History Characters / ReturnOfUltraman

* ReducedToDust: [[spoiler:Once Draculas is killed, his body turns to ashes that are then blown away by the wind to reveal Midori's corpse underneath.

* ThisWasItsTrueForm: In a slight variation, she only assumes her true form just before performing her HeroicSacrifice, with her otherwise appearing in her human disguise throughout the whole episode.

* TechnicolorFire: Due to the phosphorescent properties of its EyeBeams, Granadas creates lots of blue fire when it causes destruction.

* TheWorfEffect: So strong, so tough, and so powerful that Jack was unable to beat him at all the first time (though it also had a lot to do with how depressed Goh was about [[spoiler:the death of Ken and Aki]]).

* WhipItGood / CombatTentacles: Its weapon of choice. They're powerful enough that a single whiplash can smash through solid stone.

* WhipItGood: The tubes on Leogon's back carry vines to use as whips or to wrap around enemies.

* TailSlap / PrehensileTail: Obviously Twin Tail's main weapons. They're also capable of throttling Ultras if necessary.

* WhipItGood: The two tails. They also have nasty little spikes for extra effect.

* PteroSoarer: Although its actually based on ''Archaeopteryx'', but you have to remember that kaiju are never supposed to be realistic.

!!Hideki Goh
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/hideki_goh.jpg]]

-->'''Played by:''' Jiro Dan
The series protagonist and human host of Ultraman Jack. Goh was originally a race car driver, but joined MAT after the events of the first episode. Unlike other human hosts, Goh transforms through an act of willpower. He has also gained enhanced senses as a result of his merging with Jack.

* BadassDriver: An up and coming racecar driver, his personal skills have helped with driving a MAT vehicle.
* BigBrotherInstinct: Towards Jiro.
* BlessedWithSuck: He's got superhuman abilities even as a human, but his loved ones can and do become targets for his enemies. Also, any injuries Jack suffers extend to Goh as well. In the beginning, Goh has no control as to when he transforms, which puts his life in constant danger, too.
* ButNowIMustGo: In the finale, [[spoiler: he chooses to leave earth and go to nebula M78, since he now considers being an ultra is a part of him. He then bids Jiro and Rumiko farewell, before leaving.]]
* TheEveryman: Compared to the previous two Ultras we learn a lot more about his personal life and ambitions. Hayata was the first host and none of his personal life was shown. While Dan was very much Ultraseven himself with simply a human guise.
* FakingTheDead: He allows himself to be engulfed in Arrow-1's explosion in the final episode, turning into Ultraman Jack in the inferno while having MAT presume he's dead. After destroying Alien Bat and Zetton II, Goh reveals himself to Jiro and Aki.
* FirstEpisodeResurrection: Like Hayata before him, Goh was revived after getting crushed by Takkong and used as Ultraman Jack's host, scaring the bejesus out of a random nurse in the process.
* GoodLookingPrivates: Both Goh and Kishida
* TheHero: As the main character.
* LeeroyJenkins: Has his moments, the worst in Episode 2, where he gets cocky due to his newfound powers extending to his human form, resulting in a suspension and an injured Minami. He got better.
* SitcomArchNemesis: Kishida is this to him, due to how much and how often they fight.

!!Captain Katsuhiro Kato

-->'''Played by:''' Nobuo Tsukamoto
The captain of MAT, who cares a lot about his small team and is willing to disregard orders if the circumstances warrant it. He leaves the team after Episode 22 and is replaced with Captain Ibuki.

* CoolOldGuy: Very congenial to everybody
* AFatherToHisMen: Paternal, too
* FrontlineGeneral: When he orders his troops to attack, he's dodging kaijuus along with them
* PutOnABus: Leaves MAT in Episode 22.

!!Takeshi Minami

-->'''Played by:''' Shunsuke Ikeda
The second-in-command at MAT, Minami looks over his fellow officers, especially Goh.

!!Ippei Ueno

-->'''Played by:''' Hatashi Mitsushi
An MAT officer who is a lot more easygoing than Minami, but can also be superstitious at times.

!!Fumio Kishida

-->'''Played by:''' Ken Nishida
Born into an old military family, Kishida has connections with MAT's higher-ups, which is quite useful when MAT is butting heads with them.

* EarlyInstallmentWeirdness: In the early episodes, Kishida was a total hot head who would get mad at Goh just for questioning him. It was more noticeable in the two-part episodes Two Big Monsters Attack Tokyo and Battle! Monsters vs MAT. Thankfully this trait fades after a while by making him strict but reasonable who isn’t afraid to hide his smile from time to time.
* GoodLookingPrivates: He and Goh are easily the best looking of the bunch.
* HotBlooded: Seems to be in a bad mood all the time, and locks horns with Goh from time to time. This attitude drops after a while.
* JerkWithAHeartOfGold: He may be pretty strict, but he does care about the well being of others.
* ScrewTheRulesIHaveConnections: Resorts to use his family connections to get his way, even opposing the captain one time.
* SitcomArchNemesis: This is a (mostly) dramatic series, but he comes close to fulfilling this trope due to his antagonistic rapport with Goh. This is averted or downplayed sometime after Episode 20.

!!Yuriko Oka

-->'''Played by:''' Mika Katsuragi
MAT's sole female member and its communications officer. That's not to say she isn't capable in combat though.

* ActionGirl: When her teammates are possessed by Alien Nackle, she fought them off once by herself, and once along with Goh.
* BridgeBunnies: Her usual role
* MsFanservice: In one episode, due to her wearing a miniskirt.
* TheSmurfettePrinciple: Token female

!!Captain Ryu Ibuki

-->'''Played by:''' Jun Negami
Captain Kato's replacement from Episode 23 onwards. He is much sterner in comparison to his predecessor.

* AFatherToHisMen: While he's sterner than Kato was and does not hold anything back when calling out MAT for any insurbodination, he is fair and looks after the well being of everyone. Goh even said that he sees him as a father in episode 33.
* BigDamnHeroes: As often and as well as the whole team did this, Ibuki had three awesome moments by himself, namely: in Episode 31, against Alien Zelan; in the last episode, when he pulled a ''knife'' against Alien Bat; and in his debut episode, when he kept Gokinezula at bay while airborne. Notice that in two of these occassions, he saved Ultraman Jack all by himself.
* EstablishingCharacterMoment: In his debut, he quickly suspends Goh, who attacks the monster without any plan or strategy, flies into action immediately, and shares a laugh with everyone t the end of the episode. He's a tough but also a fair and decent guy at heart.
* HiddenDepths: He's a loving family man. He has his moments of levity, too.
* SecretSecretKeeper: [[spoiler:It's implied throughout the series that he knows Goh is Ultraman Jack.]]
** most notably in episode 33, where during Mururchi's attack [[spoiler: he disguised himself as a monk, to ''specifically'' convince Goh to save the town and stop Muruchi's rampage, without having other MAT members intervene]].
* TyrantTakesTheHelm: Looks that way initially, but he's a subversion. He's rather tough but fair.

!Others
!!Ken Sakata
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/ken_sakata.png]]

-->'''Played by:''' Shin Kishida
The owner of a car repair shop and the oldest of the Sakata siblings who Goh lives with. He is Goh's best friend off the defense team.

* CarFu: [[spoiler:He's ran over by a car courtesy of Alien Nackle.]]
* CheatedDeathDiedAnyway: Survived the car racing accident that crippled him, only to [[spoiler:be run over by Alien Knackle and his men]].
* GeniusCripple: He owns and operates the car shop where both Goh (occasionally) and Aki work. It seems like he does the bookkeeping, too. Both he and Goh built the "Shooting Star" racecar from the first episode. He made aerodynamic improvements to Goh's MAT car and was willing to work on applying the same to MAT planes as well.
* KilledOffForReal: Alien Nackle and his mooks kidnapped Aki, ran Ken over after she cried for help, gave Aki a scare, and killed her.
* ReallyDeadMontage: In "When the Ultra Star Shines"
* StealthMentor: He calls out and reprimands Goh often, but he deep down just wants Goh to succeed.

!!Aki Sakata
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/aki_sakata.png]]

-->'''Played by:''' Rumi Sakakibara
Ken's younger sister and Goh's love interest. She manages the housework and takes care of Jiro while Ken is at work.

* CheatedDeathDiedAnyway: Survived Gudon and Twin Tail's rampage, only to [[spoiler:be assassinated by Alien Knackle and his men]]
* DamselInDistress: Doesn't happen often, but when it happens, it's dark and impactful.
* GreenEyedMonster: Gets a bit jealous if Goh talks to other girls. In Episode 4, she became uncomfortable when Goh was talking shop with Oka in front of her.
* KilledOffForReal: She never comes back from the dead after Nackle kills her.
* MsFanservice: The leggy variety. Also very pretty.
* NiceGirl: She has her moments, but overall she's kind and cheerful.
* OfficialCouple: With Goh throughout the franchise, though they only take their relationship further in alternate universes due to her death in the Showa timeline.
* ReallyDeadMontage: In "When the Ultra Star Shines"
* WhatADrag: How she was killed.

!!Jiro Sakata
[[quoteright:280:https://static.tvtropes.org/pmwiki/pub/images/jiro_sakata.jpg]]

-->'''Played by:''' Hideki Kawaguchi
The youngest of the Sakata siblings and a friend of Goh. 11-year-old Jiro is obsessed with Ultraman and monsters and enjoys playing around with cameras to make home movies.

* AnnoyingYoungerSibling: To Ken and Aki.
* EstablishingCharacterMoment: When Takkong and Zazahn attacked, he came running into Ken's car shop yelling "Monsters, monsters!", grabbed an enormous wrench and ran toward them, much to the chagrin of Goh, who followed him.
* LeeroyJenkins: He will get in all sorts of trouble so he can prove there's a monster that needs to be fought.
* TagalongKid: To Goh.
* UnwittingInstigatorOfDoom: Goh put his life on the line in the first episode because Jiro ran out of Ken's car shop wielding a wrench to fight the rampaging kaijuus. Likewise, one of the monsters from Episodes 5 and 6 came out of an egg Jiro found. Aki got caught up in the ensuing destruction. In Episode 29, Jiro got trapped in the space capsule the MonsterOfTheWeek was using as a shell because he was looking for a puzzle box that belonged to a friend and Goh had borrowed during a trip to space. Sometimes he is taken hostage. Trouble seems to find Jiro often.

!!Rumiko Maruno

-->'''Played by:''' Iwasaki Kazuko
A distant relative of the Sakatas who becomes Jiro's caretaker from Episode 38 onwards.

* CannotSpitItOut: She has feelings for Goh, which culminate in a dream sequence where she and Goh get married, only for MAT to be called into action, leaving her at the altar. That, and Alien Bat shows up! All the while, she never ever let it show.
* DamselInDistress: A couple of times, most notably in the last episode.
* ReplacementGoldfish: She's built up as a possible second love for Goh, but no such relationship develops. She seems to have feeling for Goh, and she does bond with Jiro, so she could be considered like a sister to him.

[[/folder]]

[[folder:Monsters and Aliens]]

!!Takkong
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/takkong_i.jpg]]

-->'''First Appearance:''' All Monsters Attack
One of two giant sea monsters that suddenly appeared in Tokyo Bay and battled each other to the death, causing great devastation. Takkong defeated Zazahn, but was driven away by a mysterious light (which was the work of Ultraman Jack) before it could turn its wrath on the city. However, the monster would return in the following episode, attacking oil rigs for consumption.

Takkong had long been considered for returning appearances in the ''Franchise/UltraSeries'' by the producers, having been planned for ''Film/UltramanSaga'' (where it was replaced by Gubila) and ''Series/UltramanOrb'' (which used Maga-Jappa instead), but finally made its long-awaited return to the franchise in ''Series/UltramanTaiga''.

* AnimalMotifs: While not obvious from its appearance, Takkong's design motif is octopuses, possessing a rounded body and numerous suckers.
* BreakoutCharacter: Like Aribunta from ''Series/UltramanAce'', Takkong brought back after some 47 years of absence in ''Series/UltramanTaiga''. He appeared in an episode of ''Series/UltramanZ'' as well. While his strange body makes it hard to fight it helps make him stick out. Along with his face being designed to be slightly cuter.
* {{Cephalothorax}}: The main difference from most examples is that the face is incredibly small in comparison to the rest of the body.
* MakingASplash: Can spray jets of water from its mouth and the suckers on the body.
* OurMonstersAreWeird: A giant sponge-octopus hybrid that eats oil.
* SeaMonster: Just suddenly appeared in Tokyo Bay one day to battle Zazahn.
* ScrewThisImOuttaHere: Jumped right back in the water when Ultraman first appeared. He came back in Episode 2.
* SmallRoleBigImpact: While at the end of the day he’s just another MonsterOfTheWeek, he is responsible for killing Goh which is the main catalyst for Ultraman Jack to merge with him to save his life.

!!Zazahn
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/zazahn.png]]

-->'''First Appearance:''' All Monsters Attack
The second of two sea monsters to unexpectedly appear in Tokyo Bay. It fought Takkong and destroyed much of the surrounding city in the process, but was ultimately defeated by the sponge-octopus monster.

* {{Expy}}: Of [[Film/GodzillaVsHedorah Hedorah]] (who debuted around the same time). The two look very similar to each other, and both have similar motives, being drawn to humanity because of the pollution in Tokyo Bay.
* MuckMonster: Sort of. Though it is clearly made of seaweed, Zazahn's BossSubtitles are "Sludge Monster", which was particularly relevant to 70's Japan due to the serious pollution crisis of the time.
* SeaMonster: Like Takkong, it just suddenly appeared out of the deep one day in Japan.
* WeHardlyKnewYe: He's in the episode for a few minutes before dying and is never mentioned again.


!!Earthtron
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/earthtron_galaxy_neo_2.png]]

-->'''First Appearance:''' All Monsters Attack
The very first monster battled by Ultraman Jack, Earthtron suddenly appeared in the Japanese countryside shortly after Ultraman Jack had merged with Goh.

Earthtron's design was intended to be a tribute to Franchise/{{Godzilla}} as Creator/IshiroHonda directed his debut episode. Because of this, the monster has also made many reappearances in the ''Franchise/UltraSeries'' since then.

* BreakoutVillain: While not as iconic as the likes of Bemstar and Gudon, Earthtron has proven popular enough to reappeared in many series since it returned in ''Series/UltramanMebius''.
* BreathWeapon: A beam of magma.
* NotZilla: Earthtron's design was based on Godzilla's (though not designed from a Godzilla suit like [[Series/UltraQ Gomess]] and [[Series/{{Ultraman}} Jirass]]). He even had the same designer!
* SpellMyNameWithAnS: Earthron and Arstron are also used.
* StarterVillain: Although not the first monster to appear in the episode, Earthtron's the first to fight Ultraman Jack.
* TunnelKing: As his name suggests, he's a capable burrower.

!!Sadorah
[[quoteright:275:https://static.tvtropes.org/pmwiki/pub/images/sadora_mebius.png]]

-->'''First Appearance:''' The Evil Monster Realm of Terror
One of two monsters hiding in fog-shrouded mountains, Sadorah was the more dangerous of the pair and attacked any humans that entered its territory. Naturally, MAT headed out to investigate after Goh himself encountered the creature while patrolling the region.

Sadorah has made many more appearances in the ''Franchise/UltraSeries''. Often, the monster is given some powers though. The fog was made into a creation of Sadorah and it was given extending claws to strike at prey from the fog. Sadorah is often shown as a pack hunter in later appearances too.

* BreakoutVillain: Like Earthtron, Sadorah has made a number of reappearances in the franchise, starting with ''Series/UltramanMebius''.
* DirtyCoward: Being incredibly weak, Sadorah prefers to use the cover of its fog to strike at enemies.
* OffWithHisHead: [[spoiler:Sadorah's death.]]
* OminousFog: In its original appearance, the fog was everywhere, but natural. Later appearances had Sadorah create the fog for stealth attacks. It also has {{EMP}} properties interestingly.
* PowerPincers: Sadorah's claws, which have become ExtendableArms in later appearances.
* ScaryScorpions: His design motif is of a scorpion especially with his pincer claws and segmented skin.
* SpellMyNameWithAnS: Has also been spelled Sadora, Sadola, and Sadolar.
* VillainTeamUp: With Detton when Jack showed up to kill both of them.

!!Detton
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/detton_10.jpg]]

-->'''First Appearance:''' The Evil Monster Realm of Terror
A creature closely related to [[Series/{{Ultraman}} Telesdon]] that inhabited in the Japanese mountains alongside Sadorah. Detton suddenly appeared during MAT's hunt for Sadorah, battling the other monster, as well as Ultraman Jack himself.

* {{Expy}}: Of Telesdon, unless the statements from Ultraman monster books claiming Detton is Telesdon's relative are true. In fact, Detton's role was originally meant for Telesdon, with the only physical differences being that Detton is a muddier colour and a stouter snout.
* LongLostRelative: According to some sources, Detton is Telesdon's sibling. Helps that Detton was created with the original (albeit significantly aged) Telesdon suit.
* OutsideContextProblem: For most of the episode it just focuses on Sadorah and then at the end, he just appears out of nowhere.
* VillainTeamUp: With Sadorah once Jack showed up to fight them, even though they had been clashing with each other just minutes ago.

!!Kingsaurus III
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/kingsaurus_lll.jpg]]

-->'''First Appearance:''' Certain Kill! Comet Kick!
A uranium-eating Mesozoic monster that suddenly appeared in the mountains one day. Kingsaurus III gave Ultraman Jack serious challenge with its array of atomic-based powers, forcing Hideki Goh to take up arms and train himself against a MonsterOfTheWeek for the first time.

* AchillesHeel: Its horns are the source of its powers, so snapping them off renders Kingsaurus III helpless.
* AimForTheHorn: Kingsaurus III's source of powers are it's horns, and once Jack lands a successful kick breaking it the monster is quickly defeated.
* BarrierWarrior: Can conjure a force field strong enough to block a Specium Ray. However, the top is left open to attack.
* BreathWeapon: Atomic breath, or rather a "U-235 Beam".
* CurbStompBattle: In the first Ultra-vs-kaiju fight, Kingsaurus III is on the delivering end thanks to it's forcefield {{No Sell}}ing all of Jacks' attacks. Then Jack severs its horns in their rematch, so this time Kingsaurus III is on the receiving end of a one-sided curbstomping.
* HornAttack: Asides from the obvious goring (which it uses to briefly cripple Ultraman Jack), Kingsaurus III can fire a variety of energy attacks from its horns.
* MetalMuncher: Feeds on uranium.
* MixAndMatchCritters: Sort of a mix of a ''Spinosaurus'' and a ''Triceratops''.
* MythologyGag: The "III" is because Kingsaurus III is the third "king" monster with the first being [[Series/{{Ultraman}} Red King]] and the second being [[Series/UltraSeven Eleking]][[note]]King Joe doesn't count because its named after ''Ultra Series'' producer, Tetsuo Kinjo rather than having royal intent[[/note]]. It's a bit of a subtle one so not too many fans have picked up on it.
* PrehistoricMonster: According to an unused script though, it's actually from the sunken continent of Atlantis!
* RadiationInducedSuperpowers: Gained its powers from the consumption of radioactive minerals. Helps that it can also [[AtomicSuperpower breath radiation like]] Franchise/{{Godzilla}}.
* ShockAndAwe: Touching Kingsaurus III's horns delivers an electric shock to prevent opponents from simply grabbing and tearing them off.
* TunnelKing: Capable of burrowing just as well.
* WakeUpCallBoss: The first monster to deliver a serious challenge to Jack and defeat him, forcing Goh to train hard for the first time.

!!Twin Tail
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/twin_tail.png]]

-->'''First Appearance:''' Two Giant Monsters Attack Tokyo
A strange prehistoric creature first discovered as a gigantic egg lying dormant underneath a Tokyo construction site. It hatched out as an adult shortly after its predator Gudon appeared, leading to a fierce three-way battle with Gudon and Ultraman Jack.

Twin Tail has made many more appearances in the ''Franchise/UltraSeries''. As you might guess, it's almost always with its arch-nemesis Gudon. The monster's bizarre design would go on to inspire many other creatures like [[Series/UltramanTiga Litomalus]] and [[Series/UltramanTaro Mukadendar]], as well as the popular twin tail hairstyle in Japan.

* AchillesHeel: The two glowing spots near its tails are sensory organs. Harming those causes Twin Tail great pain.
* ArchEnemy: Gudon, of course.
* BadassNormal: Having no powers didn't stop Twin Tail from overwhelming Ultraman Jack in their first fight (albeit with some help from Gudon, who wasn't any very pleased with the hero intruding on their fight either).
* BreakoutVillain: Not to the extent of Gudon below, but Twin Tail is quite popular for his unorthodox design.
* EyeScream: MAT blows out both of its eyes.
* FoodChainOfEvil: The natural prey of Gudon.
* MeleeATrois: Got into two of these between Gudon and Jack, firstly in the big city and later a rematch at an abandoned rock quarry.
* MultipleTailedBeast: The name is ExactlyWhatItSaysOnTheTin. Two tails.
* OurMonstersAreWeird: The sheer weirdness of his design would inspire dozens of other kaiju with heads on their bottoms and tails on their tops.In fact, it's why Twin Tail's one of the most iconic kaiju of the Ultra Series.
* PoisonousPerson: Kishida states that Twin Tail has a venomous bite, but [[InformedAbility nothing else in the series has ever indicated that, nor is it ever brought up again]].
* PrehistoricMonster: Simple as that.
* TailSlap / PrehensileTail: Obviously Twin Tail's main weapons. They're also capable of throttling Ultras if necessary.
* TunnelKing: Twin Tail is highly proficient burrower.
* WhipItGood: The two tails. They also have nasty little spikes for extra effect.

!!Gudon
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/gudon_movie.png]]

-->'''First Appearance:''' Two Giant Monsters Attack Tokyo
A prehistoric monster that is the natural predator of Twin Tail. It appeared shortly after Twin Tail's egg was discovered, eventually resulting in a three-way battle between Ultraman Jack and the two monsters that proved to be overwhelming for the hero.

Gudon has become one of Ultraman Jack's most iconic foes and has reappeared numerous times in the ''Franchise/UltraSeries'' (though not always with Twin Tail). Like Twin Tail, Gudon's design would also inspire other monsters with whip-like arms.

* ArchEnemy: Of Twin Tail, who also happens to be its natural prey.
* BadassNormal: Despite having ''no powers'', Gudon has proven to be one of the most formidable foes that Ultramen have faced.
* BreakoutVillain: Along with Bemstar and Alien Nackle, Gudon has appeared in almost every Ultraman series since ''Series/UltramanMebius''.
* FoodChainOfEvil: The predator of Twin Tail and more dangerous than it.
* MeleeATrois: Got into two of these between Twin Tail and Jack, firstly in the big city and later a rematch at an abandoned rock quarry.
* PrehistoricMonster: Just like Twin Tail. It's even stated to have hailed from the Jurassic period.
* TunnelKing: Although many have questioned how it burrows with whip-like arms. According to ''Series/UltramanMebius'', those whips are tentacles that vibrate earth to weaken it.
* WhipItGood / CombatTentacles: Its weapon of choice. They're powerful enough that a single whiplash can smash through solid stone.

!!Gorbagos
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/gorby.jpg]]

-->'''First Appearance:''' Operation Rainbow Monster
A nocturnal monster with chameleon-like powers that inhabited the Japanese mountains, living its life in obscurity. Gorbagos was spotted by Jiro when he accidentally caught it on camera, but the hard part for MAT was figuring out a way to counter its camouflage.

* BreathWeapon: A stream of fireballs.
* ChameleonCamouflage: Its main ability, as the camouflage is so strong that it effectively renders the monster invisible. Thus, MAT decides to spray the monster with an assortment of bright paints as a countermeasure. Additionally, its skin is textured to resemble the rocky mountains it inhabits.
* NonMaliciousMonster: Gorbagos was just sorta minding its own business, but MAT attacked it anyways when Jiro's camera spotted it. To drive the point further, the creature is shown to be completely docile during the daytime.
* SeeTheInvisible: Aside from the titular paint-spraying operation performed on the monster, cameras will always capture Gorbagos no matter how well-camouflaged.

!!Ghostron
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/ghostron_pn.png]]

-->'''First Appearance:''' Monster Time Bomb
An Earthtron-like monster that got an extremely powerful MAT weapon called the X-Bomb Missile stuck on its tail in a botched solo attempt by Goh to kill it, making this otherwise fairly weak kaiju much more dangerous than normal.

* AchillesHeel: Ghostron has extremely poor eyesight. Fortunately, his hearing compensates.
* BreathWeapon: A heat beam, not unlike Earthtron's magma beam.
* ButtMonkey: MAT repeatedly ridicules Ghostron as being unimpressive and pathetic (with the team's first reaction to seeing the monster being to comment on how weak it looks), with the episode even ascribing it many unflattering traits like being relatively small for a kaiju and being both slow-moving and slow-witted.
* LongLostRelative: Some books on Ultra monsters claim it's the sibling of Earthtron due to the fact that the two monsters are made from the same suit.
* MythologyGag: The MAT and Ultraman Jack are unable to eliminate Ghostron using conventional means due to the monster having a missile embedded in it's tail, much like Red King II from ''Series/{{Ultraman}}'' having swallowed several hydrogen bombs making things difficult for the heroes to handle.
* NonMaliciousMonster: Like Gorbagos, Ghostron was just minding his own business, but MAT decided he had to die. Unlike Gorbagos, this only makes things worse when a powerful bomb gets stuck on its tail, making the situation much more dangerous for Japan.
* SuperHearing: The creature has poor eyesight but has advanced hearing to make up for it.
* WhyAmITicking: The entire episode was basically about MAT trying to remove an extremely powerful bomb stuck on Ghostron's body. The monster doesn't seem to be aware of the bomb though.

!!Dangar
[[quoteright:180:https://static.tvtropes.org/pmwiki/pub/images/dangar_1.jpg]]

-->'''First Appearance:''' Monster Island S.O.S.
A strange monster living on the remote Southern Daitojima Island off Japan's coast. It happened to be that Minami had become stranded on that island in a plane crash, forcing MAT to move in for a rescue operation.

* BewareTheSillyOnes: Despite Dangar's goofy appearance, it's still by no means a friendly monster.
* DreadlockRasta: Whatever the hell those things on Dangar's head are, they resemble dreadlocks
* HookHand: In the form of simple one-clawed hands.
* NonMaliciousMonster: Dangar was content to live on the island so long as it was left alone. However, it wasn't very friendly towards anybody else stepping into its territory, so MAT had to kill it.
* SpellMyNameWithAnS: Has also been spelled Dunger, Danger, and Dungar.

!!Stegon
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/stegon_7.png]]

-->'''First Appearance:''' Dinosaur Explosion Directive
An undead dinosaur awoken by a construction site. Unhappy about having its eternal rest disturbed, Stegon goes on a rampage, but while MAT is finding ways to destroy the monster, Jiro and his class (who had originally found its bones before the construction crew stepped in to work) instead take pity on the creature.

* BreathWeapon: Can spray a fire extinguishing mist from its mouth. While it uses this ability for the sole purpose of foiling a plan by MAT, it also serves handy for blinding Ultraman Jack in the episode's fight.
* DemBones: The animated skeleton of an already dead prehistoric creature.
* TheJuggernaut: Totally immune to the Specium Ray.
* NinjaZombiePirateRobot: It's an acid-spitting zombie dinosaur, what more could you want?
* NonMaliciousMonster: Despite its dangerous abilities, Stegon is a fairly docile creature unless disturbed and likely would have never been a threat to anyone had its bones been left alone by the construction workers and MAT.
* RedEyesTakeWarning: The only hint of life in its body.
* {{Stellification}}: In the end, Jack [[spoiler:turns it into a constellation because Jiro and his classmates pleaded for Jack to hold back from killing it]].
* SuperSpit: Its acidic drool, which can dissolve humans in seconds, but curiously, has no effect on buildings.

!!Mogunezun
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/mogunezun.jpg]]

-->'''First Appearance:''' Poison Gas Monster Appears!
A poisonous monster that had been consuming copious amounts of poison gas canisters that had been illegally dumped in the wilderness by the Japanese Imperial Army after the Second World War, making the monster's toxic powers even deadlier!

* BreathWeapon: Breathes a toxic gas that has similar properties to mustard gas - a power further enhanced by its consumption of manmade chemical weaponry.
* DeadlyGas: Mogunezun is intended to be for mustard gas and other chemical weapons as Franchise/{{Godzilla}} is to nuclear radiation and the atomic bomb.
* DoesThisRemindYouOfAnything: The kaiju was pretty much created by the screenwriters as a commentary on Japanese usage of chemical weapons in the Second World War, with the usage of poison gas been treated very seriously here.
* HumansAreTheRealMonsters: While the monster isn’t shown sympathetically like most examples, the episode clearly shows that it only became as dangerous as it was because of human creation of chemical weapons and the illegal dumping afterward by the Imperial Japanese government of World War II.
* PoisonousPerson: Breathes toxic gas and feeds on poisonous substances to strengthen its own toxins.
* SpikesOfDoom: Well, more like quills of doom, but they're still loaded with enough deadly poison to give Ultraman Jack some trouble.
* TunnelKing: Gets around unnoticed by burrowing.

!!Shugaron
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/shugaron.png]]

-->'''First Appearance:''' Revenge of the Monster Shugaron
A monster that dwells in the Shirakami Mountains, but suddenly started rampaging shortly after a noisy highway started development in the area. It has mysterious connections to the great artist Ushiyama, who once lived in the region as a hermit with his daughter Shizuka and spent his time painting its landscape.

* AssholeVictim: The first victim of his rampage? A couple of perverts messing with Shizuka.
* BreathWeapon: A heat beam.
* {{Expy}}: While there is no physical resemblance, it borrows traits from [[Series/{{Ultraman}} Hydra and Woo]], as like the former its attacks target roads and drivers, while like the latter it's implied to be the protective spirit of a deceased parent.
* EyeScream: Thanks to MAT's firepower, though it only makes Shugaron even more furious.
* NonMaliciousMonster: Shugaron was completely content to be left alone, only rampaging when traffic started coming into the Shirakami Mountains.
* OurGhostsAreDifferent: It's implied that Shugaron is in fact the vengeful spirit of Ushiyama, coming back as a monster to punish humanity for disturbing the landscape.
* TragicMonster: In some ways, Shugaron's rampage is justified, as the episode goes to great lengths to emphasize the SceneryPorn of its home that is being taken down for a busy highway. Made even more tragic by how it kills Shizuka in its rampage.

!!Seamons
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/seamons_0.png]]

-->'''First Appearance:''' Terror of the Tsunami Monsters - Tokyo's Big Pinch
The female of a mated pair of sea monsters from the waters around Papua New Guinea that come to Japan to lay eggs, overwhelming Ultraman Jack using their ability to control the weather and the seas. She was the first of the two to battle Jack and MAT, calling forth her mate Seagorath when things got too intense for her.

* BattleCouple: With Seagorath. She proves to be easily overwhelmed by JSDF firepower alone, but when she calls in her mate, the tables are turned.
* BizarreSexualDimorphism: They're a mated pair, but Seamons is a stout rhino-like quaduped, while Seagorath is a towering dragon-like biped.
* BlowYouAway: Can create tornadoes like Seamons.
* CombinationAttack: Seamons and Seagorath utterly devastate Tokyo with their combined powers, including the creation of an gargantuan tsunami in Tokyo Bay.
* EatDirtCheap: She attacks a ship carrying precious gems to consume the cargo and later starts devouring stone from a cement plant. Goh speculates that she's doing this to harden her unborn eggs' shells once she lays them.
* EyeScream: MAT manages to blow out one of Seamons' eyes during the final fight.
* HornAttack: Shoots lightning from her horn.
* MakingASplash: Can create tsunamis, as suggested by her subtitle "Tsunami Monster".
* NonMaliciousMonster: Seamons is described as normally being a peaceful creature that only becomes aggressive when it is ready to lay eggs, having come to Tokyo Bay to find a safe nesting site. Unfortunately, the JSDF's efforts to get rid of her only further enrage her and lead to her calling forth her much less friendly mate, Seagorath.
-->'''Goh:''' Forgive us. You were too powerful for your own good.
* PunnyName: She's a sea monster named Seamons.
* SeaMonster: A rhinoceros-like monster that hides in the oceans around Papua New Guinea, becoming the subject of sailors' stories and native songs.
* ShockAndAwe: Can shoot lightning from her nose horn and create thunder.
* SummonBiggerFish: Is able to flash her horn to call forth Seagorath to protect her.
* WeatherManipulation: By using her horn, she can conjure typhoons, hurricanes, and lightning storms.
* WhatHappenedToTheMouse: [[spoiler:Seagorath dies of his injuries shortly after Ultraman Jack forces him to retreat, hence being revived by Alien Nackle, but Seamons' fate is left unanswered, with her last appearance being fleeing with her mate back to the sea.]]

!!Seagorath
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/seagorath.png]]

-->'''First Appearance:''' Terror of the Tsunami Monsters - Tokyo's Big Pinch
The second of two sea monsters that attack Tokyo using their ability to control the weather and the seas, appearing to assist his mate Seamons when the JSDF launches an unprovoked attack on her. Seagorath would later be brought back by Alien Nackle (via StockFootage) to battle Ultraman Jack again and allow the wicked invader to study Jack's weaknesses.

* AchillesHeel: Destroying Seagorath's horn renders him totally powerless. No word on if the same applies with Seamons.
* AimForTheHorn: MAT blasts off his nasal horn in Jack's second battle with Seamons and Seagorath.
* BackFromTheDead: Thanks to Alien Nackle.
* BattleCouple: With Seamons.
* BizarreSexualDimorphism: They're a mated pair, but Seamons is a stout rhino-like quaduped, while Seagorath is a towering dragon-like biped.
* BlowYouAway: Can conjure huge windstorms, as suggested by his subtitle "Tornado Monster".
* CombinationAttack: His powers are already formidable alone, but with Seamons' they become almost godlike.
* HornAttack: Shoots lightning from his horn.
* MakingASplash: Can create tsunamis like Seamons.
* SeaMonster: A dragon-like monster that hides in the oceans around Papua New Guinea, becoming the subject of sailors' stories and native songs.
* ShockAndAwe: Can shoot lightning from his nose horn and conjure lightning.
* SpellMyNameWithAnS: Also referred as Seagoras.
* WeatherManipulation: By using his horn, he can conjure typhoons, hurricanes, and lightning storms.

!!Eledortoise
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/eledortus_i.png]]

-->'''First Appearance:''' Revenge of the Monster Lad
An electricity-eating turtle-like monster able to turn invisible. It was an object of fascination for a boy named Shiro, whose father was a train operator who had been killed years ago by the monster, although MAT dismissed the case as a train accident caused by human error, embittering Shiro towards the organization.

* AchillesHeel: As a turtle kaju, its head is its most vulnerable point.
* BreathWeapon: A bright blue beam of electrical energy.
* EnergyAbsorption: It needs to consume electricity in order to maintain its electrical powers.
* {{Expy}}: Of Neronga from the original ''Series/{{Ultraman}}'', another electricity-eating quadruped able to turn invisible.
* {{Invisibility}}: Eledortoise's main ability. Unlike Neronga however, it can turn invisible at will instead of needing to consume electricity to power it. This ability is also the reason why MAT dismissed the death of Shiro's father as an accident, as they found no evidence of its presence and refused to believe the creature existed.
* ShockAndAwe: Eledortoise is capable of electrifying its body and shooting a powerful cluster of lightning from the two prongs on the rear end of its shell.
* SpellMyNameWithAnS: Eledortoise or Eledortus?
* StockholmSyndrome: Despite the fact the monster killed his father and rendered him lame in one leg, Shiro has a weird affection to it, bordering on obsession. His bitterness towards MAT leads him to see Eledortoise as something of a monster of his own to command against them despite it probably not even knowing he exists. He even mourns it when it’s finally killed.
* YouKilledMyFather: Played with. Shiro has a... complex relationship with Eledortoise because of this. While he hates the creature for killing his dad and crippling his right leg, he also wishes to see it defeat MAT due to his anger towards them for having previously refused to believe his dad was killed by Eledortoise and instead deciding that his dad was killed in a train accident of his own error.

!!Terochilus
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/terochilus_0.png]]

-->'''First Appearance:''' Mystery of the Giant Bird Monster Terochilus
A prehistoric bird-like monster that inhabited volcanic Mt. Iou on Aku Island off the coast of Japan. It caused a lot of trouble for MAT, Ultraman Jack, and the JSDF when it began to seek a place to build its nest, which results in Tokyo receiving the brunt of the attack.

* BlowYouAway: Like most winged kaiju, it can create enormous gusts with its wings.
* BreathWeapon: A spray of webbing that it normally uses to create its roost, though they're perfectly useful in entangling Ultramen as well. Additionally, the substance the webs are made out of transforms into a blinding toxic gas when in contact with vehicle exhaust, although extreme heat can melt them without any side effects.
* DisneyVillainDeath: [[spoiler:It’s sent falling to the ground by Jack where it dies on impact.]]
* FeatheredFiend: Even if it is lacking in feathers (they're all on the head and neck), Terochilus is a surprisingly formidable monster.
* GiantFlyer: It's a 60-meter-tall pterodactyl-bird monster, what did you think?
* HomeFieldAdvantage: As a bird kaiju, MAT and Jack have great difficulty taking on it during aerial dogfights in their first match, due to how fast it is in flight. However, the tables are turned in the second match when Jack manages to force the kaiju to fight him on the ground.
* TheJuggernaut: Asides from taking two episodes to defeat, it also survived two direct hits from the Specium Ray.
* NasalWeapon: Terochilus can fire energy bullets from its nose.
* PrehistoricMonster: An ''Archaeopteryx''-based kaiju that resembles a pterodactyl. Its even described as originating from the Cretaceous period.
* PteroSoarer: Although its actually based on ''Archaeopteryx'', but you have to remember that kaiju are never supposed to be realistic.
* TruthInTelevision: While its webbing ability may seem like just a weird monster power to give to a bird but some birds are able to [[https://en.wikipedia.org/wiki/Edible_bird%27s_nest do this with their own saliva.]]

!!Bemstar
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/bemstar.png]]

-->'''First Appearance:''' Series/UltraSeven Arrives!
A flying monster from the Crab Nebula able to consume energy with its stomach mouth, Bemstar made itself known to Earth when it made a beeline for the planet and devoured a space station with people inside along the way. Ultraman Jack got the Ultra Bracelet from Series/{{Ultraseven}} in order to counter its powers. It would later be brought back by Alien Nackle (via StockFootage) in order to study Ultraman Jack's combat capabilities.

Due to being one of Ultraman Jack's most dangerous and famous opponents, as well as appearing in the first episode to have Ultras from different shows meet, Bemstar has become a staple of the ''Franchise/UltraSeries''. Almost always a formidable opponent, Bemstar's energy-consuming abilities make it a constant pain for our beam-using heroes.

* AchillesHeel: Cutting attacks. While it can absorb energy blasts, it can’t really do much against any blade-based moves.
* BackFromTheDead: Twice actually. First was by Alien Nackle to study Jack's combat and second was by [[Series/UltramanAce Yapool]] in ''Series/UltramanTaro''.
* BellyMouth: That weird pattern on its belly? That's its second mouth (referred by many as the gorge), or the one it uses to eat energy attacks.
* BigEater: Especially for energy.
* BreakoutVillain: Has appeared in nearly every series since ''Series/UltramanMebius''. Up there with the likes of [[Series/{{Ultraman}} Gomora, Red King, Zetton,]] [[Series/UltraSeven and Eleking]] for most popular and iconic Ultra monsters.
* BreathWeapon: Some artwork for the Ultra Series depicts Bemstar as being able to breathe a beam of energy, [[InformedAbility but that has never appeared in the shows]].
* EnergyAbsorption: Thanks to its BellyMouth. However, the way the mouth does so varies from series to series.
* ExtremeOmnivore: Although energy is the mainstay of Bemstar's diet, living beings and machinery have also been consumed by the monster's gorge.
* GiantFlyer: As a bird-like kaiju, although it mainly flies through space instead.
* HornAttack: Shoots energy bolts from the small horn on its head.
* NoSell: Beam attacks have absolutely no use against Bemstar as it simply eats them up. Slicing attacks, on the other, hand...
* OffWithHisHead: [[spoiler:His fate, though Jack also chops off its wings for a good measure.]]
* VillainousGlutton: Bemstar has a ravenous appetite for energy of any sort. In fact, the reason why it comes to Earth is because Earth's energies are specially delicious to the monster.
* TheWorfEffect: In its original appearance as Ultraman Jack's most deadly foe up to that point. Has kept this reputation in later appearances.

!!Sartan
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/sartan_0.png]]

-->'''First Appearance:''' The Giant Invisible Monster from Outer Space
An elephant-like monster from outer space with the ability to turn invisible. Sartan hatched out fully grown and wholly invisible from a meteorite-shaped egg discovered by Jiro and his friends, injuring Jiro in its invisible rampage and challenging MAT with its powers.

* CameFromTheSky: The first indication of its existence is a meteorite-egg-thing that falls from space and hatches out nothing... until buildings start getting smashed by an unseen force!
* {{Gonk}}: Considered by many fans to be one of the most grotesque-looking monsters in the Ultra Series, which can be attributed to its long and sparse hairs, incredibly wrinkly skin, and the fact that elephant-based kaiju aren't very common.
* {{Intangibility}}: Is able to turn ghostly to phase through buildings and escape attackers.
* {{Invisibility}}: The episode gives us ExactlyWhatItSaysOnTheTin. Sartan generally prefers to remain invisible, only revealing when attacked or fighting.
* {{Ninja}}: His BossSubtitles is "Ninja Monster" in reference to his invisibility powers. Besides that, he doesn’t really have much in common with ninjas.
* OurMonstersAreWeird: An extraterrestrial elephant that can turn invisible!
* SeeTheInvisible: While he can turn invisible, he can’t hide his shadow. Additionally, hitting Sartan will cause him to become visible again, while MAT uses a special infrared detector to locate the monster when it's invisible.
* TheShadowKnows: Sartan's enormous shadow will always remain visible.
* WhaleEgg: It hatches from an egg, despite its elephant-like features.

!!Magnedon
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/ultrmn_jck_mgndn.png]]

-->'''First Appearance:''' The Monster is a Shooting Star in Space
A docile monster from deep beneath the earth that constantly emits intense magnetic waves from its body. Due to the amount of social disruption its power brought to humanity, MAT was forced to kill the peaceful creature, but Magnedon's slew of powers made this a lot harder than it seemed.

* AchillesHeel: Because Magnedon draws its magnetic abilities from Earth's own magnetism, it becomes completely powerless if somehow taken into space and away from Earth.
* BreathWeapon: A stream of flames.
* FromASingleCell: Magnedon can regenerate from being blown to pieces if its body is exposed to water and electricity, such as during a lightning storm.
* GentleGiant: A purely peaceful creature, but MAT and Ultraman Jack had to try kill it anyways due to the inconveniences of living alongside a magnetic kaiju. [[spoiler:Jack even feels quite bad after killing Magnedon.]]
* MagnetismManipulation: Its body constantly emits magnetic waves, capable of pulling a jumbo jet straight out of the sky. Apparently, it gains this ability by absorbing Earth's natural magnetic energy.
* MeaningfulName: His name is derived from the word "magnet". The monster itself has magnetic abilities.
* RockMonster: Despite appearances, its body is composed of igneous rock (which tend to be more magnetic than other types of rocks), making it an example.
* SelectiveMagnetism: Magnedon is also able to magnetize targeted objects, as it does with Ultraman Jack in the episode's fight.
* {{Sleepyhead}}: Magnedon spends a large chunk of the episode asleep and completely oblivious to both the destruction it inadvertently causes and MAT's attempts to kill it.
* {{Stellification}}: Ultraman Jack creates a constellation of Magnedon after [[spoiler:killing it]], similar to what he did with Stegon, because it wasn't truly malicious.

!!Beacon
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/beacon_i.jpg]]

-->'''First Appearance:''' Monster Channel
A bizarre extraterrestrial monster that consumes electric signals, using them to broadcast whatever it sees to televisions. It made a living out of disrupting air traffic by attacking planes and causing them to explode or collide midair, while also troubling Tokyo's populace through its disruption of radio signals.

* BlindedByTheLight: Can create a disruptive aurora of light in order to blind airplane pilots and cause midair collisions.
* BondVillainStupidity: During the end of their fight, he has Jack at his mercy. So what does he do? He just floats above him doing nothing. This gives Jack enough time to recover and kill him.
* CuteLittleFangs: Two of them just underneath its nose. Surprisingly, they're capable of hurting Ultraman Jack.
* DoNotAdjustYourSet: Beacon's main gimmick is that its presence messes with radio, radar, and television signals, creating interference and causing the TV to see whatever it sees.
* ExtraEyes: Has 3 eyes, the side ones being red and the center one being yellow.
* EyeBeams: Strong enough to shoot down planes and contest with the Specium Ray.
* OurMonstersAreWeird: Easily one of the weirdest critters created for the ''Franchise/UltraSeries'', being a bug-eyed, spike-backed monster able to manipulate television waves and fly by floating on its belly.
* ShockAndAwe: Tackles Jack and delivers a powerful electric shock that knocks him unconscious during the fight.
* SpellMyNameWithAnS: Also spelled as Bea'''k'''on.

!!Gokinezula
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/gokinezulaa.png]]

-->'''First Appearance:''' I Will Kill This Monster
A monster that lived at Yumenoshima Landfill, hiding underneath the mountainous heaps of trash and consuming plastic. However, its activities caused methane eruptions to ignite, and when MAT responded by extinguishing the fires, the monster was subsequently driven to the surface.

* AllWebbedUp: Courtesy of his ability to spit out sticky webbing.
* BreathWeapon: A spray of mist that turns into sticky webbing upon contact with solid material in order to slow down opponents and disrupt MAT's fighter jets.
* BulletCatch: Can do the kaiju equivalent of this with missiles, thanks to its surprisingly swift reflexes. It can even catch this with its teeth without harm (although Ultraman Jack finds a way to take advantage of that)!
* ExtremeOmnivore: Feeds entirely on plastic.
* HoistByHisOwnPetard: Twice in the fight. First. it’s tricked into firing its web blast into the air causing itself to be coated in said webbing. Then, when it grabs [[BulletCatch a rocket with its teeth]], [[spoiler:Jack takes the opportunity to blow the missile up blowing the creature’s head off.]]
* MeaningfulName: Gokinezula's name is a combination of "gokiburi" ("cockroach") and "nezumi" ("rat"), which refers to its love of garbage and association with areas filled with trash and filth.
* SuperReflexes: This ability is what allows it to perform its BulletCatch skills.
* YourHeadASplode: [[spoiler:Its fate caused by catching a missile with its mouth that Ultraman Jack then detonates with a Specium Ray.]]

!!Zanika
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/zanikaa.png]]

-->'''First Appearance:''' Dark Monster, Spit Out the Stars!
A crab-like monster from a planet in the Cancer constellation that fled to Earth in a state of agony and madness when its homeworld was devoured by Vacuumon. Unaware of Vacuumon's slow arrival to Earth, MAT mistook Zanika for a threat and decided to destroy the terrified and maddened creature.

* AnArmAndALeg: Jack tears off Zanika's claws during the fight, forcing the monster to beg for mercy and explain what's really going on. [[spoiler:Mercy is granted, and after Zanika's homeworld is restored by Jack defeating Vacuumon, the pincers grow back.]]
* CameFromTheSky: Arrives on Earth in the form of a comet.
* GiantEnemyCrab: From the constellation of Cancer, fittingly enough.
* HealingFactor: While never seen in the series, WordOfGod states Zanika can regenerate lost limbs, just like normal crabs, [[spoiler:with the pincers Jack tore off growing back after the monster returned home.]]
* InvadingRefugees: Zanika came to Earth to escape Vacuumon's hunger, and is normally a pretty peaceful guy, but due to having gone berserk from the loss of its homeworld and MAT just being worried about the presence of a giant alien monster, it had to be dealt with. [[spoiler:Fortunately, Ultraman Jack spares Zanika and the monster even warns him of Vacuumon's arrival.]]
* SuperSpit: Constantly drools paralyzing foam from its mouth that it can spit at enemies.

!!Vacuumon
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/vacuumon_0.jpg]]

-->'''First Appearance:''' Dark Monster, Spit Out the Stars!
A terrible nebula-like entity that consumes planets and other celestial bodies. The utterly colossal Vaccuumon made a slow path towards Earth that was merely hinted at to humanity by the vanishing of entire constellations in the sky and the arrival of a fleeing Zanika.

* AchillesHeel: Vacuumon's gargantuan size creates immensely powerful pressure inside its body that if destabilized in any way, will cause the monster to collapse under its own mass and the sheer gravity it produces as a result of said mass.
* BlobMonster: Probably one of the biggest ever imagined.
* EatMe: Used by Jack, who then slashes Vacuumon up from the inside with the Ultra Bracelet like a knife to a plastic bag.
* EldritchAbomination: A titanic blob-like entity akin to a living nebula that consumes planets, causing pain and madness in those with a special connection to the stars and worlds it consumes (such as Zannika, as well as an astrologer named Junko whose zodiac sign was Cancer).
* PlanetEater: Though it also consumes stars, as the characters notice some of the constellations disappearing as it makes its way to Earth.

!!Kupukupu / Kingstron
[[quoteright:275:https://static.tvtropes.org/pmwiki/pub/images/kingkupu.png]]
[[caption-width-right:275:Above: Kupukupu\\
Below: Kingstron]]

-->'''First Appearance:''' Horror! Birth of the Condo Monster!
A peaceful little space creature that MAT had almost immediately killed upon discovery out of fear that it would transform into a far more dangerous monster if left alone. But when a young monster-loving boy named Akio manages to sneak off with a piece of its remains, said piece attached itself to the walls of his bedroom and slowly transformed itself into the ferocious giant Kingstron.

* AdaptiveAbility: Killing Kupukupu allows the monster to metamorphose by merging with any inanimate matter that its remains come in contact with, eventually regenerating into a completely new monster. However, Kupukupu doesn't grow into Kingstron entirely by itself, as Akio's comments and suggestions about what traits a strong monster should have are adopted by the Kupukupu piece merged with his bedroom wall.
* ArtInitiatesLife: The surviving piece of Kupukupu slowly evolves into Kingstron by appearing as a drawing on Akio's bedroom wall that develops Kingstron's features (based on ideas from Akio of what a good kaiju should be like) and also gets bigger and more lifelike.
* BreathWeapon: Kingstron breathes fire.
* {{Expy}}: Let's see. A peaceful, white, featureless monster treated as a threat by the attack team that later transforms into a fiercer-looking creature that comes to life from a child's drawing. Sounds an awful lot like [[Series/{{Ultraman}} Gavadon]], no?
* FromASingleCell: As Kupukupu. Overlaps with AdaptiveAbility.
* TheJuggernaut: Kingstron was not fazed by the Specium Ray or even by Jack snapping off its horn. Although given that it was formed partly from Akio's ideas of what a powerful monster should be like, this is not entirely surprising.
* HumansAreTheRealMonsters: Kupukupu was a totally defenseless and innocent monster blown up completely out of paranoia that it would evolve into a deadly kaiju. MAT paid dearly when it resulted in the 60-meter-long Kingstron trashing Tokyo.
* {{Irony}}: MAT killed Kupukupu because they feared it would metamorphose into something dangerous. Instead however, ''because'' they killed Kupukupu, it transformed into exactly what they were afraid of.
* MetamorphosisMonster: Kupukupu is a small, white, featureless quadruped, but when a piece of its corpse merges with an apartment's walls, it transforms into Kingstron, a horned tortoise-like kaiju with spikes on its shoulderblades. Ironically, Kupukupu's metamorphosis into Kingstron was the inadvertent result of MAT being afraid that Kupukupu would grow into something huge and destructive if not killed.
* SpikesOfDoom: Kingstron has these on its shoulders and tail, which can fire energy bolts. They're capable of rotating too, allowing the monster to turn itself up if flipped over.
* StrippedToTheBone: [[spoiler:Kingstron's fate, thanks to the Ultra Bracelet.]]
* WoobieDestroyerOfWorlds: A perfectly harmless monster turned into a not-so-harmless one by human distrust of other beings.

!!Zagoras
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/zagorath.png]]

-->'''First Appearance:''' Leaving My Home Planet Earth
A tiny alien creature from the planet of the same name that came to Earth in ancient times on a massive radioactive meteor. In the present, Planet Zagoras is passing by Earth, awakening the creature, which has mutated into a kaiju and is now rampaging about as it waits for the meteor (composed of a unique element magnetically attracted to Planet Zagoras' immense gravity) to rise from the ground and return to space, even despite the fact a small village has now been built over the giant meteor's burial spot.

* BreathWeapon: A stream of fire.
* DeathByIrony: [[spoiler:Jack kills him by throwing his body into the very meteor he wanted to leave Earth in, destroying both.]]
* SpellMyNameWithAnS: Zagoras or Zagorath?

!!Nokogirin
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/nokogirin.jpg]]

-->'''First Appearance:''' Mystery! Homicidal Beetle Incident!
An extraterrestrial beetle able to fire deadly laser beams from its three horns. Nokogirin initially arrived on Earth from a meteorite at the size of a typical insect and murdered several people. MAT subsequently went after it, but they inadvertently caused the monster to turn kaiju-sized!

* AchillesHeel: Nokogirin's third horn is the source of its sole attack, so destroying it massively weakens the monster.
* BigCreepyCrawlies: It's normally about the size of a relatively large stag beetle, but it turns into a kaiju at the end of the episode.
* CameFromTheSky: Arrives on Earth as a meteorite.
* DeathRay: Its primary power is to shoot disintegration rays from its horn.
* EnergyAbsorption: Grew from the size of a large beetle to that of a kaiju by absorbing the laser beams of MAT's weapons. Presumably, this was also how it resisted the Specium Ray.
* EyeScream: Thanks to MAT, allowing Jack to cut off its third horn.
* FourLeggedInsect: [[AvertedTrope Averted]] when Nokogirin’s bug-sized, but played straight as soon as it starts growing, as it loses two of his legs for no explained reason.
* TheJuggernaut: Another of those monsters that casually brushes off the Specium Ray in order to have Ultraman Jack use another power instead.
* MakeMyMonsterGrow: MAT's firepower causes Nokogirin's size to increase from that of a standard bug to that of a kaiju in the span of a few hours.
* MonumentalDamage: Destroys the TokyoTower with its death laser at one point in the battle with Jack when Jack leaps out of the way of the attack.
* NonMaliciousMonster: Despite killing several humans, MAT deduces that Nokogirin had only attacked them due to mistaking the sounds of the appliances they were using (like an electric razor and a hairdryer) to be the buzzing of rival males and notes it seems to be otherwise fairly docile. However, they decide to destroy the creature anyway on account of how dangerous its abilities are.
* SpellMyNameWithAnS: Due to "L-R" confusion in Japanese, Nokogirin is sometimes called Nokogilin.
* ToughBeetles: An extraterrestrial stag beetle that can fire deadly laser beams and casually brush off Ultraman Jack's attacks in its kaiju form.
* TunnelKing: Escapes from MAT by burrowing underground, later re-merging kaiju-sized when it resurfaces.

!!Gronken
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/gronken.png]]

-->'''First Appearance:''' Go to Hell with This One Blow!
A saurian monster with buzzsaws for hands that suddenly appeared out of nowhere one day. Gronken used its deadly appendages to make sneak attacks on humanity by slicing up various structures in the middle of the night and perplexing Japan with the presence of huge statues cut cleanly in two.

* AnArmAndALeg: Ultraman Jack rips off both of Gronken's arms, but the monster ''continues'' to fight!
* ChainsawGood: Gronken's body is covered in buzzsaws, but the ones that it utilizes are on its arms, which are capable of slicing through a statue of its size in half.
* OffWithHisHead: [[spoiler:Ultraman Jack defeats him by kicking off his head.]]
* OnlyAFleshWound: Jack cuts off both of its arms yet it still continues to fight.
* TunnelKing: It first makes itself known by bursting from beneath the ground, and retreats by burrowing back underground.

!!Varricane
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/varricane_i.jpg]]

-->'''First Appearance:''' Ultra Special Attack
A bizarre jellyfish-like monster from the seas around Micronesia that changes the weather wherever it goes. However, it does so in a cycle of recharging and discharging energy, becoming docile and creating calm blue skies when in the former state and entering a destructive rampage and producing massive typhoons in the latter state.

* AchillesHeel: Varricane discharges energy and creates typhoons by spinning its bell at high speeds, so creating a counterspin effect against the monster nullifies its typhoons.
* BreathWeapon: Toxic gas.
* {{Cephalothorax}}: The suit actor's head is hidden in the bell.
* CombatTentacles: Its arms and tail prove quite useful at wrangling Jack during their battle.
* EnergyAbsorption: Varricane is able to absorb electricity to quicken its recharging process, as it does when MAT attempts to weaken said process with anesthetic missiles. Additionally, it was also able to absorb the Specium Ray through its mouth without any effect.
* FlyingSeafoodSpecial: When in its docile recharging state, Varricane floats in midair completely passive towards its surroundings. However, it also flies during the battle with Jack, using its spinning bell to do so.
* HavingABlast: Varricane can flash the red spots on its dome to create explosions.
* NonMaliciousMonster: Goh perceives Varricane as such, seeing it as a natural phenomenon no more "evil" than the weather itself rather than a violent brute like most kaiju are. To some degree, the show seems to agree with him, as Varricane's presence during its docile state actually improves Tokyo's air quality immensely, and after the monster is vanquished, MAT gripes about Tokyo once again being overrun with choking smog (the final shot is even just of how polluted Tokyo's air is).
* OurMonstersAreWeird: Being a giant jellyfish that controls the weather around it is one thing, but every other little things about it makes it all the more bizarre.
* SeaMonster: A giant jellyfish from Micronesia.
* ShockAndAwe / ElectricJellyfish: Can deliver powerful electric shocks by grabbing enemies.
* SpinAttack: Varricane's bell spins when the creature is in its active energy-discharging state, creating massive typhoons to batter its surroundings.
* WeatherManipulation: Much like Seamons and Seagorath before it, Varricane is a sea monster that manipulates the weather. However, whereas Seamons and Seagorath do so at will, Varricane does so with only its presence. As a result, it cycles between periods of violent activity where its presence creates humongous typhoons with torrential rainstorms and periods of passive inactivity where its presence instead creates calm days with bright blue skies.

!!Yadokarin
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/yado.jpg]]

-->'''First Appearance:''' Jiro Rides a Monster
A hermit crab monster that turned an unmanned MAT space station called Space Station No. 5 into a makeshift shell before coming down to Earth to hide. MAT's investigations into the space station's sudden disappearance disturbed the monster, but eliminating it was made much more difficult by the fact Jiro had gotten trapped in the space station when he stumbled across it while exploring the woods that day.

* AchillesHeel: Being a hermit crab kaiju, Yadokarin has a very soft and vulnerable body. When Goh enters the space station to rescue Jiro, he is able to force Yadokarin out by effectively attacking from inside its shell. The ensuing one-on-one confrontation with Jack sees the hero easily overpower the monster, with Yadokarin trying to get back inside its shell to gain an advantage.
* AcidAttack: Can spray acid from its pincers.
* AttackOfTheMonsterAppendage: Yadokarin is a Type 2 example, initially lashing out with only its pincers from the bottom of the space station, but later revealing its head when provoked. We don't get to see the monster completely until Jack confronts it one-on-one.
* GiantEnemyCrab: A hermit crab to be precise.
* KillItWithFire: [[spoiler:After Jack spears Yadokarin with the transformed Ultra Bracelet, he finishes it off with the Specium Ray, causing the monster to burst into flames.]]
* ImpaledWithExtremePrejudice: [[spoiler:Its fate when Jack turns the Ultra Bracelet into a lance.]]
* MeaningfulName: Comes from "yadokari", or "hermit crab" in Japanese.

!!Oxter
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/oxter.jpg]]

-->'''First Appearance:''' Curse of the Skeleton God
A prehistoric water buffalo kaiju that slumbered in a lake near Mt. Daio, guarding a mass grave of prehistoric water buffalo bones in a nearby sinkhole. Any creatures that disturbed the bones were swiftly killed by Oxter, and when two paleontologists took some for study, MAT was called into action against the enraged creature.

* AchillesHeel: Oxter is entirely confined to its lake on account of having mutated into a creature only able to breathe underwater. So when Jack drains the lake during their battle, Oxter is completely screwed over for the rest of the fight.
* AlasPoorVillain: [[spoiler:MAT holds a small memorial service for Oxter after Jack kills it and its bones are buried, pondering that Oxter's protectiveness towards the buffalo bones was due to it feeling lonely as the last remaining member of its herd.]]
* AnimalMotifs: Oxter's primary motif is water buffaloes, although it really doesn't look anything like one.
* ArmlessBiped: It drags itself around on only two legs and a tail for support. The suit actor's arms are in its horns.
* BreathWeapon: Acid sprays capable of dissolving a man in seconds.
* BrutishBulls: An ancient, lake-dwelling kaiju that was once a water buffalo, although it does have some sympathetic qualities too.
* {{Cephalothorax}}: It really doesn't have an distinction between a head and a body.
* HomeFieldAdvantage: Oxter proves overwhelming for Jack early on in their battle on account of being able to fight underwater far better than Jack can. As a result, Jack decides to turn the tables on Oxter by using the Ultra Bracelet to drain the lake.
* HornAttack: They act as pincers too, clamping around Jack and pulling him underwater during their fight.
* OurMonstersAreWeird: A two-legged prehistoric water buffalo who can spit acid from his mouth, has a chameleon-like tongue, and can only breathe in water.
* OverlyLongTongue: Uses this to snatch and consume humans who disturb the buffalo bones it protects.
* NonMaliciousMonster: Oxter was content to dwell in its lair as long as the nearby water buffalo graveyard was undisturbed. [[spoiler:Ultraman Jack continues Oxter's duty by creating a rainstorm and mudslide to bury Oxter and the buffaloes' bones and refill the lake.]]
* PrehistoricMonster: A highly mutated prehistoric water buffalo that guards over the remains of its ancient kin.
* SpellMyNameWithAnS: Oxter or Oxster?
* StrippedToTheBone: [[spoiler:After killing Oxter with the Specium Ray, Jack fires another beam that reduces Oxter to a skeleton, allowing its remains to be buried alongside those of its water buffalo kin.]]
* SuperSpit: MAT's studies of Oxter's acid reveals to them that its actually a form of saliva, making its BreathWeapon an example of this.

!!Alien Zelan
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/ultrmn_jck_aln_zln.png]]

-->'''First Appearance:''' In Between a Devil and an Angel
-->'''Played by:''' Tetsuya Kaji (voice), Teruo Kazama (human form actor)
An alien who disguised himself as a mute and deaf boy named Teruo visiting the MAT base with Captain Ibuki's kindhearted daughter Minako. He taunted and tormented Goh through telepathy, goading the hero into lashing out against the disguised alien in order to discredit him, all while using his monster Plooma as a RedHerring for MAT.

Alien Zelan also makes small cameos in other Franchise/UltraSeries from time to time.

* BitchInSheepsClothing: Since only Hideki Goh is able to hear Zelan's taunts and warnings, the other MAT members just see Goh bullying Teruo. Only Captain Ibuki is willing to listen to Goh's accusations of the kid being an evil alien, but even he is reluctant as he doesn't want to hurt his daughter's friendship with Teruo.
* CreepyChild: While disguised as Teruo. Some of the shots they use to show of him communicating with Goh certainly make him even creepier.
* EyeBeams: He is able to fire a disintegration ray from his eyes whie in the form of Teruo.
* EyelessFace: He only has a series of bumpy ridges that act as his eyes.
* GenreSavvy: Zelan wants Goh to transform into Jack as part of his plan to defeat the hero and uses Plooma, a kaiju durable enough to survive the Specium Ray, to force Jack to use his Ultra Bracelet [[spoiler:in order to then control the Bracelet against Jack.]] He also deliberately endangers himself around Plooma during MAT's first confrontation with the monster so that the team will be unable to attack it without hurting Teruo.
* GlowingEyesOfDoom: His eyes glow blue in his Teruo disguise when he speaks telepathically to Goh or fires his EyeBeams.
* KickTheDog: Kills the nurse looking after him when she finds him working on the alien device [[spoiler:he uses to control Jack's Ultra Bracelet against the hero.]]
* MagnetismManipulation: He utilizes a magnetism-controlling alien device disguised as a schoolbag to [[spoiler:take control of Jack's Ultra Bracelet once the hero defeats Plooma, turning Jack's most powerful weapon against him.]]
* ManipulativeBastard: Asides from spending the episode tormenting Goh and enticing him to attack the alien in the disguise of a child, Zelan also takes advantage of the kindness of Captain Ibuki's daughter Minako to allow her to befriend him and convince her to let him come with her on a visit to her dad's workplace as part of his plans.
* {{Telepathy}}: Uses this to speak to Goh while in the form of Teruo.
* ThisWasHisTrueForm: Only appears in his true form at the end of the episode, with later series giving viewers longer glimpses of Alien Zelan's normal appearance.
* VillainBall: [[spoiler:His plan probably would’ve gone off without a hitch if it wasn’t for his need to torment Goh of his impending doom. This not only made Goh cautious about fighting Plooma, but he also alerts Captain Ibuki of the alien’s plan, who in turn find and kills the alien before he can finish off Jack.]]

!!Plooma
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/plooma.png]]

-->'''First Appearance:''' In Between a Devil and an Angel
Alien Zelan's monster of choice. The sinister invader sent out Plooma to attack Tokyo in order to distract MAT while Zelan himself concentrated on setting up his true strategy for defeating Ultaman Jack, warning Goh that by defeating Plooma, Ultraman Jack himself would consequently be killed.

* BreathWeapon: A red beam of energy referred to as the "Pulsar Shot".
* TheJuggernaut: Able to survive the Specium Ray without taking much damage. This is [[spoiler:what forces Jack to use the Ultra Bracelet to kill Plooma instead, in turn allowing Zelan to take control of the item.]]
* OffWithHisHead: [[spoiler:Its fate, thanks to the Ultra Bracelet.]]
* RedHerring: Plooma's purpose was to distract MAT from the real villain of the episode -- the disguised Alien Zelan. Its BossSubtitles are even "Decoy Monster".
* SpellMyNameWithAnS: Plooma or Pluma?
* TunnelKing; Burrows to escape MAT and reappear for its next attack.

!!King Maimai
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/king_maimai_i.jpg]]
[[caption-width-right:240:Adult Stage]]
[[caption-width-right:240:[[labelnote:Larval Stage]]https://static.tvtropes.org/pmwiki/pub/images/king_maimai_larva_extra.png[[/labelnote]]]]

-->'''First Appearance:''' Decisive Battle Under the Setting Sun!
A prehistoric insect-reptile monster that had been slumbering in ice for millions of years inside of Mt. Ryujin. The creature was slowly stirred to life by efforts to construct a tunnel through the mountain, causing disruptive earthquakes for the locals.

* AllWebbedUp: Managed to entangle Jack in its webbing spray by sneaking behind the Ultra.
* AnArmAndALeg: In its larval form, King Maimai lose an arm thanks to MAT grenade that Ueno dropped when it swatted him. However, it regains its arm when it metamorphoses into its adult form.
* AttackTheTail: Not as graphic as some other examples in the franchise, and unlike other Ultras, Jack didn't severe King Maimai's tail completely. But he ''did'' snap the monster's tail with his knees, with a very audible ''crunch'', rendering it useless for the rest of the fight.
* BreathWeapon: A spray of paralyzing webbing.
* CurbStompBattle: The battle between Ultraman Jack and King Maimai goes completely in the Ultra's favour, with Jack effortlessly crippling its wings, severing its tail, and pummeling King Maimai so badly that it needs to resort to playing possum in order to turn the battle around.
* FakingTheDead: During the fight with Ultraman Jack, King Maimai pretends to die and when Jack prepares to leave, King Maimai sneaks up on Jack and catches him off-guard with its paralyzing webbing.
* {{Fartillery}}: Its primary ability in its juvenile form is unleashing explosive farts, complete with turning its butt to face MAT.
* FeedItABomb: [[spoiler:Jack kills King Maimai by turning the Ultra Bracelet into an explosive and throwing it down the monster's throat.]]
* {{Gasshole}}: The larval form of King Maimai fights by farting!
* GiantFlyer: The sail-like wings on its back help out.
* HumanPopsicle: Or rather Kaiju Popsicle. Jack first stumbles across King Maimai frozen in slowly melting ice not long before the monster breaks free and burst from the mountain.
* MetamorphosisMonster: The monster starts off more reptilian in appearance, but then sheds his skin and emerges as the more insect-like form shown here just in time to fight Ultraman Jack.
* MixAndMatchCritters: Sorta looks like [[BigCreepyCrawlies a big cicada]] mixed with a dinosaur. However, it is explicitly compared to a snail at one point in the episode.
* PrehensileTail: Uses its tail to throttle Jack during the battle.
* PrehistoricMonster: King Maimai had been slumbering underground inside of ice for millions of years before being awoken by construction.

!!Alien Mates
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/ultramn_mbs_alun_mts.jpg]]

-->'''First Appearance:''' The Boy and the Monster Master
-->'''Voiced by:''' Kenjiro Uemura (also human form actor)
A peaceful alien who came to Earth to study its environment and establish diplomatic relations with humanity. He adopted an orphan boy named Ryo Sakuma, but soon found that Earth pollution was deadly to him, forcing him to take human form and put his plans aside while also losing his ability to detect the location of his spaceship hidden underground. Ryo helped the weakening alien to relocate his spaceship, but unfortunately, the local villagers shunned Ryo and believed him to be an alien. When they formed an angry mob to kill the child, Mates stepped forth to save his adopted son and was killed, with destructive consequences for the villagers.

Having appeared in one of the most critically lauded episodes in the entirety of the ''Franchise/UltraSeries'', Alien Mates' story would be continued in ''Series/UltramanMebius'' when the alien's biological son Beo would come to Earth in the award-winning SequelEpisode "The Monster Master's Legacy".

* AlienBlood: Light green.
* CreepyGood: Despite his rather eerie appearance (black pupilless eyes and pale white skin), Mates was a benevolent alien.
* DoesThisRemindYouOfAnything: The murder of Alien Mates by the angry mob was inspired by [[https://en.wikipedia.org/wiki/Kanto_Massacre anti-Korean violence following the Great Kanto Earthquake of 1923]], due to rumours that the Korean minority in Japan was engaging in criminal activities to take advantage of the Japanese people's devastated homes.
* FantasticRacism: A victim of this, and one of the major themes of the episode. In a sad irony, Mates was actually try to build friendly race relations with humans.
* HumansAreTheRealMonsters: Beaten to death by a gang of angry townsfolk for trying to defend his adopted son and being an alien. Additionally, the episode makes a point of how destructive humanity is to the environment by having Mates suffer from a slow and poisonous death at the hands of human pollution.
* InterspeciesAdoption: Mates adopted Ryo, a human orphan, as his son, and Ryo in turn tried to help Mates find his spaceship with plans on leaving Earth with him.
* MeaningfulName: "Mates" as in "friend", indicating his goodwill to Earthlings.
* PsychicPowers: He possesses significant psychic abilities, granting him telekinesis and a telepathic link to his spaceship and Muruchi (although the latter power is disabled by the harmful effects of human pollution on his body).
* SpellMyNameWithAnS: Sometimes spelled "Meits".
* TooGoodForThisSinfulEarth: And how! The first truly good alien in the franchise is killed by a mob of prejudiced humans. It's also revealed in ''Series/UltramanMebius'' that his adopted human son Ryo also died young, though many years after Mates and long enough for him to pass Mates' beliefs in tolerance.

!!Muruchi
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/muruchi.png]]

-->'''First Appearance:''' The Boy and the Monster Master
A fish-like monster that Alien Mates had been storing underground as an emergency weapon in case his hopes for building diplomacy with Earth went poorly. Unfortunately, Mates' worst fears were realized when an angry mob came to kill his adopted human son Ryo on the mistaken belief he was an evil alien. When Mates was killed in the ensuing riot, Muruchi to burst from the alien's spacecraft to rampage about like a living punishment for the villagers' hatred and prejudice.

Due to his debut being among the most acclaimed episodes in the entire franchise, Muruchi has made many more appearances in the ''Franchise/UltraSeries''. However, most of Muruchi's appearances since ''Series/UltramanMebius'' have renamed the monster Zoa Muruchi. This version of Muruchi is, for all intents and purposes, the exact same.

* AlasPoorVillain: [[spoiler:After Jack, destroys Muruchi with his Specium Ray, he has a brief moment of silence for the kaiju before leaving, evidently taking pity on the fact its rampage and eventual defeat would have never happened were it not for the awful circumstances of Mates' death.]]
* BattleInTheRain: Done with Jack in a long-take shot that also serves to enhance the tragedy behind the creature's rampage.
* BreakoutVillain: Due to the iconic nature of "The Boy and the Monster Master" among fans, Muruchi is one of Ultraman Jack's most iconic foes, hence his frequent reappearances.
* BreathWeapon: An energy beam that depending on the series is either red or blue.
* EarFins: Has two small fins in place of ears. The ear fins are more distinct in its future appearances as Zoa-Muruchi in ''Series/UltramanMebius'' and beyond.
* PetMonstrosity: To Alien Mates, though unlike most examples in the franchise, he never used it to conquer Earth. It was purely meant to be a bodyguard for if things went bad.
* {{Retcon}}: Muruchi was originally described as being an Earth kaiju that Mates had psychically imprisoned underground to protect Ryo when he first came to Earth, only to be freed upon his death. However, in later works like ''Series/UltramanMebius'', Muruchi's backstory is changed to being an alien kaiju that Mates had brought with him as a last resort and was awoken to rampage upon its master's death.
* RoaringRampageOfRevenge: It went on a rampage to punish humans for their racism and prejudice resulting in the death of Alien Mates.
* SeaMonster: Though he's only been seen underwater in ''Series/UltraGalaxyMegaMonsterBattle'', Muruchi's design is definitely supposed to be one. His BossSubtitles is even "Giant Fish Monster"
* WoobieDestroyerOfWorlds: Muruchi was not destroying its surroundings because of it was commanded to like most kaiju controlled by aliens, but instead to punish humanity for their hatred leading to Alien Mates' death. Goh even considers not transforming into Jack and letting the villagers reap their sins.

!!Leogon
[[quoteright:275:https://static.tvtropes.org/pmwiki/pub/images/leogon_ii.png]]

-->'''First Appearance:''' The Life That Can't Be Forgiven
A plant-animal hybrid created by Ichiro Mizuno, a brilliant biologist and childhood friend of Goh who became madly obsessed with the idea that the differences between plants and animals were irrelevant in the grand scheme of life and creating a lifeform that proved this. Unfortunately for Mizuno, his creation grows out of control within mere minutes of birth, escaping from his laboratory and making itself at home in Lake Ashi.

Although Leogon has never made any appearances since its debut, it is very notable for being the SpiritualPredecessor to the ''Franchise/{{Godzilla}}'' kaiju [[Film/GodzillaVsBiollante Biollante]]. Both kaiju were created by the same scriptwriter, a dentist named Shinichiro Kobayashi, who originally created Leogon and its story at 16 for a scriptwriting contest held by Creator/TsuburayaProductions. Nearly 20 years later, Kobayashi would write a very similar story that he then submitted for a different scriptwriting contest held by Creator/{{Toho}}, with the studio using it as the basis for ''Film/GodzillaVsBiollante''.

* AchillesHeel: Due to the fact Mizuno created Leogon using a unique electromagnetic wave called the Alpha Leon Magnetic Wave, Leogon is vulnerable to the Beta version of this wave. However, Mizuno is unable to bring himself to use the wave against his own creation and is subsequently killed as a result, forcing Goh to become Ultraman Jack.
* AnArmAndALeg: [[spoiler:Jack defeats Leogon by slicing off its front legs and the tubes on its back.]]
* MakeMyMonsterGrow: Grows from a mere two feet to over a hundred and fifty in a matter of hours, thanks to Mizuno's usage of the Alpha Leon Magnetic Wave to hatch the creature from its egg.
* {{Planimal}}: One specifically created through reptile and carnivorous plant DNA for the specific purpose of being this, invoking themes of science going too far, much like its [[invoked]]CreatorDrivenSuccessor, Biollante. To push the point further, Biollante's designer confirmed drawing cues from Leogon in designing her, with some concept art more closely resembling the Ultra kaiju. It even appears at Lake Ashi, just like Biollante does in her first fight with Godzilla!
* VineTentacles: Leogon can sprout two vines from the tubes on its back for grabbing and constricting foes.
* WhipItGood: The tubes on Leogon's back carry vines to use as whips or to wrap around enemies.

!!Priz-Ma
[[quoteright:275:https://static.tvtropes.org/pmwiki/pub/images/priz_ma_prof.jpg]]

-->'''First Appearance:''' Cruel Light Monster Priz-Ma!

A bizarre crystalline entity that only manifests at night to feed on light and light sources. Having been imprisoned in Antarctic ice for thousands of years, Priz-Ma was released from its icy tomb by an unusual pattern of sunspots, allowing it to make a beeline northward, where it absorbed every light-emitting object from its path and eluded MAT with its strange light-bending abilities.

* AchillesHeel: Extreme cold significantly weakens Priz-Ma and causes it to go dormant, with absolute zero being fatal to the creature.
* BlindedByTheLight: Priz-Ma releases several blinding flashes of light at Jack during their first face-off.
* CrystallineCreature: In a very unusual example, Priz-Ma only appears as one during nighttime. When the Sun goes down, Priz-Ma switches its diet from natural light to artificial light, forcing it to appear as the prism-like being seen above.
* EldritchAbomination: A giant living crystal prism that consumes light and light-producing matter and dissipates from thin air during the day.
* EnergyAbsorption: Its diet of light grants it this ability by nature. Notably, it can also convert light-producing objects like ships, lighthouses, or stadium lights into light energy by firing a ray at them, allowing Priz-Ma to then simply absorb the objects as well.
* EnergyBeing: Priz-Ma becomes one of these by day, vanishing in thin air once the Sun rises as it can simply just thrive on sunlight during the day.
* {{Expy}}: Of Bullton from the original ''Series/{{Ultraman}}''. Both are abstract monsters capable of messing up their surroundings via bizarre abilities that even leave an Ultra's head spinning.
* KillItThroughItsStomach: [[spoiler: How Jack ultimately defeats him, flying into its body and firing his Specium Ray, destroying it.]]
* LightEmUp: Being a prism-based monster, Priz-Ma is all about this. It feeds on light and is able to convert light-producing matter into additional light, while also becoming an EnergyBeing by day to absorb sunlight. It can even manipulate light to create illusions, blind opponents, and cause all sorts of trippiness.
* LightIsNotGood: Priz-Ma is a creature of light that feeds on and absorbs light while only being able to physically manifest at night from an aurora. However, its presence is deemed a threat to civilization by MAT, as its appetite for light results in any man-made object that produces light being absorbed into its mass. It even tries to absorb Ultraman Jack (who, as an Ultra, is a being of light) during their first match!
* MeaningfulName: Priz-Ma basically means "Prism-Demon" in Japanese.
* NoSell: Jack finds during his first confrontation with Priz-Ma that his punches and kicks have no effect on the crystal being, with Priz-Ma almost absorbing him into its body as a result!
* OminousFog: The aurora that appears prior to Priz-Ma's manifestations produces a fog that the entity then appears from.
* OurMonstersAreWeird: A giant light-eating prism that only appears at night and becomes an EnergyBeing by day... This is one of those Ultra monsters that can only be called a kaiju in the vaguest sense of the term.
* SealedEvilInACan: Had been imprisoned in Antarctic ice for countless millennia until strange patterns of sunspots allowed it to escape from its prison and go on the rampage.
* SpellMyNameWithAnS: Pri'''z'''-Ma or Pri'''s'''-Ma?
* TakenForGranite: Priz-Ma coats solid matter in the same crystal it is composed of, converting objects or living beings into light that it then absorbs.
* TimeMaster: Priz-Ma can even reverse time!
* WintryAuroralSky: Possibly as a nod to its Antarctic origins, Priz-Ma's manifestation is always foreshadowed by the appearance of an aurora.

!!Alien Carmilla Draculas
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/draculas_1.jpg]]

-->'''First Appearance:''' Rout the Night
-->'''Voiced by:''' Tetsuya Kaji
A vampire-like alien that intended to destroy humanity by eliminating Earth's women. In order to avoid Earth's larger amount of sunlight and MAT's notice, he possessed the corpse of the late Midori Suzumura, pretending to be the woman's long-lost sister Michiko to get close to the young women of the wealthy neighborhood Midori once lived in and then drinking their bodies dry of blood once night fell.

* BatOutOfHell: His true form.
* BreathWeapon: Two actually; the first is a blinding mist, and the second is red energy bolts.
* DeadPersonImpersonation: Draculas possesses the corpse of a deceased woman to avoid both exposure to sunlight in daytime and MAT's notice. Draculas gets around any suspicions about Midori's sudden return to her former neighborhood by claiming to be Midori's long-lost twin.
* EnergyAbsorption: Draculas' ability to drain the life force of others extends to Ultras, managing to set off Jack's Colour Timer prematurely after biting him down in the shoulders.
* EvilCannotComprehendGood: Is absolutely baffled that Jack would bother defending humans since he’s an alien.
* ImpaledWithExtremePrejudice: [[spoiler:Just like the legends, Jack kills Draculas with a stake to the heart.]]
* LongLostRelative: Draculas claims to be Midori's lost twin sister to her former friends and neighbors to reduce any suspicions they might have of someone who died 6 months ago suddenly returning.
* MeaningfulName: Obviously, he's named after Count {{Dracula}}, but his species name, Alien Carmilla, is derived from the title character of [[Literature/{{Carmilla}} a vampire novella]]. Like Carmilla, Draculas' Midori disguise was a young, attractive, wealthy woman who specialized in feeding on the blood of similar women.
* OurVampiresAreDifferent: First of all, he's a bat-like alien capable of possessing corpses to hide from sunlight. Second, he drinks life force rather than blood.
* ReducedToDust: [[spoiler:Once Draculas is killed, his body turns to ashes that are then blown away by the wind to reveal Midori's corpse underneath.
* SpellMyNameWithAnS: Sometimes also known as Draculus.
* VampiresAreRich: His human disguise was that of a young woman from a wealthy family, and he targeted other young women from wealthy families in the same community.
* WeakenedByTheLight: As a space vampire and all that. Not only is this the reason why Draculas is forced to possess the corpse of the late Midori, but Jack is able to disable him during their battle with a flash of light long enough to finish him off.
* WouldHitAGirl: His entire scheme was to wipe out Earth's women, and he begins with targeting the young beauties of a wealthy neighborhood.

!!Alien Nackle
[[quoteright:275:https://static.tvtropes.org/pmwiki/pub/images/alien_nackle_old.png]]

-->'''First Appearance:''' Ultraman Dies at Twilight
-->'''Voiced by:''' Masahiko Naruse (also human form actor)
A highly wicked and highly intelligent alien whose plans to defeat Ultraman Jack and subjugate Earth were like none before him. Understanding that Jack was the one thing standing between him and victory, he resurrected Bemstar and Seagorath to study Ultraman Jack's combat style and commanded Black King to distract MAT to he could acquire the powerful explosive chemical Saturn Z, all while hatching a plan to emotionally destroy Goh. The end result was the defeat of Ultraman Jack, placing the hero in his greatest crisis yet.

As the most dangerous of Ultraman Jack's foes, Alien Nackle has reappeared many times in the ''Franchise/UltraSeries'' and his debut two-parter remains one of the most highly praised episodes of the franchise. Alien Nackle has played many roles in his reappearances, but almost all of them are no less villainous than the original.

* ArcVillain: Of episodes 37 and 38 in ''Return of Ultraman''.
* BewareTheSillyOnes: Sure, Nackle may look a little silly (polka dot skin?), but make no mistake, he really is one of Jack's most dangerous enemies!
* BrainsAndBrawn: The Brains to Black King's Brawn, as Nackle doesn't have much to contribute in melee combat, while Black King is basically a mindless mass of muscle.
* BreakoutVillain: As the most iconic alien invader in ''Series/ReturnOfUltraman'', Nackle has reappeared numerous times against many other Ultra heroes.
* CurbStompBattle: Tag-teams with Black King to deliver one on Ultraman Jack. Jack returns the curb-stomping the next episode.
* DirtyCoward: He refuses to battle Ultraman Jack head-on until he has completely broken Goh's spirit and gained a complete advantage over the hero from it.
* DyingCurse: Lets out one when he's defeated and about to succumb.
--> '''Nackle''': You think you've won. But soon everywhere in Tokyo will explode. Mwa-hahahahaha! [''[[DieLaughing dies mid-gloating]]'']
* {{Expy}}: Of [[Series/UltraSeven Alien Guts]], as seen with his MonsterOfTheWeek plot, dangerous cunning, and crucifixion of Jack. Later instalments however have put them through a certain amount of DivergentCharacterEvolution, with Guts being more distinguished by his unique abilities when compared to Nackle.
* EyeBeams: Alien Nackle doesn't have a lot in the "flashy powers" department beyond these.
* GenreSavvy: Most alien invaders in the Ultra Series couldn't care less for the Ultra heroes' human companions, believing them to be too insignificant to be considered for their schemes, which subsequently screws them over when said humans give the Ultra the emotional and/or military support they need to win in the end. Nackle however understood that Goh's friends were in fact the hero's true weakness and subsequently made murdering them a priority.
* HandBlast: His only other special combat power is to shoot similar bolts of energy from his palms.
* HateSink: Despite being only the first incarnation of Nackle, he has the distinction of being the most sinister, irredeemable version of the alien thus far. He is manipulative, plays dirty by reviving past kaiju, kills two of Goh's closest friends, and spends most of the episode hiding until Black King has almost defeated Ultraman Jack. In fact, he is especially a DirtyCoward who relies on being manipulative and never getting his hands dirty unless he clearly has an advantage.
* {{Jerkass}}: He's as cruel, vile, and sadistic as they come.
* KickTheDog: [[spoiler:Kills Aki and Ken]] in order to emotionally destroy Goh, but it wouldn't be his last wicked deed.
* KnightOfCerebus: As the most dangerous villain of the series, Nackle's episodes were definitely not as lighthearted as the rest, and his defeat would spawn a slew of alien invasions in his wake.
* ManipulativeBastard: Sought to emotionally crush Goh by striking at his loved ones before fighting him.
* MindControl: Subjugates all of MAT san Oka by placing tiny radio tags on their necks that connect to a satellite dish that fires mind control waves.
* NeckSnap: [[spoiler:This is likely what caused Nackle's death, since Jack lifts him ''into the stratosphere'' before dropping Nackle, who then lands on his head.]]
* NoMouth: The glowing red thing beneath his eyes is the closest we get to one.
* SpellMyNameWithAnS: Also called Knackle, Knuckle, and Nuckle.
* WouldHitAGirl: Evidenced by his hands at the [[spoiler:murder of Aki.]]

!!Black King
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/ultrmn_glxy_lgnds_blck_kng.png]]

-->'''First Appearance:''' Ultraman Dies at Twilight
Alien Nackle's bodyguard monster that served as the muscle for Nackle's scheme in successfully taking Earth. Its incredible strength and heavily armoured skin proved to be nigh-unbeatable for Ultraman Jack and MAT, allowing Nackle to defeat the hero and then mind control most of MAT without breaking much of a sweat.

Although not as iconic as his counterparts Red King and Gomora, Black King is possibly an even more formidable opponent than either, making him an incredibly popular monster. Thus Black King has reappeared numerous times in the ''Franchise/UltraSeries'', starting with ''Film/MegaMonsterBattleUltraGalaxyLegends'', often alongside Nackle or some other alien invader.

* BrainsAndBrawn: The Brawn to Nackle's Brains, to the point where Nackle's incredible cunning and Black King's formidable strength effectively form a single frighteningly powerful opponent.
* BreakoutVillain: Like Alien Nackle, Black King is an incredibly popular monster for being one of Jack's most lethal foes. They're still frequently teamed up with each other in modern series.
* BreathWeapon: Breathes a beam of intense fire called Hell Magma. He's also seen breathing white smoke as a getaway cover.
* CurbStompBattle: Dishes one to Ultraman Jack, due to Jack having exhausted his strength battling the revived Seaagorath and Bemstar. Jack returns the favour an episode later.
* TheDragon: He's not merely a pet or a bioweapon for Nackle, like most giant monsters are to evil aliens in the Ultra Series. However, AllThereInTheManual sources claim the Nackle species mass-produce armies of Black Kings.
* DumbMuscle: Although incredibly strong, Black King's not terribly bright, hence the reason why he's often bossed around by an evil alien rather than seen as an independent monster.
* {{Expy}}: Of [[Series/{{Ultraman}} Gomora and Red King]]. All three are brutish dinosaur-like monsters that have immense strength and superb toughness. Like Gomora, he's also able to defeat an Ultraman, while like Red King, he's not very bright.
* TheJuggernaut: Almost nothing can scratch his flesh, and good luck even trying to surpass his strength.
* OffWithHisHead: [[spoiler:His fate.]]
* RedHerring: Nackle first uses Black King as such, having it attack MAT while they're in the middle of transporting a dangerous explosive chemical called Saturn Z so that he can steal it while MAT is focusing their firepower on the kaiju.
* SuperStrength: Do we really have to emphasize this again? This guy's like Red King on steroids.
* TunnelKing: Can move about underground to avoid notice.
* TheWorfEffect: So strong, so tough, and so powerful that Jack was unable to beat him at all the first time (though it also had a lot to do with how depressed Goh was about [[spoiler:the death of Ken and Aki]]).

!!Alien Varduck
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/alien_varduck_0.png]]

-->'''First Appearance:''' The 20th Century Yeti
-->'''Voiced by:''' Isao Yatsu
Following the defeat of Alien Nackle, Earth was confronted with a slew of extraterrestrial invaders, with the first being Varduck. Originating from an icy plant that passed through the Solar System every 240 years, Varduck had come to Japan during the Edo Period as a scout for his species and made his home on snowy Mt. Gongen, leading to legends of a yeti in the region. When an anthropologist named Hideo and his fiancee Yoko came to investigate these stories, Varduck killed the former and took control of his body, using it to prepare for the return of his planet and the arrival of his people's invasion force.

* BigfootSasquatchAndYeti: He became known to the villages around Mt. Gongen as a yeti and is speculated to even be the inspiration for the Abominable Snowman. His BossSubtitles is even "Abominable Snowman Alien". Despite all of that though, he looks absolutely nothing like one.
* BreathWeapon: Can breath freezing mist.
* DeadPersonImpersonation: In an odd variation of this trope, he takes control of Hideo's body after killing the man. Once his species' invasion fleet arrives however, he exits the body to turn giant and begin freezing up Earth. Interestingly, Hideo's body is still technically dead, as Goh notes his hands to be deathly cold when shaking hands with him. Additionally, [[spoiler:once Jack defeats Varduck, Hideo returns to life.]]
* AnIcePerson: Naturally, he hails from a very frigid planet and seeks to freeze up Earth for conquest.
* TheShadowKnows: He still casts his original alien shadow when disguised as a human.
* SpellMyNameWithAnS: Varduck or Bardak? It all depends on how you translate it.

!!Alien Black
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/alien_black_0.png]]

-->'''First Appearance:''' The Phantom Snow Woman
-->'''Voiced by:''' Hiroyuki Yuyama
Another invader from an arctic planet, this one seeking out slaves for his people. But whereas Varduck was a solo threat, Alien Black utilized the monster Snowgon in his scheme. The pair disguised themselves as an elderly cabin caretaker and his granddaughter, transforming any young newlywed couples who came to their place into human popsicles for easy abduction.

* AnIcePerson: Like Alien Varduck before him, Alien Black is an extraterrestrial invader from a frozen world. He's also stated to have some minor ice-based powers, but [[InformedAbility we never see them]].
* OhCrap: Has a slight freak out when he sees his monster destroyed. Jack then turned towards him, and you can guess what happened next.
* SlaveryIsASpecialKindOfEvil: His motivation for attacking Earth with Snowgon was to kidnap one thousand newylwed couples to make a slave population on his home planet.

!!Snowgon
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/snowgon2.jpg]]

-->'''First Appearance:''' The Phantom Snow Woman
-->'''Played by:''' Junko Arai (Yuki-onna form)
An icy monster used by Alien Black to freeze up humans for easy kidnapping as part of the invader's slave-making scheme. Snowgon disguised itself as a beautiful young woman with a strong resemblance to the mythic {{Yukionna}}, the granddaughter of Alien Black's human disguise, that of an elderly cabin caretaker. With this form, the monster went about using its freezing breath on newlywed couples under the orders of its master before eventually assuming its true form to fight Ultraman Jack.

* BreathWeapon: Breathes a very powerful, fast-working freezing mist.
* TheDragon: To Alien Black, disguising itself as his granddaughter when in human form.
* HandBlast: Snowgon can fire the same super-freezing mist from its hands.
* HeroKiller: [[spoiler:Albeit very briefly thanks to [[DeusExMachina the Ultra Bracelet suddenly reviving Jack]], starting a minor trend of insignificant one-episode deaths for Ultra heroes.]]
* HoistByHisOwnPetard: [[spoiler:Jack destroys Snowgon by reflecting its freezing breath back at it with the Ultra Bracelet]], which leads to...
** LiterallyShatteredLives: [[spoiler:Jack then pushes Snowgon over!]]
* AnIcePerson: Obviously. Just look at its name!
* MixAndMatchCritters: Resembles [[BigfootSasquatchAndYeti a yeti]] mixed with [[BearsAreBadNews a polar bear]] and [[OurDragonsAreDifferent a dragon]].
* SuperStrength: Strong enough to tear apart anybody iced up by its BreathWeapon into pieces.
* VoluntaryShapeshifting: Can transform into a {{Yukionna}}, though it can still use all its abilities.
* {{Yukionna}}: Inspired by the youkai. Its BossSubtitles is even "Yuki-onna Monster".

!!Alien Baltan Jr.

-->'''First Appearance:''' The Revenge of Alien Baltan Jr.
-->'''Voiced by:''' Osamu Saka
The son of [[Series/{{Ultraman}} the original Alien Baltan]], seeking vengeance for the death of his father at the hands of the original Series/{{Ultraman}}. To this end, Baltan Jr. established his lair in a building under construction, converting it into his robot monster Billgamo and trapping MAT, Jiro, and Jiro's friend Susumu inside his it.

See Characters/UltramanTVSeries

* ArtEvolution: Due to being a younger member of his species, Baltan Jr. is a golden brown in colour with a stouter appearance than the first and second Baltans from ''Series/{{Ultraman}}''.
* AvengingTheVillain: The son of the first Alien Baltan seen in the original ''Series/{{Ultraman}}''.
* CameFromTheSky: Jiro witnesses Baltan Jr. arriving to the construction site in the form of a comet.
* PhantomZone: Baltan Jr. creates a shadow dimension inside the walls of the construction site as part of his plan, allowing him to hide from MAT and disguise Billgamo. Notably, a puddle of red liquid disguised as spilled paint causes whoever steps on it to be sucked into said Phantom Zone, as is the fate of Jiro's friend Susumu and his pet dog Koro.
* VillainExitStageLeft: [[spoiler:After Ultraman Jack destroys Billgamo, Baltan Jr. pops out of his robot and swears vengeance before flying away. Jack fires a Specium Ray at the fleeing alien, but Baltan Jr. vanishes in a flash of light just before the beam can hit.]]
* WeWillMeetAgain: [[spoiler:After Billgamo is destroyed, Baltan Jr. tells this to Jack before leaving.]]

!!Billgamo
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/builgamo.jpg]]

-->'''First Appearance:''' The Revenge of Alien Baltan Jr.
A giant robot that Baltan Jr. used as his monster weapon. Baltan Jr. built Billgamo from a building that was under construction, luring MAT and Jiro into said structure before piloting the mechanical monster himself to demolish Tokyo. But with his friends and teammates trapped inside Billgamo, Ultraman Jack found himself unable to properly defend Japan from the threat of Baltan Jr.

* AnArmAndALeg: [[spoiler:Once MAT and Jiro escape from Billgamo, Jack defeats the robot by slicing off its limbs, allowing him to them blow up the helpless body.]]
* BlindedByTheLight: Billgamo can fire blinding flashes of explosive or stunning light from its hands and antenna.
* CombiningMecha: Billgamo's torso is the building Baltan Jr. created the robot from, with the robot's limbs and head flying in to combine with the building and create Billgamo.
* DeathRay: Fire one from the antenna on its forehead that is powerful enough to create massive explosions and even set Jack's leg on fire!
* HumongousMecha: A giant robot constructed from a building and piloted by Baltan Jr. to defeat Ultraman Jack.
* IHaveYourWife: Since Billgamo is literally made from a building used by Baltan Jr. for his scheme, he is able to trap MAT and Jiro inside of Billgamo's torso. As a result, Jack runs the risk of killing his friends and loved ones if he destroys Billgamo.
* SpellMyNameWithAnS: There are one or two L's and/or M's depending on who you ask. Additionally, some may spell its name as Bilagammo or Builgamo.
* TinCanRobot: A very boxy design inspired by ''Series/UltraSeven'''s Crazygon.

!!Alien Stora
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/alien_stora.jpg]]

-->'''First Appearance:''' The Monster That Stands on Mt. Fuji
-->'''Voiced by:''' Osamu Saka
Yet another intergalactic invader, Stora used the illusionist monster Paragon to wreak havoc in the highways and villages around Mt. Fuji, as well as confuse MAT and Ultraman Jack, as part of a scheme to clear humanity out of Earth and make way for a resort planet for his species.

* FightingAShadow: Much like Paragon, Stora does not directly confront MAT for most of the episode, instead speaking to them by using an illusory doppelganger of himself created through his light-manipulating powers.
* MasterOfIllusion: Stora possesses the same light-bending powers as Paragon, allowing him to project an image of himself to taunt MAT while the real alien remains hidden from them.
* PleasurePlanet: His plan was to turn Earth into one of these for his species, which first meant getting rid of the natives.
* SmugSnake: Throughout the episode, he mocks MAT over their inability to stop his monster but otherwise does very little on his own.
* {{Synchronization}}: [[spoiler:Stora bursts into flames and dies after Jack kills Paragon by tossing the monster into Mt. Fuji's lava-filled crater, suggesting this to be the case.]]

!!Paragon
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/paragon_0.png]]

-->'''First Appearance:''' The Monster That Stands on Mt. Fuji
Alien Stora's tool for world domination. Paragon is a bizarre monster with the power to manipulate waves and rays, including those of the Sun, which in turn grant it potent illusory abilities. Stora placed the creature on the peak of Mt. Fuji, where it appeared on sunny days under a coverage of clouds to bend light and cause hallucinations and other tricks of the eye that led to all kinds of accidents in the villages and highways below.

* AchillesHeel: Because Paragon's abilities require sunlight to work, the monster is powerless at nighttime, which is demonstrated by how its enormous illusory self-projection vanishes completely once the sun sets.
* AimForTheHorn: Jack breaks off it's tusks in the final battle. One at a time.
* BarrierWarrior: Paragon is able to generate a force field in front of itself at will.
* BlowYouAway: The weird wing-shaped projections on its shoulders can be flapped to create powerful winds.
* DisneyVillainDeath: [[spoiler:Ultraman Jack sends Paragon tumbling into lava by blowing up the cliff it's standing on.]]
* EarAche: At the peak of the battle, Ultraman Jack rips off both of Paragon's ear-like organs. Those organs are seemingly the source of Paragon's powers, hence after that the monster is easy picking for the Ultra.
* FightingAShadow: Paragon's hallucinatory abilities allow it to project a massive image of itself that conceals the real deal, as it does for most of the episode.
* KillItWithFire: [[spoiler:Ultraman Jack defeats Paragon by knocking it into Mt. Fuji's lava-filled with crater, incinerating the monster.]]
* LightEmUp: Paragon's illusion powers are reliant entirely on sunlight. However, its ability to manipulate light extends to all other forms of electromagnetic waves, allowing it to conceal its location from MAT's radars.
* MasterOfIllusion: Probably one of the most powerful illusion-based opponents of the Ultra heroes. Paragon manipulates electromagnetic waves, such as sunlight and radar, to fool MAT into attacking villages and each other, cause cars to crash into each other, create duplicates of itself, and even make itself seem as big as Mt. Fuji.
* AMoltenDateWithDeath: [[spoiler: It was killed when Jack blows up the platform it's on, causing Paragon to fall backwards into a lake of lava]].
* PetMonstrosity: Of Alien Stora.
* ShockAndAwe: Able to fire an electrifying bolt of energy from the glowing orb thingy above its shoulders.
* TeleportSpam: Which it uses to frustrate Ultraman Jack even further.

!!Alien Grotes
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/alien_grotes_1.png]]

-->'''First Appearance:''' Demon God Barks at the Moon
-->'''Voiced by:''' Kentaro Kaji
A wicked alien whose attempt at world domination involved Grotescell, a substance that turns inanimate objects into giant monsters. Disguising himself as a local woodcutter, he stole a statue of a warrior-god from Hasune Shrine in the village Captain Ibuki's wife was born, transforming it into the monster Kodaigon and then holding Captain Ibuki's wife Yoko and daughter Minako hostage.

* AppliedPhlebotinum: His weapon of choice: the Grotescells, which are portrayed as a semi-vaporous chemical that enters hollow objects in order to bring them to life and transform them into kaiju. Killing Grotes is the only way to end turn the objects back to normal.
* DirtyCoward: Rather than participating in the battle against Ultraman Jack, Grotes chooses to hide behind Kodaigon and let it do all the fighting for him.
* HalfTheManHeUsedToBe: [[spoiler:His fate.]]
* IHaveYourWife: He kidnaps Captain Ibuki's wife and daughter, threatening to kill them if MAT does not disband itself and destroy its own headquarters.
* UnableToCry: More of an InformedAttribute (as it's not displayed onscreen), but when taking Ibuki's family hostage, Grotes mentioned that his race is unable to cry.
* WouldHurtAChild: Kidnaps Captain Ibuki’s family, including his daughter Minako, and is fully ready to kill them if MAT doesn’t surrender.

!!Kodaigon
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/kodaigon_0.png]]

-->'''First Appearance:''' Demon God Barks at the Moon
A statue of a warrior-god worshiped by the people in the village near Lake Hasune in Shinshu, said in legend to cross the frozen lake every winter (with the sound of cracking ice being attributed to his footsteps). The nefarious extraterrestrial invader Grotes stole the statue and transformed it into a kaiju with his Grotescell substance, using the monster to terrorize the very village it was supposed to protect.

A second Kodaigon called Kodaigon The Other appeared in ''Series/UltramanMebius'', animated by some leftover Grotescell entering a completely different statue, this one of the god Ebisu. But aside from name and origins, it has little in common with the original Kodaigon.

* {{Expy}}: Of Film/{{Daimajin}}, another samurai-deity-golem kaiju. Kodaigon's BossSubtitles is even "Majin Monster".
* {{Golem}}: Something like that.
* HumanShield: Grotes uses Kodaigon as one when MAT attacks the two of them and when they fight Ultraman Jack.
* TheJuggernaut: Most attacks completely bounce off of Kodaigon's body, so the only way to turn the monster back into a statue is to kill Grotes.
* LivingStatue: Used to be a samurai statue until it was injected by Grotecells, turning it into a sentient monster.
* MightyGlacier: Being a statue, Kodaigon moves at a lumbering pace, but Ultraman Jack finds it completely impossible to not only stop the monster from lurching forward but also break through its stone body with any of his attacks.
* NoSell: Jack's punches, kicks, and karate chops have no effect on Kodaigon.
* PlayingWithFire: Kodaigon is able to place its hands together in order to shoot out jets of flame from them.
* {{Samurai}}: Certainly resembles the part, complete with a sword that it can materialize out of thin air for combat. The villagers also consider it their home's guardian deity.
* {{Synchronization}}: Kodaigon's life force is entirely connected to Grotes, so killing the latter causes the former to revert back into a statue.
* WarGod: A statue of one such deity, although not based on any actual Japanese gods.

!!Alien Centaurus Akane Hirota
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/centaurus.jpg]]

-->'''First Appearance:''' To the Starry Sky with Love
-->'''voiced by:''' Yukiko Inoue (also human form actor)
An extraterrestrial agent sent by her superiors to sabotage MAT's latest project, the Ultra Long Range Radar. Alien Centaurus had come to Earth with all the typical malevolence displayed by alien invaders, but on the planet, she found herself enchanted by humanity and quickly defected. Enraged by her betrayal, her superiors sent the monster Granadas to kill her, but she ended up being rescued by Kishida (the inventor of the very device she was sent to destroy), with the two consequently falling in love with each other.

* HeelFaceTurn: She originally came to Earth to help her people invade the planet, but she came to love humanity and thus defected, leading to her subsequent romance with Kishida and the appearance of the monster Granadas.
* HeroicSacrifice: [[spoiler:Blows herself up alongside Granadas to defeat the monster for Ultraman Jack.]]
* InterspeciesRomance: She dates Kishida while disguised as a human.
* LoveRedeems: She came to Earth as just yet another evil alien invader, but her love for humanity and later Kishida swayed her to protect humanity from her people, culminating in her HeroicSacrifice.
* StarCrossedLovers: Centaurus is fully aware of the irony of her falling in love with the man who created the very device she was sent to destroy, and understands that this, along with the threat of Granadas, means their love is simply not meant to be. This is in part what drives her to perform her HeroicSacrifice.
* TakingYouWithMe: [[spoiler:She does this to Granadas by throwing herself with the monster off a cliff where they are both destroyed in a massive explosion caused by Centaurus.]]
* ThisWasItsTrueForm: In a slight variation, she only assumes her true form just before performing her HeroicSacrifice, with her otherwise appearing in her human disguise throughout the whole episode.

!!Granadas
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/granadas_0.png]]

-->'''First Appearance:''' To the Starry Sky with Love
A monster sent to Earth by Alien Centaurus' superiors as punishment for her defection to humanity shortly after her arrival. The creature was initially encountered by Goh and Kishida attacking Centaurus in her car, with the latter rescuing the disguised alien woman and subsequently falling in love with her. But Centaurus knew all too well that the threat of Granadas and her original mission doomed their romance from the start.

* BladeBelowTheShoulder: Possesses scythe-like blades in place of its hands and feet.
* BreathWeapon: Spits explosive sparks.
* DisneyVillainDeath: [[spoiler:Centaurus throws herself with Granadas off a cliff, where a fiery explosion caused by the alien destroys both at the bottom.]]
* EyeBeams: Granadas can shoot bolts of light from its eyes that burst into blue flames upon impact.
* EyeScream: Kishida manages to blind Granadas in one of its eyes during MAT's first confrontation with the kaiju. However, this doesn't really impact Granadas seriously, as its still able to put up a strong fight against Ultraman Jack and fire its EyeBeams.
* GlowingEyesOfDoom: When Goh and Kishida first meet Granadas, all they see are a pair of fiery blue orbs that later turn out to be the kaiju's eyes.
* HitodamaLight: When Goh sees the kaiju's GlowingEyesOfDoom and informs his teammates about them, they dismiss what he saw as just those, even pointing out that the TechnicolorFire they saw at the site is no different than those created by Hitodama Lights.
* OverlyLongTongue: Lashes out at Kishida with one of these during MAT's first battle with it.
* TechnicolorFire: Due to the phosphorescent properties of its EyeBeams, Granadas creates lots of blue fire when it causes destruction.
* YouHaveFailedMe: Granadas was sent to Earth by Centaurus' superiors for this reason. Since she betrayed her people to protect humans, Granadas was sent to kill her and finish her job. Goh and Kishida actually first encounter Granadas and Centaurus while the former is trying to kill the latter.

!!Alien Cygnus-61 Erika Shiratori
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/erika.png]]

-->'''First Appearance:''' Assassinate Hideki Goh!
-->'''Played by:''' Junko Kawasaki
A young alien girl kidnapped by the wicked Alien Messie, who also murdered her father in the process. Using a special headband, Messie mind controlled Erika using a special headband and sent her to assassinate Goh after he had been injured by his battle against Robonez. To this end, Erika was sent to plant explosives in key locations and befriend Jiro to get closer to Goh and his location.

* CreepyChild: A mind-controlled little girl in white sent to murder a grown man. That is pretty creepy. However, she does befriend Jiro and turns out to be quite friendly once her mind-controlling headband is removed.
* HumanAliens: Or at the very least, we never see what she really looks like.
* InnocentAliens: Once freed from her headband, Erika reveals herself to be little more than a scared, confused child who just wants to be with her parents again.
* RingOfPower: When Goh and Jiro confront Erika following her assassination efforts, Erika fends them off using a ring that unleashes a ray of energy at them.
* TimeBomb: Uses these to try and assassinate Goh, disguising them as pens that she gives to people who she knows Goh will be around, such as Jiro.

!!Robonez
[[quoteright:275:https://static.tvtropes.org/pmwiki/pub/images/robonez.png]]

-->'''First Appearance:''' Assassinate Hideki Goh!
A rat-like monster sent by the evil alien Messie to battle MAT and Ultraman Jack. Although it was quickly destroyed, Robonez was able to injure Jack's arm with its bite. The resultant infection (no different than that from a rat bite) forced Goh to take some time off to recuperate, leaving him an easy target for Erika's assassination attempts as commanded by Messie.

* BreathWeapon: Breathes fire.
* MeaningfulName: Combination of "Robot" (see RoboticReveal) and "Nezumi" (the Japanese word for ""rat").
* PrehensileTail: Uses its tail to ensnare Jack and knock him over.
* RoboticReveal: Its skeleton turns out to be mechanical when Jack kills it, suggesting Robonez was an artificial creature and not merely a mutant rat.
* RodentsOfUnusualSize: It's a 35-meter tall rat kaiju!
* StrippedToTheBone: Jack destroys the monster in this manner with the Ultra Bracelet. Incidentally, the only other monster in the show killed this way, Kingstron, had its suit modified to create the Robonez costume.
* YouDirtyRat: A rat-based kaiju with a disease-ridden bite, although unusually it possesses a mechanical skeleton and has an armoured shell on its back resembling that of Kingstron (whose suit Robonez was made from).

!!Alien Messie
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/alien_messie_0.png]]

-->'''First Appearance:''' Assassinate Hideki Goh!
-->'''Voiced by:''' Isao Yatsu
Yet another malevolent alien invader, Messie kidnapped Erika from her family and murdered her father as part of his scheme to kill Ultraman Jack. Mind controlling the young alien and Goh's doctor with special headbands, he sent the monster Robonez after Ultraman Jack to injure Goh, leaving the incapacitated hero vulnerable to the assassination attempts to Erika and efforts by Goh's doctor to secretly poison him.

* KickTheDog: Mind controlling an innocent little alien girl is one thing, but did he really have to kill her father as well?!
* LittleGreenMen: His true form, although he's not really little once he turns giant-sized to battle Ultraman Jack himself.
* TheManBehindTheMan: Messie remains hidden for most of the episode, relying entirely on his mind-controlled minions to do his bidding. Once it seems like he has dealt with Goh for good, he reveals himself and begins demolishing his surroundings in giant form.
* MindControl: He controls Erika and Goh's doctor with special headbands. Destroying the headbands proves futile, as Messie is simply able to recreate them as needed. [[spoiler:Naturally, it turns out killing Messie ends the problem permanently.]]
* MyBrainIsBig: His bulbous forehead, which can also fire laser beams.

!!Alien Zoole
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/alien_zoole.png]]

-->'''First Appearance:''' This One Blow Filled With Anger
-->'''Played by:''' Takara Masayoshi (human form of agent), Isao Yatsu (voice of superior)
A slimy invader who came to Earth disguised as a friendly [[https://en.wikipedia.org/wiki/Kamishibai kamishibai]] artist. Zoole enchanted children with his stories of MAT's battles against a monster of his own imagination called Red Killer, but when no one was watching, he beat up a boy named Toru and threw his battered body in front of Goh's car, framing him for hitting the kid with his car and getting Goh temporarily suspended while he unleashed the real Red Killer on Tokyo without opposition.

* BitchInSheepsClothing: He disguises himself as a friendly old artist and pretends to bond with a bunch of kids, and then when no one's looking, he beats up and injures a boy and frames Goh for it.
* ThisWasHisTrueForm: In an odd variation, we see what his species look like when he communicates with his superiors through a device disguised as a kamishibai box, but he only appears in this form when MAT kills him.
* WouldHurtAChild: He beats up a kid and throws the boy's body in front of the MAT patrol vehicle to make it seem like Goh ran over the child. Later on, he summons Red Killer to destroy the hospital the kid is in to ensure he can't tell MAT what really happened.

!!Red Killer
[[quoteright:275:https://static.tvtropes.org/pmwiki/pub/images/red_killer.JPG]]

-->'''First Appearance:''' This One Blow Filled With Anger
Alien Zoole's monster of choice in his scheme to conquer Earth and defeat Ultraman Jack. Red Killer was sent out to rampage while Goh was suspended from duty for allegedly running over a child with the MAT patrol car (actually the work of Zoole).

* BattleBoomerang: Its weapons of choice, which are equipped in place of hands. They can be thrown over several city blocks and can slice through a skyscraper effortlessly.
* BreathWeapon: Breathes an explosive white gas.
* HalfTheManHeUsedToBe: [[spoiler:Immediately after getting decapitated, Red Killer's headless body splits apart.]]
* HoistByHisOwnPetard: [[spoiler:Jack defeats Red Killer by grabbing the monster's boomerangs and using them to slice off its head.]]
* NamesToRunAwayFromReallyFast: Red Killer sounds an awful lot like what someone would call a notorious communist assassin, no?
* OffWithHisHead: [[spoiler:Its fate.]]
* PetMonstrosity: To Alien Zoole.

!!Femigon
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/femigoon_ii.png]]

-->'''First Appearance:''' The Targeted Woman
The first monster in a long while to not be associated with alien invaders in any way, Femigon is a fiery spirit-like entity that feeds on flames. The creature possessed Oka, causing her to experience sudden bouts of exhaustion and causing her to become a rooster-like kaiju at the entity's will. The monster targeted oil rigs, overwhelming MAT, who had been reduced solely to Captain Ibuki, Kishida, and Ueno after Goh and Minami were presumed lost at sea following an accident that led to Oka's temporary dismissal.

Femigon also appeared in ''Series/UltramanMebius'', but unlike most returning monsters in that series, hasn't made any other appearances since.
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* BreathWeapon: Breathes fire.
* DemonicPossession: Femigon's primary gimmick is that it possesses human women, forcing them to transform into Femigon whenever the entity wills it.
* EnergyAbsorption: Femigon consumes fire for sustenance, causing destruction in its chicken monster form to create its food source.
* EnergyBeing: Femigon's natural form is a wisp-like creature made of fire, only becoming the chicken monster by possessing human women.
* EyeBeams: Femigon can shoot darts of fiery red energy from its eyes.
* FeatheredFiend: Femigon's kaiju form is a chicken-based creature. Its roar is even just the modified crowing of a rooster.
* HitodamaLight: Inspired by these. Its BossSubtitles is even "Hitodama Monster".
* InvoluntaryShapeshifting: Those possessed by Femigon will be able to transform into the creature's kaiju form, albeit without any control over the transformations.
* OutsideContextProblem: After a long slew of alien invaders, Femigon breaks the mould by being little more than a simple rampaging kaiju without any extraterrestrial mastermind behind its appearance.
* PlayingWithFire: It's made of fire, it consumes fire, it breathes fire, and it grants those it possesses pyrokinesis.
* PowersViaPossession: Women possessed by Femigon gain the ability to set things on fire with their mind.
* VillainExitStageLeft: [[spoiler:After Jack manages to separate Oka from Femigon with his Ultra Bracelet, Femigon is last seen fleeing Oka's body in its spirit form, never to be seen again.]]

!!Yametaranse
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/yametaranese_new.png]]

-->'''First Appearance:''' I'm Taking the Earth!
A harmless creature that carries within its body a contagion that causes extreme laziness in anyone who comes in contact with it or infected individuals. Yametaranse was deposited onto Earth by the evil alien Sasahillar, where a lazy classmate of Jiro named Masaru found it. Unaware of the creature's nature, Masaru soon ended up causing a citywide pandemic of apathy across Tokyo, with even Ultraman Jack losing the willpower to fight!
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* BigEater: Yametaranse loves to eat and spends his time simply just munching on any edible goodies he can find, such as trees when kaiju-sized.
* GentleGiant: Although Yametaranse does cause trouble when kaiju-sized (entirely due to its appetite and clumsiness), the creature does not seek to harm anyone and actively tries to warn others of the danger it poses. If anything, its quite evident Yametaranse was serving Sasahillar against its will. So Ultraman Jack simply defeats the monster by throwing it into space.
* HiccupHijinks: People infected by Yamentaranse's laziness develops the hiccups, as well as black spots on their face.
* TheKlutz: Yametaranse does destroy a few buildings when kaiju-sized, but entirely due to its own clumsiness than any malicious intent.
* LazyBum: To such levels that it affects others with it. Already lazy people like Masaru become more energetic instead, but they also spread the monster's highly contagious laziness. Fortunately, sheer willpower can overcome the effect.
* MakeMyMonsterGrow: As more and more people are infected by Yametaranse's laziness, the monster grows and grows, eventually achieving kaiju size.
* MeaningfulName: Its name comes from "yameta", which means "to quit" in Japanese, as that's what its extreme laziness causes everyone in Tokyo to do.
* OurMonstersAreWeird: A muppet-like creature with no visible feet that causes laziness... Definitely one of the goofier creatures in the show, but the episode it appears in is appropriately comedic.
* {{Telepathy}}: Yametaranse is able to communicate with Goh through this, allowing it to explain its plight to Ultraman Jack and help the hero realize the only way to defeat it is by taking it off-planet.

!!Sasahillar
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/sasahiller.jpg]]

-->'''First Appearance:''' I'm Taking the Earth!
-->'''Voiced by:''' Isao Yatsu
An alien invader whose evil scheme was to place Yametaranse on Earth and use its laziness-inducing abilities to make the human race so slothful and apathetic that he would be able to take Earth with absolutely no opposition. But when Ultraman Jack was able to get rid of Yametaranse, Sasahillar was forced to step in and take matters into his own hands.
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* BreathWeapon: Sasahillar can breathe an explosive yellow gas from his mouth.
* ImMelting: [[spoiler:Dissolves into a green foam after getting hit by Ultraman Jack's Specium Ray.]]
* SpellMyNameWithAnS: Sasahill'''a'''r or Sasahill'''e'''r?
* StarfishAliens: Although played by a man in a rubber suit, the best way to describe his design would be something akin to a bipedal manta ray.

!!Alien Mystellar
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/mysteller.png]]
[[caption-width-right:300:Left: The Good Brother\\
Right: The Evil Brother]]

-->'''First Appearance:''' Space Warriors - Your Name is MAT
-->'''Voiced by:''' Fujio Murakami (good; also human form actor), Hironori Morimoto (evil; also human form actor)
A pair of alien brothers whose species have been at war with the unseen Alien Ateria for years. One of the two brothers, known among his people as the Ace of the Space Attack Squadron, grew sick of the war and fled to Earth with his daughter Terumi to live amongst humans. His sibling however, a captain in the squadron, came to Earth in search of conscripts in the form of MAT and Ultraman Jack, forcibly dragging his brother and niece back into the very conflict they wanted nothing to do with anymore.
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* ArchEnemy: Of the Alien Ateria, whom they've been waging war with for over 30 years. However, the Ateria are never ever seen, nor do they ever interact with the characters in any way, so they really just serve as an excuse for the brothers to come to Earth.
* BreathWeapon: The Mystellars are able to spit organic missiles from their trunk-like mouths.
* CainAndAbel: The brothers are usually identified as the "Good" one and the "Evil" one. To elaborate, the Good Brother had come to Earth because he wanted to find a planet far away from the conflict that his homeworld had experienced for far too long and intended to simply live amongst the humans in peace, but the Evil Brother solely wanted to continue waging war and was perfectly willing to enslave Ultraman Jack and blackmail his own sibling with the life of his niece if it would help.
* HateSink: The Evil Brother quickly falls into this trope the moment he threatens to harm his own niece to force his brother into helping him capture Ultraman Jack, tries doing the same to Jiro, brutally injures his own lawful brother, manipulates MAT into attacking Ultraman Jack, and then flees like a coward the moment Jack releases MAT from his mind control and he realize the battle is no longer in his favour. [[spoiler:Thankfully, he didn't make it far when MAT blasts his spaceship out of the air.]]
* IHaveYourWife: The Evil Brother has the mind-controlled MAT kidnap Terumi to blackmail the Good Brother into helping him capture Ultraman Jack, with the Good Brother choosing to lure out Goh by then capturing Jiro and Rumiko to force Jack to battle him.
* AnIcePerson: Both Mystellars are able to create freezing beams that encase their victims in ice, with the Good Brother using it to
* MindControl: The Evil Brother does this to MAT to make them attack Ultraman Jack when he refuses to join their cause, as well as capture his niece Terumi to blackmail his brother.
* MySpeciesDothProtestTooMuch: Goh recognizes the Good Brother's species and is surprised to learn that he has chosen to live on Earth in peace and away from the war, remarking that the Mystellar species has a reputation for being a race of bloodthirsty warriors.
* PapaWolf: The Good Brother has a daughter with him on Earth. And while he makes it clear to Goh he loves humanity, the value places on Terumi's life is so great that he is willing to sacrifice Jiro and Rumiko to save her from his Evil Brother.
* RedIsViolent: Played straight for the Evil Brother, whose body is entirely red, compared to the Good Brother who is red and grey.
* SpellMyNameWithAnS: Mystellar or Mysteler?
* VillainExitStageLeft: [[spoiler:Attempted by the Evil Brother. The moment MAT is released from his MindControl, he promptly bails on his own spaceship. MAT, however, shoots him out of the air before he can escape completely.]]

!!King Bockle
[[quoteright:200:https://static.tvtropes.org/pmwiki/pub/images/ultrmn_jck_kng_bckl_ii.png]]

-->'''First Appearance:''' Invitation from Hell
A bizarre subterranean humanoid who relies on antennae to sense his surroundings. King Bockle plotted to invade the surface world, but unexpectedly ended up becoming the subject of research for Ueno's mentor, the brilliant geologist Professor Koizumi. Knowing the scientist was a threat to his plans, King Bockle assassinated the man and destroyed his research facility before then targeting his daughter Chidori, forcing MAT to step in and protect lovely young lady from King Bockle's machinations.
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* AchillesHeel: As King Bockle's antennae provide both his powers and his senses, destroying them renders him completely helpless.
* BeneathTheEarth: King Bockle originates from thirty kilometers below the surface.
* DishingOutDirt: King Bockle is able to create earthquakes, landslides, quicksand, sinkholes and other earth-based hazards by channeling certain waves or frequencies through his antennae.
* MindControl: The antennae on King Bockle's forehead allow him to manipulate all sorts of waves and frequencies, which he can use to mind control humans.
* NonIndicativeName: Despite what the name suggests, King Bockle is never indicated to be the monarch of an entire species of subterranean beings and is instead treated as a singular entity.
* OurMonstersAreWeird: A green-skinned subterranean humanoid who has a white featureless head with two black slits for eyes, as well as two antennae growing from his shoulders. This guy easily has to rank among the weirdest-looking monsters in the Ultra Series.
* OutsideContextProblem: King Bockle stands out as one of only two threats in the final quarter of the series to have nothing to do with alien invaders.
* PoisonousPerson: King Bockle can create a spray of toxic red gas. It's implied he used this ability to kill Professor Koizumi.
* YouKnowTooMuch: His motivation for assassinating Professor Koizumi and attempting the same thing on his daughter.

!!Alien Bat
[[quoteright:240:https://static.tvtropes.org/pmwiki/pub/images/batt.png]]

-->'''First Appearance:''' The Five Ultra Pledges
-->'''Voiced by:''' Osamu Saka
The final extraterrestrial of the series to try their hand at taking over Earth. Bat's plan was known as the Ultraman Annihilation Project, sending his army for a direct assault of the Land of Light while he came to Earth to deal with Ultraman Jack himself. To this end, he kidnapped Jiro and Rumiko to lure out Goh, and when the hero came to confront the wicked invader, he revealed to Ultraman Jack that he had resurrected the infamous Zetton in hopes that the monster's dread reputation amongst the inhabitants of the Land of Light would intimidate Ultraman Jack into surrendering without a fight.

Alien Bat made a significant return in the ''Franchise/UltramanZero'' movies and specials as one of Zero's chief enemies. For these appearances, he received a drastic redesign, and was changed to an OmnicidalManiac who seeks to destroy the multiverse. However, he still maintains his habit of resurrecting the ''Franchise/UltraSeries''' most infamous kaiju to do his bidding.
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* BreakoutVillain: Although he's not quite as popular or frequently appearing as his fellow infamously ruthless alien foe of Jack, Alien Nackle, and is generally more of Franchise/UltramanZero's enemy these days, Alien Bat has still achieved this status to some extent.
* GalacticConqueror: Commands a massive alien force that he sends to attack M78 while he deals with Ultraman Jack on Earth, [[spoiler:forcing Goh to leave Earth forever so he can help his fellow Ultras fend off the invasion force.]]
* HandBlast: Can fire laser bolts from his claws.
* IHaveYourWife: He captures Jiro and Rumiko in order to lure Goh out and reveal his revived Zetton to Ultraman Jack.
* ImpaledWithExtremePrejudice: [[spoiler:Ultraman Jack does it to him in the same manner that he did to Draculas earlier.]]
* KickTheDog: He tries to weaken Goh for the battle against Zetton by kidnapping Jiro and Rumiko, as well as tormenting him with nightmares of being killed by Zetton.
* MeaningfulName: Bat sports large fangs and wing membranes underneath his arms, giving him a certain resemblance to an actual bat.
* {{Necromancer}}: He has a habit of reviving monsters to do the fighting for him, especially powerful ones like [[Series/{{Ultraman}} Zetton, Red King,]] [[Series/UltramanNexus Galberos,]] [[Series/UltramanGaia Gan Q,]] and [[Series/ReturnOfUltraman Bemstar]]. Justified as he doesn't have much to give out when it comes to straightforward the combat against the Ultras.

!!Zetton

[[quoteright:283:https://static.tvtropes.org/pmwiki/pub/images/zetton_3f.png]]
[[caption-width-right:283:This is what happens when Zetton skips leg day.]]

-->'''First Appearance:''' The Five Ultra Pledges
The original Zetton from ''Series/{{Ultraman}}'' resurrected by Alien Bat. The invader knew that the kaiju had become an object of great fear amongst the Ultras of Nebula M78 for having defeated the original Ultraman and sought to use that terror to intimidate Ultraman Jack. After luring Goh out by kidnapping Jiro and Rumiko, Bat revealed the monster to the hero as his army headed for the Land of Light, placing Ultraman Jack and MAT in a struggle to save Jiro, Rumiko, Earth, and M78!
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The final extraterrestrial of the series to try their hand at taking over Earth. Alien Bat's plan was to resurrect the infamous Zetton and use its dread reputation amongst the inhabitants of the Land of Light to intimidate Ultraman Jack into surrendering without a fight. Bat is a member of his planet's Federal Army, which rose to prominence following a civil war and were initiating a plan to invade the Land of Light for its Life Solidification Device, a device invented by [[Series/UltramanMebius Ultraman Hikari]] that could bring Ultras back to life. Furious that the Ultras would seemingly keep such revolutionary technology to themselves, the Federal Army codenamed their proposed invasion as the 'Ultra Annihilation Project', with the Bat and Zetton that Jack fought being merely the vanguard of the much larger military operation. After the two were defeated, Jack made his return to the Land of Light to fight alongside his comrades, with the Ultras ultimately emerging victorious.

The original Zetton from ''Series/{{Ultraman}}'' resurrected by Alien Bat, as the invader knew that the monster had become an object of great fear amongst the Ultras for having defeated the original Ultraman and sought to use that terror to intimidate Ultraman Jack.