%% '''Note: Due to the controversial nature of this trope, any changes (additions, removals, edits) should be discussed [[http://tvtropes.org/pmwiki/posts.php?discussion=6vic3f9h1cy5qivsenw8llok here]].'''
%% Please read the discussion page first to see if your example or removal has already been brought up.
->''"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-35’s 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 probably the [[BadBoss worst boss]] in the history of the entire franchise. The [[GodSaveUsFromTheQueen queen of the demons]], Bansheera returns to power by callously sucking the life out of one and forces Diabolico, her once loyal general, to open fire on his enemies without caring her most loyal minion Loki, whose only desire has ever been to serve her, is caught in the blast and dies. Diabolico has his mind forcibly erased to serve as her pawn. Her own son, Olympius fares little better, and Bansheera once ordered him abandoned to his fate while laughing. He is forced to fight alongside a brainwashed Diabolico, and his death provokes no feeling in her whatsoever. In addition, Bansheera attempts to open a gateway to the demon realm, allowing all demon-kind to pour out and overwhelm humanity.

* [[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 sentient computer virus who, after being unleashed on the world's computers, proceeds to [[KillAllHumans exterminate almost the whole 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 those ends he: enslaves people to work in his factories, brainwashes Dillon's sister into becoming Tenaya 7, brutalizes his minions if they question his orders, discards any henchmen he no longer needs, and mentally hijacks 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 Power Rangers 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]] is first introduced as an Nighlok unknown to many, even Master Xandred himself, but soon gets Xandred’s attention by wiping out his army of Moogers, and then [[DragonInChief Serrator]] promises to help Xandred with his goal of flooding the Earth with the Sanzu River. [[KnightOfCerebus Serrator]] then gives the Rangers a NoHoldsBarredBeatdown every time they meet, and forces people on an island to fight each other. When Xandred's CoDragons, Octoroo and Dayu, grew suspicious of Serrator, he tries to kill them and in the process revealed he only [[TheStarscream feigned loyalty to Xandred]] to steal Dayu's Harmonium and use it for [[HiddenAgendaVillain his own plans]]. A furious Dayu [[note]]earlier Serrator promised to give back her Harmonium once he is done fixing it[[/note]] attacks Serrator only for him to [[TheReveal reveal]] that he was the one who caused all of pain and agony she and her lover, [[spoiler:Deker]], had to suffer throughout their eternal lives 200 year ago when their house caught on fire. Serrator appeared before Dayu and, seeing how badly the fire affected [[spoiler:Deker]] makes a [[DealWithTheDevil deal with Dayu]] to save Deker's life, but at the cost Dayu loosing her humanity and spending an eternity in the Netherworld. Dayu accepted, but when Serrator revived [[spoiler:Deker]], he took away his memories and turned him into human/Nighlok hybrid forced to walk the earth for all of eternity, while Dayu must be forced to remembered the deal she made that would forever ruined their lives. Serrator shows no remorse, enjoying in the fact that it cause Dayu so much suffering, and may have been the one who started the fire in the first place. Eventually, everyone, heroes and villains alike, learned that all of his attacks were in a pattern that would cause the Earth to crack causing the Netherworld to flood the Earth. His goal was to [[TakeOverTheWorld rule both worlds]], not caring about the billions of lives in both worlds lost in the process.

[[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.