites. After capturing and torturing Bumblebee, the two murder a doctor who was helping them, revealing their intent to bring their forces down on Earth and [[KillAllHumans kill every human being]], not stopping until the planet is a cinder. A vicious pair of BrainsAndBrawn, Shatter and Dropick embody the worst of the Decepticons.

[[AC:Literature]]
* ''[[Film/TransformersDarkOfTheMoon Dark of the Moon]]'': In the {{novelization}} by Creator/PeterDavid, Sentinel Prime [[AdaptationalVillainy loses all of his film counterpart's redeeming features]], turning the somewhat-sympathetic WellIntentionedExtremist into a psychopathic KnightTemplar. Having made a deal with Megatron eons ago to [[FaceHeelTurn betray his allies the Autobots]], Sentinel fulfills this deal in the present after pretending to assist the Autobots, showing his true colors by ruthlessly executing three of his "brothers." Sentinel steals the Pillars from the military group NEST by threatening its director, Charlotte Mearing, stating that if she doesn't give him the Pillars, he will force her to watch as he slaughters every man, woman, and child he can until she does. Lying to humanity to get them to force the Autobots to leave Earth in exchange for Sentinel's offer of peace, Sentinel [[ILied goes back on his word]], orchestrating a full-scale invasion of Earth by the Decepticons and personally overseeing the blood-soaked conflict in Chicago. Sentinel ultimately plans to transport as many humans to Cybertron as possible, then torture and abuse them into reconstructing Cybertron, leaving [[KillAllHumans the rest of humankind]] to be destroyed alongside the Earth by Cybertron's gravitational field. In the end, Sentinel treats the deaths of Autobot and Decepticon alike with cold satisfaction, proclaiming that [[AGodAmI he will be the only god left on Cybertron]] when the dust settles, proving once and for all that, despite his claims of wanting the best for his people, Sentinel truly [[ItsAllAboutMe only cares for himself and his supposed claim to godhood]].

[[AC:Video Games]]
* ''[[VideoGame/TransformersTheGameDS The Game]]'' [[VideoGame/TransformersTheGameDS (DS)]]: [[BigBad Megatron]] lacks his [[Film/{{Transformers}} film]] counterpart's nobler traits and [[AdaptationalVillainy replaces it with raw brutality]]. Having plunged Cybertron into civil war after killing his own father, Megatron tore out Bumblebee's vocal processor when he launched the Allspark into space. He followed the Allspark to Earth, but wound up frozen in the Arctic Circle. After being thawed out by his followers, Megatron's murderous rage was only tempered when they planned to blow up Hoover Dam and drown thousands of people. In ''Autobots'', Megatron used the Allspark to terrorize the city of Tranquility and mortally wounded Create-A-Bot while trying to kill his own brother, Optimus Prime. In ''Decepticons'', he tracked down and murdered Jazz after he foiled his plot to destroy Hoover Dam. After terrorizing Tranquility, Megatron killed Optimus and hunted down his traitorous lieutenant Starscream. Create-A-Con was gravely wounded after helping him defeat Starscream, and Megatron [[UngratefulBastard chose to kill him rather than waste resources trying to repair him]]. Megatron showed no remorse for the Decepticons who gave their lives for him and [[TheSocialDarwinist believed that the weak were only meant to serve the strong]].

* ''[[VideoGame/TransformersFallOfCybertron Fall of Cybertron]]'' & ''[[VideoGame/TransformersRiseOfTheDarkSpark Rise of the Dark Spark]]'': [[MadScientist Shockwave]] is one of the highest ranking Decepticons in [[BigBad Megatron]]'s army, who is responsible for many of their inventions. After Megatron sent him to track down the ancient artifact called the Dark Spark, Shockwave managed to enslave Insecticons to his will and captured Cliffjumper, planning to experiment on him later. Succeeding in getting the Dark Spark, Shockwave helped Megatron use it to revive the dead Autobots, while planning to capture and experiment on many more Autobots. After that, Shockwave captured and experimented on countless Autobots and Insecticons, dissecting them in his labs. Forcing his Decepticon underlings to work with the Insecticons, despite the wild nature of the beasts, Shockwave didn't care that this led to them slaughtering each other. Getting his hands on Grimlock and his Lightning Strike team, Shockwave performed numerous especially brutal experiments on them, hoping to wipe their mind and rebuild them as his own foot soldiers. After Grimlock freed himself, Shockwave sent hundreds of his own underlings and Insecticons to get slaughtered, simply as a way to test Grimlock's abilities.
* ''[[VideoGame/TransformersRiseOfTheDarkSpark Rise of the Dark Spark]]'': [[BigBad Lockdown]] is a bounty hunter searching for the titular [[MacGuffin Dark Spark]]. After discovering that it has landed on Earth, he and his army of mercenaries attack a city in their quest to find it, and also torture Drift and nearly kill him and Bumblebee after they interfere. Once he acquires the Spark, Lockdown and his army later attack a second city so he will [[TimeTravelForFunAndProfit gain access to a time bridge]] hidden underground. As he prepares to activate the bridge, he gloats to Optimus Prime about how he plans on using the bridge to bring the Decepticons down to Earth, which would reignite another Cybertronian civil war that would result in the Earth being destroyed. [[PsychoForHire Relishing in his profession]], Lockdown nearly started another galactic war that would've killed millions of humans and Cybertronians alike, [[WarForFunAndProfit all so he could satisfy his greed]].
* ''[[VideoGame/TransformersDevastation Devastation]]'': [[BigBad Megatron]] is the ruthless leader of the Decepticons, who waged war against the Autobots for millions of years, leading to his own homeworld Cybertron becoming uninhabitable. Constantly trying to [[TakeOverTheWorld take over Earth]], Megatron soon discovered the Autobot ship Proudstar, which was designed to cyberform uninhabited planets and started to [[HostileTerraforming cyberform New York City]]. Taking over that ship, Megatron creates a plan to use its Ferrotaxis supercomputer to speed up the process and cyberform the entire Earth, killing all organic life on it, which he [[FantasticRacism openly considers inferior]]. Repeatedly thwarting the Autobots' attempt at stopping the cyberformation process, including launching unstable core of the ship outside of New York, which could have caused an extinction-level explosion, Megatron shoots Ferrotaxis into space to keep the Autobots from getting it. When Optimus Prime managed to reach it, Megatron battles him, openly announcing his intention of creating the new Cybertron and [[GalacticConqueror retaking the galaxy in a bloody conquest]].

[[caption-width-right:350:Unicron, the Chaos-Bringer.]]

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

* ''[[VideoGame/TransformersDevastation Devastation]]'': [[BigBad Megatron]] is the ruthless leader of the Decepticons, who waged war against the Autobots for millions of years, leading to his own homeworld Cybertron becoming uninhabitable. Constantly trying to [[TakeOverTheWorld take over Earth]], Megatron soon discovered the Autobot ship Proudstar, which was designed to cyberform uninhabited planets and started to [[HostileTerraforming cyberform New York City]]. Taking over that ship, Megatron creates a plan to use its Ferrotax supercomputer to speed up the process and cyberform the entire Earth, killing all organic life on it, which he [[FantasticRacism openly considers inferior]]. Repeatedly thwarting the Autobots' attempt at stopping the cyberformation process, including launching unstable core of the ship outside of New York, which could have caused an extinction-level explosion, Megatron shoots Ferrotax into space to keep the Autobots from getting it. When Optimus Prime managed to reach it, Megatron battles him, openly announcing his intention of creating the new Cybertron and [[GalacticConqueror retaking the galaxy in a bloody conquest]].