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->''"Once again Rangers, you're too late. There's no stopping me this time. All three drills have already...[started] digging into the Earth's core...to usher in the coming darkness than with a solar eclipse...[which]...will unleash the darkest of my powers...This planet will meet its end as it deserves, in darkness and despair!"''
-->--'''Vrak''', ''[[Series/PowerRangersMegaforce Power Rangers Super Megaforce]]'', "[[Recap/PowerRangersSuperMegaforceS2EP17VrakIsBackPart2 Vrak is Back, Part 2]]"

Though ''Franchise/PowerRangers'' is a children's series, it isn't free of this trope and it features some villains [[CompleteMonster who are particulary evil and despicable]].

* [[ManipulativeBastard Darkonda]], unlike many villains in The Zordon Era (first six seasons), had no qualities or [[EvenEvilHasLovedOnes loved ones]] to balance his evil. This sadistic and ruthless BountyHunter feigned loyalty so he could manipulate his way to becoming "[[TheStarscream King Darkonda]]. Years before the series began, he was tasked to kidnap the young Karone and stop her dream of becoming a Power Ranger by having her memories altered and raised to be the villainous Astronema. When her older brother, Andros, learned it was Darkonda who kidnapped her, Darkonda [[CardCarryingVillain proudly boasted that it was one of his finest accomplishments]], frequently [[KickTheDog bragging about it to Andros]] [[ForTheEvulz for enjoyment]]. He was also involved in causing KO-35s population to abandon their colony, using methods as the Barillian Bug infestation; he took the planet and its riches for himself. His crimes in the series proper include using the same bug creatures to infect the Rangers; forcibly [[FusionDance fuse with his rival Ecliptor and use him a shield]]; and attacking the survivors of KO-35 with a monster that turns victims into coral whilst [[FrameUp framing the Rangers for it]]. When Astronema learned the truth and Ecliptor [[UndyingLoyalty refused to betray her]], Darkonda mortally wounded him and had him turned into a {{cyborg}}, with implants that prevented him from rebelling. When they recapture Karone, Darkonda has cyber implants forcefully put on her, [[BrainwashedAndCrazy completely erasing any goodness in her]]. In the final episode, he makes his last bid for power by directly attacking [[GreaterScopeVillain Dark Specter]] with two torpedoes capable of destroying a planet. He fails and Dark Specter [[EatenAlive devours him]] while being destroyed by the last torpedo, crippling the evil forces. A [[ItsAllAboutMe power-hungry]], [[ChronicBackstabbingDisorder untrustworthy]], gleefully evil psychopath who endangers all around him whilst lacking a single redeeming quality, Darkonda is one of the vilest creatures in Power Rangers history.

* [[NamesToRunAwayFromReallyFast Deviot]], in a show full of [[EvenEvilHasStandards villains with standards]], had none. He was a [[ManipulativeBastard manipulative]], treacherous [[TheStarscream Starscream]] who would cheerfully throwaway his men's lives, thought brainwashing was a useful tool, and had no loyalty to anyone. When [[DiscOneFinalBoss Scorpius]] wouldn't allow him to enter the cocoon, Deviot arranged for his death. When [[DaddysLittleVillain Trakeena]], and not he, inherited control of the army, he sends two of his men to kill her; when she survives the assassination attempt, he kills the assassins to cover his tracks. He later brainwashed [[OldSoldier Loyax]] into fighting the Rangers, leading to his death as well. Deviot ambushes Trakeena, forces her into the cocoon, and fuses with her. The absorption of his evil soul drives Trakeena completely over the edge, leading her to murder her {{mentor}}, [[NobleDemon Villimax]], use her men as suicide bombers, and try to regain her human form by stealing the LifeEnergy of others. Totally untrustworthy, and out only for himself, Deviot proved that on his own, or influencing Trakeena, he could do more damage than any other villain in ''Lost Galaxy''.

* [[BigBad Queen Bansheera]] is the [[GodSaveUsFromTheQueen queen of the demons]] and by far the worst of their ilk. Bansheera desires to rule the world and recreate her castle and has no care for any of her minions, being one of the [[BadBoss worst bosses]] in the entire franchise. To return to power she callously absorbs her loyal minion Vypra for [[YouHaveFailedMe failing her]]. She later forces her general Diabolico to open fire on his enemies without caring that her most loyal minion Loki, whose only desire has ever been to serve her, is caught in the blast and dies. When he goes against her, Diabolico has his mind forcibly erased to serve as her unwilling pawn. She also shows little regard for her own son Olympius and ordered him abandoned to his fate while laughing. She later has him forced to fight alongside a brainwashed Diabolico, and his death [[LackOfEmpathy provokes no feeling in her whatsoever]]. In the finale, Bansheera attempts to open a gateway to the demon realm allowing all demon-kind to pour out and overwhelm humanity, even attempting to drag Carter Grayson down to the demon realm with her after she fails. Bansheera is one of the franchise's cruelest villains and does her evil for her own selfish ambitions.

* [[BigBad Dr. Viktor Adler]] was [[FromNobodyToNightmare once a kind ecologist]]. After his crush married his colleague, he became [[GreenEyedMonster jealous and paranoid]]. Eating the remains of [[GreaterScopeVillain Master Org]], he used his new powers to [[MoralEventHorizon murder the couple]] and [[WouldHurtAChild attempted to murder their baby son]]. [[EvilIsPetty Hating nature because it reminded him of their "betrayal"]], he revived Master Org's plot to destroy all non-Org life. Reacting to defeats badly, it was common to see him [[BadBoss destroying Org statues in fits of rage, murdering dormant Orgs in temper tantrums]]. When [[UndyingLoyalty Retinax]] didn't recognize him Adler killed him, and when Toxica and Jindrax discover his secret he brainwashes them. His worst act is slowly killing Cole's friends while fighting Cole just because he was the son of the couple he was jealous of, claiming he'd enjoy their suffering "even more than [his] parents!" Reviving the three General Orgs as slaves bound to his will, he ate the Org Heart to make himself invincible, seeking to cover the world in black clouds that spawn {{mooks}} to [[KillAllHumans destroy humanity]]. A petty, jealous and cruel man who has long stripped himself of any good, Adler is one of PowerRangers' most evil [[HumansAreTheRealMonsters humans]] and one of its [[KnightOfCerebus darkest characters]].

* TheMaster, whose [[AllThereInTheManual real name]] is [[KnightOfCerebus Octomus]], is a [[EldritchAbomination demonic entity]] intent on [[OmnicidalManiac destroying everything good]]. Prior to the start of the series he brainwashed Leanbow into becoming his loyal servant [[BrainwashedAndCrazy Koragg]]. Once he [[SealedEvilInACan emerges]], he possesses a follower who had turned good and was trying to prevent his rebirth and [[BodyHorror mutates his body into his own twisted image]]; he then [[DemonicPossession possesses Leanbow's son Nick directly]], transforming him into a much more sadistic and vicious version of Koragg who laid waste to parts of the forest and Rootcore before he was saved. After being exorcised from Nick, he attacks and destroys the Mystic Mother's palace in a matter of minutes and kills both Leanbow and Daggeron when they investigate the destruction before dropping their corpses down before the Rangers; finally he obliterates time itself, transporting the rangers to the future he plans to create where he's reduced the Earth to a barren, lifeless husk for no apparent reason other than [[ForTheEvulz because he can]].

* [[BigBad Venjix]] is a [[AIIsACrapshoot sentient computer virus]] who was created by Dr. K and became rogue after being unleashed on the world's computers. After being unleashed he would create an army of robots and use them to [[KillAllHumans exterminate 99% of the human race]]. When the last elements of humanity hole up in the domed city of Corinth, Venjix makes repeated attempts to destroy the city in order to wipe out what is left of humankind. To achieve this end, he enslaves people to work in his factories to make his machines and [[UnwillingRoboticisation forcefully roboticisies them]], even brainwashing Dillon's sister into becoming [[TheDragon Tenaya 7]]. Venjix is also a [[BadBoss user and abuser of his minions]], to the point that he will kill perfectly loyal minions for no other reason then he can and discards any henchmen he no longer needs. After Tenya goes against him, he has her forcefully turned into his loyal slave Tenaya 15. In the finale, it's revealed he's taken over the minds of half the city in order to force them into compliance with his orders. Possessed of no good qualities, and with the highest body count in the history of the franchise, Venjix is among the worst that the franchise has to offer.

* [[BigBad Master Xandred]], when he isn't drinking his [[FrothyMugsOfWater "medicine"]] and yelling at people, [[BadBoss treats his followers horribly]], yells at them, threatens to kill Octoroo at one point, attempts to kill Deker because he was meddling in his affairs, and his plan revolves around killing Jayden. Unlike Octoroo, who sends Nighloks to cause misery, Master Xandred summons an army of moogers to cause meaningless chaos in the human world and destroy everything. In episodes "Broken Dreams" and "Test of the Leader", we see that his moogers destroy entire buildings, [[FridgeHorror meaning that he is responsible for hundreds of deaths of innocent humans]]. He brutally punishes [[TheStarscream Arachnitor]] when he tried to usurp him by [[BodyHorror mutating him into a mindless berserker slave]]. [[EvenEvilHasStandards Even Octoroo says that his cruelty is boundless]]. In "Broken Dreams", he ruined Dayu's harmonium and attempted to erase her memory. She even says "I knew you were evil, but this..." Eventually, after Deker meets his FinalDeath and Dayu's sorrow is so great that she is able to fully restore Xandred on her ''own,'' [[UngratefulBastard he rewards her]] by absorbing her so that her human side would make him immune to the sealing symbol. However, by this point, Dayu didn't care if she lived or died, and didn't resist.
* [[TheChessmaster Serrator]] serves as a [[HiddenAgendaVillain mysterious Nighlok]] whose presence shifts the series into a [[KnightOfCerebus much darker tone]] . [[EstablishingCharacterMoment Introducing himself]] by giving the Rangers a NoHoldsBarredBeatdown and wiping out an army of Moogers sent by the aforementioned [[BigBad Master Xandred]], he offer his services for the latter, acting as his DragonInChief and organizing several unsavory schemes, one of which includes forcing people on an island to fight each other to the death. When Xandred's CoDragons, Octoroo and Dayu, grew wary of his loyalty to Xandred, he reveals to have only served Xandred because his plan to flood the Earth with the Sanzu River, [[DragonWithAnAgenda just happened to had been aligned with his own plan]] while admitting to [[TheStarscream betraying him]] once he has [[YouHaveOutlivedYourUsefulness outlived his usefulness]] . Serrator also admits to Dayu to have cursed her and [[spoiler:Deker]] 200 year ago when their house caught on fire. In that time Serrator made a [[DealWithTheDevil deal with Dayu]] to save [[spoiler:Deker's life]], but then tricks her by taking away his memories and turning him into human/Nighlok hybrid forced to walk the earth for all of eternity while taking away her humanity and forcing her to remember what he had done for all eternity, something that Serrator [[{{Sadist}} still takes great joy from]] even now, along with the implication of having started the fire in the first place. Eventually, he would reveal to all of his plan to cause the Earth to crack and the Netherworld to flood it, serving as an attempt to [[TakeOverTheWorld take over both worlds]], completely uncaring about the of lives lost in the process, human and Nighlok alike. Only loyal to [[ItsAllAboutMe himself]] , Serrator serves as one of the most dangerous adversaries that both heroes and villains had ever faced.

[[AC:''Series/PowerRangersMegaforce'' and ''Super Megaforce'']]

* [[DragonInChief Vrak]] is the youngest son of [[GreaterScopeVillain Emperor Mavro]], and the most dangerous and hated enemy of the Megaforce Rangers. Originally TheDragon to [[BigBad Admiral Malkor]], Vrak arrived and was the EvilGenius who came up with plans to take over the Earth. His plans involved sending a virus that turned humans into their Loogie foot soldiers and using a monster of the day's music abilities to potentially kill as many humans on the planet at once. He frequently manipulated his allies like Creepox and the Mutants, eventually leading to their ends. When Malkor is defeated and Vrak is killed in the destruction of their spaceship, his robot servant [[UndyingLoyalty Metal Alice]] finds him and brings him back as a cyborg, eventually taking a blow meant to kill him. Vrak "thanks" her [[UngratefulBastard by telling her he never cared for her before leaving her to die]]. He [[DragonAscendant resurfaced]] in the season 2 two-parter "Vrak Is Back", after his older brother, Prince Vekar, is defeated, cruelly mocking him for being too weak and actually thanking the Rangers for killing him so that he could claim the throne. Having kidnapped Robo Knight and Orion, he drained the life force of the latter, [[BrainwashedAndCrazy forcibly reprogramming the former]] to attack his former friends while constructing drills that burrow into the Earth's core. He tricks the Rangers into destroying his two remaining monsters, who become new drills to complete his plan quicker. [[LackOfEmpathy Lacking empathy for both allies and enemies]], and [[OmnicidalManiac aiming to destroy the Earth]], Vrak is one of the franchise's cruelest aliens to invade the Earth.

* ''Film/PowerRangers2017'': [[BigBad Rita Repulsa]], the former Green Ranger, was once a noble hero before her {{ambition|IsEvil}} drives her to [[FallenHero slaughter her comrades and mortally wound]] her former friend [[BigGood Zordon]]. Resurfacing countless years later, Rita descends on the fishing town of Angel Grove and starts brutally murdering innocent people for their gold to regain her powers--in one instance tearing a homeless man apart to get at his gold teeth--burning down an entire populated building to demonstrate the power of her Putties. Capturing and then killing a man to draw in the Rangers, Rita tortures the location out of Earth's Zeo Crystal out of the Rangers and then callously kills Billy (temporarily) in front of the others once [[YouHaveOutlivedYourUsefulness he wears out his use to her]]. Finally rising up a monstrous Zord of her own making that she calls Goldar, Rita starts decimating Angel Grove to find and take the powers of the Zeo Crystal. Rita's ultimate goal is nothing short of [[AGodAmI absolute godhood]] by harnessing the power of the Zeo Crystal--consequentially killing off all life on the planet, something Rita is only too gleeful to do. Barely resembling her original iteration, Rita brings a level of incredible seriousness to this [[VileVillainSaccharineShow otherwise lighthearted and fun film]] and is ultimately nothing less than a psychotic, murderous monster.