History Sandbox / MonsterUltraSeries

** ''Film/MegaMonsterBattleUltraGalaxyLegends'': [[GalacticConqueror Ultraman Belial]] ("Super Galaxy Great Emperor") is a FallenHero-turned-tyrant. Ultraman Belial started off as a typical Ultraman warrior , but, due to {{greed}} and {{ambition|IsEvil}}, desired to steal the Plasma Spark powering their entire civilization; this would cause the planet to immediately freeze over, trapping all the Ultras in ice for an eternity. Belial was found out, and [[TheExile sent into exile]]...before coming back, having merged with the ancient [[EldritchAbomination Alien Rayblood]]. He went on a wild rampage before being [[SealedEvilInACan sealed away]] by Ultraman King. Unfortunately, thousands of years later an Alien Zarab sets Belial free in an attempt to form an alliance with him. [[UngratefulBastard In return]], Belial [[ICanRuleAlone kills the Zarab]] and then heads to the Land of Light, successfully stealing the Plasma Spark and freezing everyone on the planet in an AndIMustScream state. Belial then plans to take his army of 100 {{kaiju}} and use them to conquer the galaxy. When confronted by the few survivors of his earlier campaign, Belial sics his monsters on them, at one point mind-controlling Rei and Gomora and turning them against Series/UltraSeven. Belial then finishes the job, seemingly killing Seven. When cornered, Belial forcibly merges with all of his monsters into a BodyHorror [[OneWingedAngel super monster]] named Beryudora, literally made from their bodies, causing all of them intense agony.

->'''[[Characters/UltraSeriesUltramanBelial Ultraman Belial]]:''' I am Ultraman Belial Atrocious. I was the one who nearly destroyed this universe.\\

* [[Characters/UltraSeriesUltramanBelial Ultraman Belial]] is the BigBad of the entire ''Franchise/UltramanZero'' franchise:
** ''Film/MegaMonsterBattleUltraGalaxyLegends'': [[GalacticConqueror Ultraman Belial]] ("Super Galaxy Great Emperor") is a FallenHero-turned-tyrant and a Satanic Archetype. Ultraman Belial started off as a typical Ultraman warrior , but, due to {{greed}}, desired to steal the Plasma Spark powering their entire civilization; this would cause the planet to immediately freeze over, trapping all the Ultras in ice for an eternity. Belial was found out, and [[TheExile sent into exile]]...before coming back, having merged with the ancient [[EldritchAbomination Alien Rayblood]]. He went on a wild rampage before being [[SealedEvilInACan sealed away]] by Ultraman King. Unfortunately, thousands of years later an Alien Zarab sets Belial free in an attempt to form an alliance with him. [[UngratefulBastard In return]], Belial [[ICanRuleAlone kills the Zarab]] and then heads to the Land of Light, successfully stealing the Plasma Spark and freezing everyone on the planet in an AndIMustScream state. Belial then plans to take his army of 100 {{kaiju}} and use them to conquer the galaxy. When confronted by the few survivors of his earlier campaign, Belial sics his monsters on them, at one point mind-controlling Rei and Gomora and turning them against Series/UltraSeven. Belial then finishes the job, seemingly killing Seven. When cornered, Belial forcibly merges with all of his monsters into a BodyHorror [[OneWingedAngel super monster]] named Beryudora, literally made from their bodies, causing all of them intense agony.

** ''[[Film/UltramanGingaSTheMovieShowdownThe10UltraBrothers The Movie: Showdown! The 10 Ultra Warriors!]]'': [[TheCollector Etelgar]] ("Super Space-time Demon") intends to [[MultiversalConqueror conquer entire universes]], firstly by abducting the Ultramen protectors of each universe and having them [[AndIMustScream trapped in suspended animation, still aware of their surroundings but completely immobile]]. Invading the peaceful Planet Zandt causing untold amounts of destruction, Etelgar had the princess of Zandt, Arina, captured and put through brainwashing turning her into his lackey; implanting FalseMemories in her mind to trick her into believing that her home planet was destroyed by the Ultras; and subjecting her to regular MindRape to enforce her loyalty. Intending to invade the universe of Ultraman Ginga and Victory, Etelgar nearly managed to have Ginga and Victory sealed alive in his collection, and later recreates a mountain-sized copy of the previous villain Dark Lugiel to destroy the city for his own sadistic pleasure.

* [[Manga/{{Ultraman}} Netflix anime]]: Season 1:

[[caption-width-right:350:[[Recap/UltramanEp39FarewellUltraman "Have you become so fond of humans]], [[ToServeMan Alien Adacic?"]]]]

* [[Manga/{{Ultraman}} Netflix anime]]:
** Season 1:
*** [[AxCrazy Alien Adacic]] is the [[StarterVillain first true villain]] Ultraman, Shinjiro Hayata, had to face. A sadistic alien SerialKiller, Adacic [[EstablishingCharacterMoment introduces himself]] draining the blood of his latest victim while leaving a trail of corpses is left in his wake. Encountering Ultraman, Adacic lures him into the city, forcing Shinjiro to fight him the middle of a crowded street, endangering countless civilians in the process before deciding to kill everyone out of anger for being wounded. [[ResurrectedMurderer Brought back to life]], Adacic resumes his killing spree to lure the Ultramen to his location for him to kill.
*** [[PsychoForHire Ace Killer]] is a sociopathic mercenary hired to cause the airline explosion that Bemular was [[FrameUp framed for]], resulting in the deaths of almost everyone on board, [[WouldHurtAChild children included]]. When Moroboshi, Shinjiro, and Seiji track him down, Ace Killer kills Moroboshi's entire squad before [[ColdBloodedTorture torturing]] Shinjiro and Seiji with intent to kill, while gloating he'll mount his skull in his trophy room before going after Seiji's childhood friend next. Upon dying, Ace Killer tries destroying the entire area with a massive bomb [[TakingYouWithMe in one final act of spite]].
** Season 2: [[GalacticConqueror Alien Pedan(t)]] is the leader of the Blackstars who arrives on Earth demanding that the planet hand over half of its entire populace to him, manipulating Maya and her DyingRace into transporting countless humans to a void under his watch to serve as hostages for Pedant. Pedant also intends to capture the six Ultramen, having already captured one, Shinjiro Hayata, before entering the SSSP and slaughtering everyone he sees before brutalizing Shinjiro's father. When Maya refuses to detonate the transmission device to subdue the 3 Ultramen, Pedant detonates it himself, killing Maya's friends before ordering Maya and her race to be exterminated once they [[YouHaveOutlivedYourUsefulness served their purpose]]. Growing impatient with humanity's decision, Pedant launches a [[AlienInvasion full-scale invasion]] to personally wipe out half of the world's population, killing millions before the Ultramen arrive. Sadistically torturing the Ultramen until they manage to gain the strength to kill him, Pedant reveals that he intends to die by their hands to activate a [[ThanatosGambit plan]], which Bemular describes as "the end of all things".

** [[TheManBehindTheMan Alien Empera]], aka [[DarkIsEvil the Lord of Darkness]] and TheEmperor, is the GreaterScopeVillain of the entire Showa continuity. Empera is [[Series/UltramanTaro first mentioned]] as being the reason two planets went into a ForeverWar, and later is shown on screen as the driving force of evil in the Showa era ''Ultra'' shows. In the stage shows, he attempted to wipe out everyone in his timeline through a time travel plot, one that [[Franchise/UltramanZero later inspired Ultraman Belial]] to try his own evil plans. In ''Ultraman Mebius'' proper, finally appearing physically in the final episodes, Empera is the reason that the monsters and aliens have been invading for the past year. He called Bogal to Earth, and after her death he continued guiding more monsters to Earth to continue softening up the defense forces for his own arrival. His own loyal generals are thrown aside and discarded like trash after [[YouHaveOutlivedYourUsefulness they expend their own usefulness]]. In the final battle, Empera kills two of the heroes, Zamushar and Ultraman Hikari’s original host, and almost kills Mebius and Hikari for good. His final plan was to blot out the sun, wiping out all of humanity, just to spite his old enemy Ultra Father. Hateful, cruel and arrogant, Empera proves that sometimes AliensAreBastards.

** ''Film/MegaMonsterBattleUltraGalaxyLegends'': [[GalacticConqueror Ultraman Belial]] ("Super Galaxy Great Emperor") is a FallenHero-turned-tyrant and a Satanic Archetype. Ultraman Belial started off as a typical Ultraman warrior , but, due to {{greed}}, desired to steal the Plasma Spark powering their entire civilization; this would cause the planet to immediately freeze over, trapping all the Ultras in ice for an eternity. Belial was found out, and [[TheExile sent into exile]]…before coming back, having merged with the ancient [[EldritchAbomination Alien Rayblood]]. He went on a wild rampage before being [[SealedEvilInACan sealed away]] by Ultraman King. Unfortunately, thousands of years later an Alien Zarab sets Belial free in an attempt to form an alliance with him. [[UngratefulBastard In return]], Belial [[ICanRuleAlone kills the Zarab]] and then heads to the Land of Light, successfully stealing the Plasma Spark and freezing everyone on the planet in an AndIMustScream state. Belial then plans to take his army of 100 {{kaiju}} and use them to conquer the galaxy. When confronted by the few survivors of his earlier campaign, Belial sics his monsters on them, at one point mind-controlling Rei and Gomora and turning them against Series/UltraSeven. Belial then finishes the job, seemingly killing Seven. When cornered, Belial forcibly merges with all of his monsters into a BodyHorror [[OneWingedAngel super monster]] named Beryudora, literally made from their bodies, causing all of them intense agony.
** ''[[Film/UltramanZeroTheRevengeOfBelial The Revenge of Belial]]'': Belial comes back as [[MultiversalConqueror Kaiser Belial]] ("Dark Great Emperor"), as bad as ever. After Zero beat Belial, Belial traveled to another dimension, creating Darklops robotic clones of his archenemy Zero and sending them out to cause havoc. One such clone, Darklops Zero, is the BigBad of the tie-in movie ''Film/UltraGalaxyLegendGaidenUltramanZeroVsDarklopsZero'', making Belial [[GreaterScopeVillain responsible for everything that goes wrong there]]. Said clone was a sadistic killing machine, much like his creator. In the movie proper, we find out why Belial was making an army of robots—he’s been going from planet to planet in this new dimension, harvesting "emerald" power sources to power his army and himself. Renaming himself "Kaiser Belial" or simply "Emperor", Belial sends his forces to massacre all opposition. Zero tracks Belial to this dimension, even taking a human host to survive, but Belial captures him and gloats to Zero about his plans. Once finished in this alternate dimension, Belial was going to murder all Zero’s friends and then have his Empire destroy everyone in Nebula M78, Zero’s home world, while Zero is forced to watch. Zero escapes and the two have a rematch, with Belial eventually turning into a monster called [[OneWingedAngel Arch Belial]]. Now unstoppable, Belial takes great pleasure in [[ColdBloodedTorture torturing Zero]], beating on him and sucking the life out of Zero’s body while gloating about his newfound power.

** ''[[Series/UltramanGeed Geed]]'': [[TheManBehindTheMan Ultraman Belial]] has somehow gotten worse. The first thing he does in this series, during his fourth attack on the Land of Light, is defeat all the Ultramen before setting off a bomb that would [[OmnicidalManiac wipe out all life in their universe]]. However this was a XanatosGambit: either Belial kills them all and gets his revenge, or he gets Ultraman King out of the picture. The latter happens, and Belial then hides out in space, plotting his next move. Belial plans on making himself invincible by eating Geed alive and leeching power from him like a battery. When that fails due to Geed's strong willpower, he chooses to [[ArchnemesisDad mind control his son]] into becoming a loyal slave. Geed escapes and Belial loses their fight, only to come back by possessing an innocent woman and using her as a puppet while manipulating his own loyal servant [[TheHeavy Fukuide Kei]] into fighting for him. Upon finding that [[YouHaveOutlivedYourUsefulness Kei is of no further use to him]], Belial rips out Kei's Sturm Organ—his power source and vital organ—and eats it in front of him, cackling about how Kei will be dead in days without it. During the final battle, Geed attempts to reason with his father, all but begging him to let go of his evil. Belial [[RedemptionRejection responds]] by trying to kill him one last time, demonstrating he is [[PutThemAllOutOfMyMisery beyond all help]].

*** "On Halloween Night": [[ChildEater Giranbo]] ("Different Dimension People") is an [[WickedWitch evil extradimensional witch]] who believes dreams are wasted on the young. Arriving in our dimension every Halloween for as far back as GUTS's records can remember, she hands out tainted candy to a town's children which allow her to brainwash and abduct them. Once ferried off to her dimension, Giranbo [[DreamEater devours their dreams]] until they're an {{empty shell}}s, and then callously throws what remains away in her Dream Graveyard. When Daigo discovers her, she traps him and forces him to watch her devour a young boy's dreams. Finding the dreams of adults unappetizing, Giranbo instead opts to leave the hero to a slow death by suffocation while she welcomes her latest feast to her dimension. When Tiga foils her plans, Giranbo attempts to kill the hero, gleefully laughing as she and her clones gang up and beat him down. While a mere MonsterOfTheWeek, Giranbo condemned countless children to a horrible fate over her very long life who even her demise doesn't bring back.

** [[OmnicidalManiac Dark Lugiel]] ("Darkness Demon") is Ginga's EvilCounterpart and dark side. They split because Ginga wanted life to change and evolve naturally, while Lugiel wanted life to remain in stasis, which meant killing and petrifying everyone in existence. To do so, Lugiel started a tremendous war between the heroes and villains of the Ultra Series, with himself leading the charge on the villainous side—only to turn on them and use his Dark Spark to turn everyone on both sides into Spark Dolls. Ultraman Taro was still able to speak, but everyone else was [[AndIMustScream trapped as an immobile tiny statue]] until Lugiel decided to use their powers for something. Thanks to Ginga, Lugiel lost his own body, so he takes over a woman in Japan and uses his trapped minions to [[WouldHurtAChild torment the students]] all over an elementary school. Lugiel had no restraints about [[YouHaveOutlivedYourUsefulness throwing them aside when necessary]]—he kills Alien Icarus, reverting his body to a Spark Doll after [[YouHaveFailedMe Icarus fails]] and surrenders to the heroes. After Lugiel finally gains enough power to strike directly, he {{mind rape}}s dozens of people, inflicting them with such despair that they pass out, while Lugiel [[EmotionEater feeds on this to restore his own powers]]. When Ginga attempts to stop him, Lugiel goes for a sucker punch and then tortures a half-powered Ginga until he too loses consciousness. Lugiel is beaten, but comes back in the sequel as Dark Lugiel, returning after his body was restored by Alien Chibu Exceller, and used as a weapon against Ginga and Victory. Lugiel then takes his body back, kills Exceller via a shot to the back, and takes over his new enhanced Vict Lugiel form and preparing to use his powers to turn all of humanity into Spark Dolls. He gleefully [[EvilGloating gloats]] that he'd create the ultimate paradise...but it'd only be perfect for himself.

** [[Creator/HarveyComics Nemesis]] sequel:

* ''[[Series/UltramanTowardsTheFuture Towards the Future]]'': [[StarterVillainStays Gudis]] ("[[TheCorruption Evil Life Form]]") is the primary villain of the first six episodes. Gudis is a [[ParasitesAreEvil parasitic monster]] responsible for destroying many worlds, [[TheAssimilator absorbing]] all the life from those planets into its being. On Mars, Gudis kills Stanley Haggard and nearly kills hero Jack Shindo. Thought destroyed by Ultraman Great, Gudis's cells land on the Earth, mutating various innocent life forms and turning them into monsters, leading to their deaths and the deaths of the monsters' rampages. One of Gudis's plans involved brainwashing a little kid and his newly mutated lizard to be used as weapons for its invasion. Taking control of the body of Stanley Haggard, Gudis infiltrates the UMA base, killing many crewmembers and kidnapping and infecting Jean Echo with its cells. In its final episode, inside a volcano, Gudis attempts to deplete the oxygen of the entire Earth, which would make the planet unlivable. When the military comes in to try to stop Gudis, it mercilessly kills most of them. When Gudis captures Ultraman Great inside its body, Gudis starts to physically and mentally torture him.

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[[quoteright:350:[[Series/UltramanLeo https://static.tvtropes.org/pmwiki/pub/images/screenshot_2023_03_14_153527.png]]]]%%

-->— ''[[Series/UltramanGeed Geed]]'', "[[Recap/UltramanGeedEp24TheFragmentsOfHope The Fragments of Hope]]"

The ''Franchise/UltraSeries'' is a [[LongRunners long-running]] {{Toku}} series and the UrExample of the HenshinHero. Not surprisingly, there are dozens—if not hundreds—of {{Kaiju}} and other enemies. [[CompleteMonster Here are the worst.]]

%% NOTE: Due to the controversial nature of this trope, any changes (additions, removals, edits) should be discussed here or here.

** TV series:

** {{Manhua}} adaptation, by Tony Wong & Khoo Fuk Lung:

*** [[SociopathicSoldier Two unnamed Alien Regulans]] are the deadliest warriors of a dying kingdom that seeks to establish a new empire by "cleansing" Earth in death and chaos. Given the mission of preparing their army for the invasion, the Regulans painfully convert the fishermen of a coastal village into SlaveMooks and order them to lay siege to on the Citagon, slaughtering several GUTS employees. Once Ultraman Tiga arrives to stop them, they try to [[PsychicAssistedSuicide make their brainwashed victims drown themselves in the sea]]. After Ultraman Tiga leaves them stranded on Earth, the Regulans begin massacring the innocent civilians of Shizuoka out of sheer spite, [[ManOnFire burning over 48 people alive]]. When one of them is finally killed, the surviving Alien Regulan [[DirtyCoward cowardly]] allies himself with Makila to escape punishment.

* ''[[https://ultra.fandom.com/wiki/Ultraman_Fighting_Evolution_Rebirth Fighting Evolution Rebirth]]'': [[Recap/UltramanEp33TheForbiddenWords Alien Mephilas]] ("[[AliensAreBastards Malicious Alien]]") is an evil alien invader and the [[BigBad true mastermind]] of the story. Forcing the redeemed Chaos Header back into its corrupted form, he makes it corrupt monsters and unleashes multiple monster attacks to gather data. He then unleashes the [[PsychoRangers Chaosroids]] on the Land of Light, nearly sending its orbit spiraling out of control by having S steal the Ultra Key, nearly lets it freeze in the cold by having U destroy the Plasma Spark, and has T steal the Ultra Bell and destroy a portion of the city. Possessing Chaos Darkness, Mephilas brutalizes Ultraman Agul, Gaia, and Tiga before forcing the entity to try and kill its now ally Cosmos. When Cosmos tries to free Chaos Header, Mephilas fully merges with it and dissolves a portion of the city. Upon defeat, Mephilas sees the whole situation as little more than a sick game.

* ''Series/UltramanEighty'''s "Shine into Eternity!! Space G-Men 85": [[SnakesAreSinister Gamos]] ([[OmnicidalManiac "Cruel Monster"]]) is a CivilizationDestroyer responsible for wiping out all life on multiple planets, rendering entire alien civilizations completely extinct and turning every world it has invaded into a GhostPlanet. Twenty years prior, Gamos invaded the home planet of the alien warrior Zuckal, destroying the entire city Zuckal resides in. When Zuckal tried defending his family, Gamos easily defeated Zuckal, and to "punish" Zuckal for showing resistance, the horrible creature then killed Zuckal's wife and son using its acid breath while [[CruelMercy deliberately sparing the now-defenseless Zuckal]], resulting in Zuckal spending the next two decades trying to hunt down Gamos. Early in the episode, Gamos invades Earth, its next target, and rampages across Tokyo, using acid breath on several innocent civilians in a park and clearly enjoying every moment of its rampage.

** ''[[Film/UltramanZeroTheRevengeOfBelial The Revenge of Belial]]'': Belial comes back as [[MultiversalConqueror Kaiser Belial]] ("Dark Great Emperor"), as bad as ever. After Zero beat Belial, Belial traveled to another dimension, creating Darklops robotic clones of his archenemy Zero and sending them out to cause havoc. One such clone, Darklops Zero, is the BigBad of the tie-in movie ''Ultra Galaxy: Ultraman Zero vs Darklops Zero'', making Belial [[GreaterScopeVillain responsible for everything that goes wrong there]]. Said clone was a sadistic killing machine, much like his creator. In the movie proper, we find out why Belial was making an army of robots--he’s been going from planet to planet in this new dimension, harvesting "emerald" power sources to power his army and himself. Renaming himself "Kaiser Belial" or simply "Emperor", Belial sends his forces to massacre all opposition. Zero tracks Belial to this dimension, even taking a human host to survive, but Belial captures him and gloats to Zero about his plans. Once finished in this alternate dimension, Belial was going to murder all Zero’s friends and then have his Empire destroy everyone in Nebula M78, Zero’s home world, while Zero is forced to watch. Zero escapes and the two have a rematch, with Belial eventually turning into a monster called [[OneWingedAngel Arch Belial]]. Now unstoppable, Belial takes great pleasure in [[ColdBloodedTorture torturing Zero]], beating on him and sucking the life out of Zero’s body while gloating about his newfound power.
** ''Ultra Zero Fight'': Ultraman Belial comes back as a ghost in this series, with [[ItsPersonal much more personal]] plans in mind for Zero. This time, Belial decides to take his revenge on Zero by [[DemonicPossession possessing Zero's body]], locking Zero away inside, and [[ForcedToWatch forcing Zero to watch]] as Belial murders all of Zero's friends. Belial takes sadistic pleasure in beating all of Ultimate Force Zero to death while Zero is helpless. Afterwards, Belial plans to use Zero's power and his own to conquer the universe.

** [[BigBad Gatanozoa]] ("[[GodOfEvil Evil God]]") is the {{ancient|Evil}} and vile [[DarkIsEvil Master of Darkness]]. Gatanozoa sought to plunge the world into darkness, despair, and desolation. Using its herald Gijera to pave the way, Gatanozoa and his Zoiger army would [[CivilizationDestroyer wipe ancient humanity and their civilization from the face of the Earth]] before ending their age of darkness by returning to slumber in R'lyeh until life repopulated. In the modern day, Gatanozoa would stir from his hibernation, once more attempting to have Gijera addict humanity to its flowers until they began to destroy themselves and become easy prey. While Gijera would fail, Gatanozoa would unleash his Zoiger to ravage the world, reducing its major cities to blazing ruin and decimating GUTS while the monster would slaughter the Japanese branch's crew with his darkness. Confronted by Tiga, Gatanozoa would draw the battle out, strangling and pummeling the hero until finally turning him to stone, casting him into the depths of the sea with Daigo still conscious and aware inside. Even in death, Gatanozoa's hatred and rage would later allow the Dark Giant Kamila to transform into Demonzoa and attempt to destroy his killer.
** "On Halloween Night": [[ChildEater Giranbo]] ("Different Dimension People") is an [[WickedWitch evil extradimensional witch]] who believes dreams are wasted on the young. Arriving in our dimension every Halloween for as far back as GUTS's records can remember, she hands out tainted candy to a town's children which allow her to brainwash and abduct them. Once ferried off to her dimension, Giranbo [[DreamEater devours their dreams]] until they're an {{empty shell}}s, and then callously throws what remains away in her Dream Graveyard. When Daigo discovers her, she traps him and forces him to watch her devour a young boy's dreams. Finding the dreams of adults unappetizing, Giranbo instead opts to leave the hero to a slow death by suffocation while she welcomes her latest feast to her dimension. When Tiga foils her plans, Giranbo attempts to kill the hero, gleefully laughing as she and her clones gang up and beat him down. While a mere MonsterOfTheWeek, Giranbo condemned countless children to a horrible fate over her very long life who even her demise doesn't bring back.
** {{Manhua}} adaptation:

** ''Once Again Gaia'': [[BigBad Gakuzom]] ("Root of Destruction Sea God") is Zogu's [[TheBrute brutish]] fellow Root of Destruction. Surviving Zogu's defeat and his master's retreat, [[DragonAscendant Gakuzom would begin his own onslaught]] on Earth several years later. Attacking the peaceful and defenseless Rinar 8,000 feet below, Gakuzom would viciously assault the GUARD sub sent to answer their SOS. Finally making his move and plunging the Pacific into a perpetual storm, Gakuzom attempts to [[OmnicidalManiac wipe out all life on Earth]] with his Baiakuhe, with the Root of Destruction attacking Tokyo personally. When Agul arrives to stop him, Gakuzom has his minions maul and restrain the hero while he beats him down himself. When Gaia arrives, Gakuzom [[BadBoss devours his entire army]] and begins brutally pounding the two heroes.

** ''TheMovie: Here Comes! Our Ultraman'': [[BigBad Zaigorg]] ("[[MeaningfulName Devil Beast/Enma Beast/Ruler of Hell Beast]]"; literally "[[NamesToRunAwayFromReallyFast Sin Suffering]]") is an [[AncientEvil ancient demon]] and the Satan equal of the X Universe. Emerging from Hell in ancient times, Zaigorg would bring about HellOnEarth until finally defeated and [[SealedEvilInACan sealed away]]. Upon his release in modern times, Zaigorg instantly attacks the nearest group of humans in sight, including the child Yuuto, and slowly approaches a helpless woman to crush her to death. When X tries to stop him, Zaigorg beats him down and obliterates the entire area with the finishing blow while sealing Daichi's ability to become X so he can watch the rest of his rampage helpless to stop him. Arriving in the city, Zaigorg would rampage alongside clones of Antlar and Fire Golza, ending with trying to slowly collapse a building underneath the feet of the civilians trapped inside. Getting the drop on Ultraman and Tiga, Zaigorg would attempt to suck the life out of them and use their stolen energy unleash clones of Tsurugi Demaaga on five major cities around the globe with the intent to once more turn them into Hell. Zaigorg is [[SatanicArchetype the devil himself]], and his only motivation for any of his crimes is his own {{sadist}}ic pleasure.

[[folder:World of the Land of Light/(Nebula) [=M78=] universe]]

[[folder:Neo Frontier Universe]]

[[folder:Heisei Universes]]

[[folder:Next Generation Universes]]

[[folder:Others]]

*** [[StarterVillain Alien Adacic]] is an alien SerialKiller Shinjiro is sent to terminate. Adacic is [[EstablishingCharacterMoment introduced]] in a room full of corpses he's drained of blood while [[AxCrazy gleefully]] finishing off the latest of many such massacres he's committed. Leading the fight into the city, Adacic intentionally stops the chase and fights Shinjiro in the middle of a crowded street. When the teenager Rena tries to encourage Shinjiro, Adacic tries to murder her out of boredom and soon begins blowing up the area and endangering countless civilians in the process. When his arm is sliced off, Adacic goes berserk and decides he'll eat every civilian in the area out of spite. Despite being the first MonsterOfTheWeek, Adacic proves one of the worst and most sadistic in the entire series.
*** [[SoftSpokenSadist Ace Killer]] is the leader of Ace Killer Squad. A [[PsychoForHire sociopathic mercenary]], he's the true perpetrator of the airline explosion that kick-started the series, killing most of those on board, children included, an act which for him [[ButForMeItWasTuesday was simply an average day on the job]]. When Moroboshi and Shinjiro track him down, Ace Killer's trap kills Moroboshi's entire squad, something which the mercenary couldn't care less about. Despite not being part of his current job, Ace Killer decides to kill the two anyway [[ForTheEvulz for his own amusement]], and tortures both Shinjiro and Seiji, assuring the latter his childhood friend Yuko is next on his list. After being temporarily killed by Seiji, Ace Killer decides to brutalize the already mortally wounded boy and mount his skull in his trophy room. Even in death, Ace Killer tries to destroy the entire area with a massive bomb in [[TakingYouWithMe one final act of spite]]. Despite being a hired soldier, Ace Killer enjoys every second of it and cares for nothing else, not even his own squad.
** Season 2: [[GalacticConqueror Alien Pedan(t)]] is the leader of the Blackstars who arrives on Earth demanding that the planet hand over half of its entire populace to him, manipulating Maya and her DyingRace into transporting countless humans to a void under his watch to serve as hostages for Pedant. Pedant also intends to capture the six Ultraman, having already captured one, Shinjiro Hayata, before entering the SSSP and slaughtering everyone he sees before brutalizing Shinjiro's father. When Maya refuses to detonate the transmission device to subdue the 3 Ultramen, Pedant detonates it himself, killing Maya's friends before having Maya killed and her race exterminated after they [[YouHaveOutlivedYourUsefulness served their purpose]]. Growing impatient with humanity's decision, Pedant launches a [[AlienInvasion full-scale invasion]] to personally wipe out half of the world's population, killing millions before the Ultramen arrive. Sadistically torturing the Ultramen until they manage to gain the strength to kill him, Pedant reveals that he intends to die by their hands to activate a [[ThanatosGambit plan]] which Bemular describes as "the end of all things".

** "Being Ultraman Isn't Bad" & "Release the Limiter!": [[StarterVillain Alien Adacic]] is an alien SerialKiller Shinjiro is sent to terminate. Adacic is [[EstablishingCharacterMoment introduced]] in a room full of corpses he's drained of blood while [[AxCrazy gleefully]] finishing off the latest of many such massacres he's committed. Leading the fight into the city, Adacic intentionally stops the chase and fights Shinjiro in the middle of a crowded street. When the teenager Rena tries to encourage Shinjiro, Adacic tries to murder her out of boredom and soon begins blowing up the area and endangering countless civilians in the process. When his arm is sliced off, Adacic goes berserk and decides he'll eat every civilian in the area out of spite. Despite being the first MonsterOfTheWeek, Adacic proves one of the worst and most sadistic in the entire series.
** "You As You Are" through "A Real Ultraman": [[SoftSpokenSadist Ace Killer]] is the leader of Ace Killer Squad. A [[PsychoForHire sociopathic mercenary]], he's the true perpetrator of the airline explosion that kick-started the series, killing most of those on board, children included, an act which for him [[ButForMeItWasTuesday was simply an average day on the job]]. When Moroboshi and Shinjiro track him down, Ace Killer's trap kills Moroboshi's entire squad, something which the mercenary couldn't care less about. Despite not being part of his current job, Ace Killer decides to kill the two anyway [[ForTheEvulz for his own amusement]], and tortures both Shinjiro and Seiji, assuring the latter his childhood friend Yuko is next on his list. After being temporarily killed by Seiji, Ace Killer decides to brutalize the already mortally wounded boy and mount his skull in his trophy room. Even in death, Ace Killer tries to destroy the entire area with a massive bomb in [[TakingYouWithMe one final act of spite]]. Despite being a hired soldier, Ace Killer enjoys every second of it and cares for nothing else, not even his own squad.