For characters from the film, see ''Characters/Godzilla1998''.
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[[foldercontrol]]

!!H.E.A.T.
[[folder:Godzilla]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/GodzillaTheSeriesPerch.jpg]]
[[caption-width-right:350:He's [[TookALevelInBadass awesome again!!]]]]
[[caption-width-right:300:[[labelnote:Click here to see him as a hatchling]]https://static.tvtropes.org/pmwiki/pub/images/hatchlig_jr_8.png[[/labelnote]]]]

-> '''Voiced By:''' Creator/FrankWelker

Star of the animated series derived from [=TriStar's=] ''Godzilla'', Godzilla hatched from the sole surviving egg laid by the first Zilla.
----
* AdaptationDyeJob: His Atomic Breath is radium green rather than traditional Cherenkov blue.
* AdaptationalNameChange: His Atomic Breath is called "Power Breath" within the show. Creator/{{Toho}} inverts it, and calls it "Heat Ray" in their official Platform/YouTube channel (it's an inversion because Toho has always called the BreathWeapon Heat Ray).
* AdaptationalNationality: American, given that his father is technically French (he was born from the French Polynesia) and being distant from the Japanese Godzilla.
* AdaptationalWimp: Not even close to as bad as his father, but he's almost always on the losing end against any kaiju he fights against, requiring his human allies to find the monster's weakness first, unlike his Japanese counterpart, who was frequently able to defeat his foe without any help.
* AllAnimalsAreDogs: For one scene in the first episode ''New Family'', right when Nick tosses his jacket away to distract him and closes the door, the big and monstrous marine iguana by then, lightly scratches the door, walks in a circle, lies down, and starts moaning/whining, which is a behavioral trait that is likely no different than any other dog that will likely do similar actions and misses their owners.
* AlternateSelf: Emmerich's, Devlin's, and Toho's stance is that the 1998 film and this series are set in their own continuity unrelated to any of the other films, aside from a brief TakeThat in ''GMK'' towards his father. Ergo, the versions of the monster that appeared in ''Final Wars'' and ''Rulers of Earth'' are ''not'' the same monster that was gunned down on the Brooklyn Bridge or this one, but separate incarnations of the character. While Toho is legally obligated to call his father and him as Godzilla, he is seen in the eyes of fans worthy of Godzilla's MeaningfulName "God Incarnate".
* AmplifiedAnimalAptitude: Godzilla frequently displays intelligence and tactical thinking far greater than what one would expect an animal to be capable of.
* BerserkButton: If you value your life, do NOT mess with his "father" Nick Tatopoulos.
* BewareOfViciousDog: More like giant radioactive lizard, but he definitely qualifies. If you are an ally of Nick's, he won't lay a finger or step on you like a cockroach. If you are a threat or, God incarnates in other universes help you, ''harm'' his father Nick or his allies, he'll burn you into a charred radioactive corpse.
* BigDamnHeroes: 24/7. Taken to extreme levels during the bad future where he saved the last known humans from the Dragmas. He's considered a hero to the survivors, who erected a statue in his memory in their underground base.
* TheBigGuy: They don't come much bigger. While Nick and company provide scientific analysis of the various, oddball creatures they encounter, it's Godzilla who does the heavy lifting by fighting and killing them when necessary.
* BreathWeapon: A green napalm-like blast of fire. His spines and eyes flash just before he uses it, and it's shown to be hot enough to melt sand into glass. It's actually shown that he literally inhales and exhales the blast as it charges up from his spines to his head. Until ''Film/Godzilla2014'' and ''Film/GodzillaMinusOne'' respectively, he was the first Godzilla to literally breathes his atomic breath this way.
* BullyingADragon: Godzilla is more than content to live in his cavern in the Hudson River next to his human family, but he's always become a target for other humans to capture. Godzilla and the H.E.A.T team would swiftly puts an end to it near the end of the episode.
* TheCameo: Made a brief cameo as a plushie in ''Anime/GodzillaSingularPoint''.
* CompositeCharacter: He takes traits from his parent, appearance-wise and ability-wise (such as his ability to dig tunnels), though also has the [[BreathWeapon Atomic Breath]] of the original Japanese incarnations. He has the tactical thinking and atomic breath of the Showa Godzilla, and the ferocity and viciousness of Heisei Godzilla. On a good day, he has the gentleness of Godzilla Junior of the Heisei saga.
* ContrastingSequelMainCharacter:
** Godzilla heavily contrasts his own father, the first Godzilla. Godzilla would go out of his way to fight several monsters, and protect humanity. He's even more in line with the [[Film/GodzillaRaidsAgain Showa]] and [[Film/TheReturnOfGodzilla Heisei]] Godzillas for being aggressive and smart in his fights. Despite being RaisedByHumans, Godzilla will not tolerate any aggression (or perceived) against him and his adopted family. And unlike his biological father, he is much TruerToTheText than him in terms of abilities and combat prowess.
** To [[Film/GodzillaVsMechagodzillaII Godzilla Junior]] of the Heisei saga. They were both HappilyAdopted and RaisedByHumans, and their positive influence allowed them to be saviors of humanity rather than its destroyers. The huge difference between them is that Heisei Junior is adopted by Heisei Godzilla as his son, and he still cares about humanity as a whole, and becomes its savior at the conclusion of ''Film/GodzillaVsDestoroyah''. This Godzilla, however, [[ArchNemesisDad eventually turns against his biological father]] for trying to turn him against humanity, and sticks by his adopted father's side.
* DestructiveSavior: Like any heroic or anti-heroic versions of Godzilla, his sheer size and powers means he'll inevitably causes damage whenever he fights another monster in a major city or location. It makes perfect sense when you remember Godzilla was traditionally personified as a ''God of Destruction'', and his name means "God incarnate".
* {{Determinator}}: Typical for any version of Godzilla. But it gets to OffscreenMomentOfAwesome levels in the BadFuture, where he apparently saved the entirety of what's left of the humans in New York, if not the remainder of humanity on the planet by fighting off an entire ''pack'' (if not the entire race) of Dragmas in what turned out to be his LastStand.
* TheDreaded: Godzilla is over 150 feet tall, looks like a cross between an iguana and a UsefulNotes/TyrannosaurusRex, and breathes a stream of atomic fire. The citizens of New York are quite justifiably terrified of him. Well, those reasons and the whole fact that his biological father kinda destroyed a good chunk of the infrastructure of New York during the movie...
* EarlyInstallmentCharacterDesignDifference: This weirdly applies to his tongue. In earlier parts of the show, he had a normal-looking tongue. Later parts of the series gives him an arrow-shape tongue. This even applies to Zilla in the IDW comics.
* ExtremelyProtectiveChild: He is ''very'' protective of his adoptive father Nick Tatopoulos.
* FinishingMove: Usually his atomic breath.
* {{Fireballs}}: In the two Game Boy games, Godzilla's green atomic breath is replaced by balls of green fire it shoots from its mouth.
* FragileSpeedster: By kaiju standards, anyway. While still able to take a beating from other giant monsters, conventional weapons have consistently been shown to be a threat to him.
* GeniusBruiser: He's been shown [[ItCanThink to be surprisingly clever at times]], outwitting some monsters, responding appropriately to Nick's instructions, and even recognizing when the situation calls for different tactics.
* GentleGiant: Has his moments. When he's not fighting monsters, he's usually shown just hanging out in the Hudson, minding his own business. Justified, as Nick spends a considerable amount of time actively teaching him to be gentle around humans.
* GiantEqualsInvincible: Zig-zagged. On one hand, conventional weapons can hurt him. On the other hand, he is tougher to put down, considering he survives multiple missiles whereas it took 12 (or 4 in the series) to put down his father. He also has a HealingFactor, but his regeneration isn't as good as the Heisei or Millennium series' Godzillas.
* GiganticAdultsTinyBabies: As a new hatchling, Junior was just a bit bigger than adopted father Nick when they first met. He eventually grows to match the skyscraper size of his biological father.
* GoodIsNotSoft: Godzilla is still a giant fire-breathing reptile who is either summoned or shows up by his own volition to fight whatever MonsterOfTheWeek that appears, and has no hesitation maiming or killing the offending creature if he or Nick is threatened (with exceptions, such as Nessie and Komodithrax). H.E.A.T., Audrey, Animal, and Hicks are never truly complacent about being around Godzilla, knowing full well that they [[GiantFootOfStomping could be crushed]] at any moment. Even human threats to Nick won't be tolerated, as shown in the episode "Lizard Season."
* HappilyAdopted: He [[{{Imprinting}} imprinted]] on Nick as his father and has loyally followed him since.
* HarmlessFreezing: The one shot comic "Ice Cold Winter" has Godzilla being frozen solid by Cameron Winter, only to emerge none the worse for wear when H.E.A.T. frees him.
* HealingFactor: Best demonstrated in "Where is Thy Sting?" where a wound inflicted by Ts-Eh-Go heals in seconds after the scorpion's poison is removed from Godzilla's system.
* HeroWithBadPublicity: Understandably, seeing as his father destroyed a good chunk of New York, he often causes damage even when he stops whatever MonsterOfTheWeek appears, and he's been mind controlled into rampages, which beyond giving him a bad reputation also leads to a number of attempts to kill him.
* HeroicSacrifice: In the BadFuture, he died holding off the D.R.A.G.M.A., saving the lives of thousands in New York.
* HorrifyingHero: Not his fault, since he's a 60-metered NuclearMutant iguana that can shoot radioactive fire from his mouth, and the citizens of New York are understandably weary of him. While the citizens of New York reluctantly sees him as a hero, the military begins to tolerate his presence, despite Goji's human upbringing.
* {{Imprinting}}: Due to Nick being the first thing he sees after hatching (as well as Nick being covered in amniotic fluid from the other Godzilla eggs), Godzilla assumes that he is his parent.
* InNameOnly: Played with. While he still has the same weaknesses as his father, he has a HealingFactor the Showa and Heisei Godzillas were known for, and a ''whole lot tougher'' to put down. His father infamously didn't have an atomic breath (until he was revived as a cyborg), but he possesses one, and uses it to finish off his opponents. And lastly, he'll pick fights with monsters who threatens humanity, unlike his father who would run from a fight, and only retaliate when angered, or ''[[PapaWolf truly angered]]''.
* InSeriesNickname: "The G-Man" as Randy frequently calls him.
* InconsistentColoring: Godzilla would be colored either grayish-silver, to charcoal-brown with gray, and occasionally close to two shades of purple. About the only consistent coloring would be his eyes being yellow-orange and dorsal fins being at least some shade of light blue/teal.
* ItCanThink: He isn't just big and strong, he is also intelligent, having won a number of fights through his intellect when brute force wasn't enough.
* KingKongClimb: He climbs to the top of the Empire State Building during the show's opening song, as seen in the above image.
* LanternJawOfJustice: Like his parent, Godzilla has a large under bite and very prominent chin. ''Unlike'' his parent, he was taught from an early age to protect humans.
* LastOfHisKind: Can't [[MisterSeahorse reproduce asexually]] and killed his resurrected biological-turned-cyborg parent, the original Godzilla, in "Monster Wars".
* LegacyCharacter: To Godzilla Sr. Needless to say, Junior [[SuperiorSuccessor far surpassed his father's legacy]].
* LightningBruiser: He is a giant, but he's also extremely fast.
* LikeFatherUnlikeSon: Godzilla is anything but a coward. Whenever his father gets into conflict with the military, he would run off when getting shot at, and only retaliates when angry enough. He on the other hand would fight back, and is much smarter in his fights, and will go out of his way to defeat the MonsterOfTheWeek to the death.
* LovableLizard: A giant radioactive lizard that can shoot radioactive fire, cause collateral damage, and fight other monsters in major cities. But on a good day, he's friendlier towards his adoptive family, and will go out of his way to save them from major threats.
* LoveHurts: In one episode, he fell in love with a mutant Komodo dragon, Komodithrax, and became her mate and surrogate father of her egg (she could reproduce asexually). When she and the egg were lost at the end of the episode, Junior roared his grief and despair to the world.
* MercyKill: The way Godzilla shoots his atomic breath with great ferocity on his cyborg father indicates that his cyborg father wants to die after briefly regaining control. He definitely is more than willing to put him out of his misery before the Leviathan aliens regain control of him.
* MeaningfulName: It took a while, but Godzilla earned his name as "God Incarnate", which leads to him as a [[DestructiveSavior God of Destruction]] who lives in New York.
* MightyRoar: His own roar is just as recognizable and iconic as Toho's Godzilla.
* MythologyGag: Rather than a solid beam of light of the Heisei incarnation, Godzilla's atomic breath looks like a flamethrower akin to the 1954, Showa, and Hanna-Barbera Godzillas.
* NatureVsNurture: The main difference between this Godzilla and his father: his father was more or less a giant animal while Nick spends most of the first episode teaching him to be gentle towards humans. This results in him being humanity's protector rather than its destroyer.
* OlderHeroVsYoungerVillain: Inverted. Some of his opponents are even older than he is (including prehistoric monsters), but is able to defeat them with no problem. And he's only two years old despite being a full-grown adult.
* PlotRelevantAgeUp: He ages from a hatchling only a bit bigger than a human to a skyscraper-sized monster within a few months at absolute most.
* PowerGlows: His eyes and spines flash green right before he uses his atomic power breath.
* RageBreakingPoint: You'd have to be [[TooDumbToLive a real dumbass to piss him off]]. "Lizard Season" shows exactly what happens when you make him ''really'' mad: Because of the Lizard Slayers, Godzilla is unable to tell friend or foe, attacking the military, H.E.A.T, and the Lizard Slayers with reckless abandon. After Nick calms him down and has H.E.A.T take out each slayer robots, he bites through Dale's slayer through the cockpit, and once Dale, Hank, and Bill get arrested, he is shown taking his anger out on Dale's slayer to vent his frustration.
-->'''Monique''': If I had not armed the H.E.A.T seeker, Winter could have not used it against us.\\
'''Randy''': Apologize to ''him'' (points at a very pissed off Godzilla biting on the destroyed Lizard Slayer).
* RaisedByHumans: Godzilla's first visual impression is Nick, and becomes raised by him and other H.E.A.T members, which allows him to become humanity's savior than its destroyer.
* RapidAging: Godzilla was barely a day old after he met Nick, but he was already the size equivalent of [[Film/GodzillaVsSpaceGodzilla Little Godzilla]], and after he survives the airstrike and followed Nick's HEAT Seeker boat, he's the size of [[Film/GodzillaVsDestoroyah Godzilla Junior]], then reaches his maximum size for the rest of the series.
* RedeemingReplacement: Whereas his father was a destructive monster (not out of maliciousness, just by virtue of being a giant mutant iguana trying to nest in a major city), Godzilla is friendly towards Nick (and by extension, humanity in general) and protects the world from other mutations. He can also be seen as this in a Meta sense, given that he is much TruerToTheText than his father and was much more well-received by the fans.
* RedEyesTakeWarning: Has a pair of gleaming red eyes (with orange pupils) who's a beast not to be trifled with as he will not hesitate to destroy any monster who'll try to threaten Nick or any of his trusted friends. Those actually that do ''will'' regret their existence. His eyes will actually glow when he's ready to launch his atomic breath.
* RoarBeforeBeating: Always lets out a roar before tackling the MonsterOfTheWeek.
* SeaMonster: He's capable of remaining submerged indefinitely and can cross entire oceans whenever he pleases.
* SmallParentHugeChild: Exaggerated. Nick Tatopoulos serves as the surrogate father of Godzilla Jr., and he is the size of a normal human while his "son" is as big as a building.
* StrongAsTheyNeedToBe: Physically how strong he is, how durable he is, and the punch his BreathWeapon packs depends on the needs of the plot. Normally he can tunnel through bedrock, but in one episode his head is caught in a bridge.
* SuperSpeed: He has magnificent running capabilities, being able to sprint at around 300 MPH.
* SuperiorSuccessor: Has all the strengths of his parent, and also has classic-style atomic breath. This is showcased in his and Cyber-Godzilla's fight, as despite having been resurrected much stronger than before, Jr. still wins and is obviously stronger.
* TeensAreMonsters: Only in strength along with the ferocity of his atomic breath. In the first episode, he grew around 30 meters in his second appearance. He becomes fully-grown for the rest of the series.
* TailSlap: One of his most effective attacks.
* TruerToTheText: Unlike his father, this Godzilla has more in common with his Toho inspiration. He fires atomic breath, he's difficult to be taken down by conventional military weapons and does frequent battles with other giant monsters.
* TunnelKing: Like his father, he's an adept burrower. He can tunnel through bedrock easily. This is notable in "Cat and Mouse" where he dug through the Hudson River whereas his father tried to and got shot by two submarine missiles (but still survived).
* VegetarianCarnivore: Inverted. He's a mutated green iguana, which are herbivores, but his diet consists mainly of fish. He tried to eat Nick and Audrey in the first episode, and also chased after giant mutant rats. Amusingly, the team once tried to feed him seaweed substitute to prevent him overeating the local fish stocks, but he simply spat it back out once he tasted it.
* WeakenedByTheLight: In both "The Winter of Our Discontent" and "Cash of the Titans", Godzilla is blinded by bright lights, leaving him vulnerable to attack by the Cyber-Flies and Rhinosaurus respectively.
* TheWorfEffect:
** Whenever he faces the MonsterOfTheWeek, the monster of the episode will quickly disable/take him down to show their threat level. After that he or the team will defeat the monster and he finishes them off.
** In an alternate future in which the world was overrun by genetically engineered monsters known as Dragmas, Godzilla was slain in battle against the creatures. Though if Craven is to be believed, he died fighting off an entire pack of Dragmas, if not the entire race at that point, to save the last of humanity in New York City.
* WouldHurtAChild: If an offspring monster is non-malicious, he will go out of his way to save it with the aid of that monster's parent. If you are a threat to Nick and his human family, well, ask Quetzalcoatl and her chicks.
* YouShallNotPass: According to the future Craven, Godzilla died holding off an entire pack of D.R.A.G.M.A., saving what was left of New York in the process.
* YoungerThanTheyLook: He is two years old by the second season, making him the youngest incarnation of Godzilla.
* YourSizeMayVary: His size is very inconsistent. For one, he is supposed to be 60 meters, but his size tends the fluctuate from being bigger than the Brooklyn Bridge to being smaller than the Empire State Building. In fact, in "What a Long, Strange Trip It's Been", Nick and Monique are small enough to enter his body to rid of his Bacillus infection, to the point that they can enter his brain matter and exit through his nose, when even in the movie, the humans are barely any smaller than one of his father's nostrils.
[[/folder]]

[[folder:Dr. Niko "Nick" Tatopoulos]]
[[quoteright:275:https://static.tvtropes.org/pmwiki/pub/images/gts_nick_tatopolous_outdoors.png]]
[[caption-width-right:275:Proud "dad" of a giant mutated lizard.]]
--> '''Voiced By:''' Creator/IanZiering

* AdaptationalDyeJob: In the film, Nick has dark brown hair and eyes. Here, he has blue eyes and his hair is a lighter shade of brown.
* AdaptationalJerkass: Downplayed, but in the movie, Nick had some empathy for the first Godzilla and seemed somewhat saddened by his death. In the series, he shows no compassion for the first Godzilla when he dies [[spoiler: or when he's resurrected as Cyber-Godzilla]]. This gets balanced by the fact that he basically "adopts" Junior from the start.
* AdaptationPersonalityChange: He is less socially awkward than in the movie as well as being very proactive in defeating the MonsterOfTheWeek while helping Godzilla when the big guy is in trouble.
* ArbitrarySkepticism: Doesn't believe in the Loch Ness Monster, despite all the things he's seen and done up until that point in the series, including ''meeting aliens'' just a few episodes earlier.
* BadassBookworm: While a scientist first and foremost, Nick is quite capable of picking up a gun to take on mutations when the situation requires it.
* BorrowedCatchphrase: "Go! Go! Go!" was actually used by Animal in the film. In the show, he's the one who frequently says it.
* EmbarrassingNickname: Cameron Winter refers to him by his college nickname "Nickels", a not-so-subtle jab by Winter at Nick's financial prospects.
* {{Expy}}: Of Azusa Gojo from ''Film/GodzillaVsMechagodzillaII'' where they raised a member of Godzilla's family, which resulted in a positive influence that allows their respective Godzilla Juniors to become saviors of humanity rather than their destroyers. Bonus points for also being biological scientists.
* FatherlyScientist: After Junior imprints on him, Nick assumes the role of his father. Without his influence, Godzilla would just be another mutation for H.E.A.T. to deal with.
* TheLeader: Leads the team and is in charge of Godzilla.
* MeaningfulName: ''Niko'' is a short form of ''Nikolaos'', which is Greek for "victory of the people". Guess what his discoveries lead to in the film and throughout the series.
* NervesOfSteel: In the show, he'll face down a mutation of the episode, and will try to defeat it. After doing most of the handiwork, Godzilla will jump in and help finish the job.
* NiceGuy: Usually amiable and tries to get along with everyone.
* PapaWolf: Let's just say it's [[BerserkButton not a good idea to do anything that will harm Godzilla]] around him.
* TookALevelInBadass: He's a ''lot'' more pro-active in the series than he was in the movie, FridgeBrilliance kicking in when one is considered "dad" by a 150-ft second-generation mutated lizard.
* {{Tuckerization}}: Named after creature/visual designer Creator/PatrickTatopoulos, who worked on the 1998 film.
* VerbalTic: He has a tendency to repeat one-word orders three times during emergencies.
--> '''Nick:''' Go, go, go!
* TheWormGuy: The TropeNamer, and occasionally still called by it despite having changed the purview of his "research" to studying a giant lizard.
[[/folder]]

[[folder:Dr. Elsie Chapman]]
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/gts_elsie_chapman.png]]
--> '''Voiced By:''' Charity James

* AscendedExtra: She was a minor character in the film who largely disappeared after Godzilla appeared in New York. Here, she is given a much larger role.
* BettyAndVeronica: Serves as the Betty to Audrey's Veronica. Elsie is a down-to-earth scientist who occasionally flirts with Nick (especially to annoy Audrey), while Audrey is an ambitious anchorwoman who is actively in a relationship with Nick.
* DeadpanSnarker: Many of her lines are this.
* FieryRedhead: Elsie has a sharp wit and is not afraid to jump headfirst into danger or flirt with Nick in front of Audrey.
* TheGloriousWarOfSisterlyRivalry: The Smart sister to her to-be-married Beautiful sister Kate in "Wedding Bells Blew", much to Elsie's annoyance.
* RedheadInGreen: Has red hair and usually wears a green sweatshirt.
* SheCleansUpNicely: As her blind date with Craven proved, Elsie knows how to doll herself up whenever she feels like it.
* TomboyAndGirlyGirl: The Girly Girl to Monique's Tomboy.
* TheUnfavorite: Despite her academic achievements, her parents favor her younger sister over her. After she bravely leads the Sub-Zero Manta away from the her family, along with Godzilla's assistance, they immediately changed their minds.
[[/folder]]

[[folder:Dr. Mendel Craven]]
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/gts_mendel_craven_outdoors.png]]
--> '''Voiced By:''' Malcolm Dunare

* AdaptationDyeJob: Mendel's originally a short-haired brunette in the film. Here, he's a blonde with a ponytail.
* AmbiguouslyJewish: Randy had sampled his mother's voice to use on N.I.G.E.L. to mess with Mendel. It causes the robot to start adopting the mannerisms of his mother, sounding like a stereotypical JewishMother, complete with terms like "punim" and "bubbeleh". Mendel himself never outright says or does anything to suggest he is Jewish, assuming he could at least be Jewish by culture.
* AscendedExtra: He was a minor character in the film who largely disappeared from the story after Godzilla appeared in New York. Here, he is given a much larger role.
* ButtMonkey: Usually gets the short end of the stick.
* CowardlyLion: Make no mistake; this guy might be even afraid of his own shadow but the fact he still stays with and helps the company that deals with giant monsters in order to save people is a testament on how much of a good person he is.
* {{Flanderization}}: In the film, the guy only had minor summer cold, and doesn't get brought up again for the rest of the movie. In the series, he's allergic to practically ''everything'', got seriously infected by the remains of the Mutant Bacillus, and touched N.I.G.E.L's toasted head by Godzilla which should be covered in radiation. It's even a wonder that he's still kicking, leading to Monique wondering what is he ''not'' allergic to in "Hive."
* FutureBadass: After most of the team disappeared for 23 years, Mendel and Godzilla were the only H.E.A.T members around until Godzilla gave his life to save a bunch of humans from Dragma infestation. As a result, Mendel could only gather enough people to form [[LaResistance a human resistance]] to fight off the Dragmas after they basically killed other monsters released by Hicks to at least have a fighting chance. It isn't until the core H.E.A.T members wound up in the future that he gave them weapons to kill the Dragmas before they can cause the BadFuture.
* HeartbrokenBadass: In the BadFuture, he never did as much as received a kiss from Elsie even long after his friends disappeared for 23 years. Elsie throws both him and his present self a bone by giving them a kiss respectively.
* InkSuitActor: His AdaptationDyeJob actually inverted this, as while Malcolm Dunare did come back to voice the character, Dunare has brown hair and it was cut short in the movie, as opposed to the long blond hair Mendel sports here.
* MeaningfulName: ''Craven'' means "coward".
* MustMakeAmends: In "Ring of Fire", after he brought the Fire Monster to H.E.A.T. Headquarters, he confesses to his Teammates and decides to fix his mistake by stopping the Fire Monster.
* NiceJobBreakingItHero: In the episode: "Ring of Fire", he programs N.I.G.E.L. to bring the Fire Monster to H.E.A.T. Headquarters so he can study it, but then it wakes up and attacks them. He decides to redeem himself.
* RedOniBlueOni: The Blue to Randy's Red, being far more cautious and not that keen one taking the same crazy risks Randy does, as well preferring lab work to field work, and older than Randy with a more calmer personality. In civilian clothing, Mendel wears a white lab coat in contrast to Randy's blue sports jacket (hinting at their "order versus chaos" perspectives); when out in the field, Mendel favors a blue vest and shirt compared to Randy's green and occasional yellow shirts. Mendel tends to be highly nervous when reacting towards or in the presence of Godzilla, versus Randy typically cheering on Godzilla regardless of proximity.
* SicklyNeuroticGeek: In short: a summer cold from the [[Film/{{Godzilla1998}} movie]], rat dander, pollen, bee stings, chances of bronchitis, getting over a normal cold, plenty of sun protection on using SPF 90 sunscreen and a robe, sand making him itch, sun giving him blisters, earaches from swimming, requires the occasional use of an [[NerdyInhaler inhaler]], plus allergies to several "variety of trees and shrubs, most grasses, a couple dozen animals, 25 or so foods, rubber, and rubber products." The ONE time he truly gets sick beyond normal standards is after getting infected by the Giant Bacillus's slime in "What a Long, Strange Trip It's Been". As lampshaded in the episode "Hive":
--> '''Monique:''' ''(exasperated)'' "Is there nothing he is ''not'' allergic to?"\\
'''Elsie:''' ''(cheerfully)'' "Nope."
* TheSmartGuy: He's the team's tech wizard, usually putting together most of the equipment the team uses, with the occasional round of chemistry thrown in.
* SmartPeopleBuildRobots: As the team's [[TheSmartGuy Smart Guy]], Craven builds and maintains N.I.G.E.L., who in Craven's own words is "the most sophisticated robot on the planet".
* TookALevelInBadass: While he has his fair share of moments, his future counterpart tops them all. After the Dragmas took over, he became the leader of a resistance and became very buff in order to survive.
[[/folder]]

[[folder:Randy Hernandez]]
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/gts_randy_hernandez.png]]
--> '''Voiced By:''' Creator/RinoRomano

* AmazonChaser: His attraction to Monique is evident the first time they meet. The first time they meet involves her judo-flipping him.
* CharacterCatchphrase: "Never bet against the G-man!"
* GratuitousSpanish: Although prominent in the episode "D.O.A." where they're in Central America, it must be noted that Portuguese is different from most forms of Spanish. Both are Romance languages, meaning they're descended from Latin. Some misunderstandings are understandable.
* HiddenDepths: He learned Navajo, one of the hardest languages to learn, because he thought it was cool that the Imperial Japanese forces [[https://en.wikipedia.org/wiki/Code_talker#Navajo never cracked it]] during the Pacific theater in UsefulNotes/WorldWarII.
* TheLancer: To Nick, being younger, less mature, and not as well-versed in science as he does.
* TheNicknamer: Refers to his team mates by nicknames such as “Jefe” for Nick, “Doc” for Craven and “G-Man” for Godzilla Jr.
* PlayfulHacker: Messes with NIGEL on [[OnceAnEpisode an episodic basis]].
* RedOniBlueOni: The Red to Mendel's Blue, being far more gungho and risk-taking compared to Mendel with a much younger personality, as well being younger than Mendel. In civilian clothing, Mendel wears a white lab coat in contrast to Randy's blue sports jacket (hinting at their "order versus chaos" perspectives); when out in the field, Mendel favors a blue vest and shirt compared to Randy's green and occasional yellow shirts. Mendel tends to be highly nervous when reacting towards or in the presence of Godzilla, versus Randy typically cheering on Godzilla regardless of proximity.
* SlapSlapKiss: Quite often with Monique.
* TwoferTokenMinority: Black-Portuguese.
[[/folder]]

[[folder:Monique Dupre]]
[[quoteright:250:https://static.tvtropes.org/pmwiki/pub/images/gts_monique_dupre.png]]
--> '''Voiced By:''' Brigitte Bako

* ActionGirl: Very competent in combat and infiltration.
* TheBigGuy: Though Godzilla Jr. is this for the team by stepping in to fight the MonsterOfTheWeek when the team almost inevitably [[ImmuneToBullets cannot defeat it with mundane weapons]], Monique serves this role for the team when the action is on a human scale. She is by far the best shot and fighter on the team.
* BoyishShortHair: She sports it.
* CharacterDevelopment: Probably has the most of the main cast, as she develops from an openly hostile antagonist who thinks every monster needs to be destroyed, to a trusted and loyal team member who actively fights her own superiors over needing Godzilla as an ally and supporting the creation of a "sanctuary" on the Isla del Diabolo.
* CheeseEatingSurrenderMonkeys: {{Averted|Trope}}. She's the most courageous member and best fighter on this team of badasses.
* DeadpanSnarker: Even more than Elsie.
* DefrostingIceQueen: When she first encounters Randy, his crush on her was unrequited, and working with the team was strictly business-only. Later on, she became a bit more comfortable with the team and started liking Randy a little.
* DependingOnTheArtist: She went from broad-shouldered and muscular in season one, to athleticly skinny in season 2.
* {{Determinator}}: Still kept going in spite of a broken leg in "Hive" until the end as one example. Which leads to...
* DontYouDarePityMe: Practically jumped down Craven's throat when he offered to help her with her broken leg. It took a volcanic eruption and Craven flipping out at her to convince her to (grudgingly) admit that it was okay to accept help.
* GratuitousFrench: Speaks French on occasion.
* TheLancer: Especially earlier on when she was very much in favor of destroying every mutation the team encountered, Godzilla included.
* MsFanservice: Is quite attractive, and often flaunts it, [[InnocentFanserviceGirl unknowingly]]. "The Twister" has her wear a very revealing bikini.
* TheSixthRanger: She was initially sent to destroy Godzilla before becoming the newest member of the team.
* SlapSlapKiss: Quite often with Randy.
* TallDarkAndSnarky: Is as tall as the boys of her team, wears dark clothes and makeup, and speaks almost exclusively in sarcasm.
* TomboyAndGirlyGirl: The Tomboy to Elise's Girly Girl.
* TheQuietOne: She doesn't talk very much, despite getting in the majority of sardonic quips in the series.
* TwoferTokenMinority: She is a French-Vietnamese woman.
[[/folder]]

[[folder:N.I.G.E.L.]]
--> '''Voiced By:''' Creator/TomKenny

* TheChewToy: He gets destroyed [[OnceAnEpisode on an episodic basis]], is constantly being reprogrammed by Randy and has a built-in AAAAARRRRGGHH! whenever he dies.
* FunWithAcronyms: '''N'''ext-Millennium '''I'''ntelligence '''G'''athering '''E'''lectronic '''L'''iaison.
* FunnyRobot: Between his ridiculous impersonations and his many, ''many'' deaths, N.I.G.E.L. is the most consistent source of humor on the show.
* FutureBadass: In "Future Shock", N.I.G.E.L. is equipped with a much larger and more robust body, presumably to help withstand life in a post-apocalyptic hellhole where replacement parts would be scarce.
* IronButtMonkey: N.I.G.E.L. gets destroyed on a regular basis. But no matter how damaged he gets, Mendel always manages to rebuild him, even when there's nothing left to rebuild him from..
* LandSeaSky: While usually just terrestrial, several episodes give N.I.G.E.L. an aquatic mode for underwater operations. The ''Godzilla: The Series'' Game Boy game also adds a helicopter mode to allow him to observe mutations up close, [[TheyKilledKennyAgain with predictable results]].
* ShockAndAwe: While he most of the time he acts TheChewToy, he does carry cables that can deliver a powerful electric shock.
* SpeaksInShoutOuts: Due to Randy constantly reprogramming him to [[{{Troll}} troll]] Craven, N.I.G.E.L. frequently impersonates well-known actors and characters, such as Creator/JohnWayne and Franchise/JamesBond.
* SurveillanceDrone: In "Monster Wars", N.I.G.E.L. is shown to contain numerous spider-like robots that Craven is able to use to investigate the Sandy Point Military Base remotely.
* TankTreadMecha: N.I.G.E.L.'s basic and future forms both use tank treads to move around.
* TeamPet: Of the RobotBuddy variety. While N.I.G.E.L. does have his uses, his role in the series is largely comic relief (even when he's being useful he ends up destroyed).
* TheyKilledKennyAgain: Gets wrecked OnceAnEpisode, more than a few of them have been from Godzilla (He's even voiced by Tom ''Kenny'').
[[/folder]]

!!Kaiju

[[folder:In General]]
* BrainWashed: During the "Monster Wars" series, most of the monsters that had survived up to this point are put under mind control by the Leviathan aliens.
* DemotedToExtra: While a handful of the monsters do return later in the series (most notably in the "Monster Wars" trilogy and "S.C.A.L.E."), they are mostly limited to extended cameos.
* {{Kaiju}}: Given that this series is part of the ''{{Franchise/Godzilla}}'' franchise, this should be a given.
* MonsterOfTheWeek: Most monsters are limited to one appearance, although a handful survive to have cameos later in the series.
* NonMaliciousMonster: This series constantly points out that most of the monsters are just acting out their natural life cycles like any other animals. However, there are several notable exceptions, including the D.R.A.G.M.A. (creatures bred ''specifically'' to kill humans by the millions), the Techno-Sentient (an alien lifeform hellbent on causing global Armageddon), the Crackler (a living dream attacking anything his creator subconsciously hated), and basically anything that [[BigBad Cameron Winter]] had a hand in creating.
* TragicMonster: Most of the monsters are just mutated animals trying to live their lives. Unfortunately, their size means that they can no longer do so without causing rather severe destruction. This necessitates H.E.A.T. and Godzilla hunting them down, ending in the monsters' destruction (or at the very least, spending their lives imprisoned in remote locations where they can do no harm).
[[/folder]]

[[folder:Mutant Giant Squids]]
!!!'''Debut:''' "New Family: Part 2"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/mutant_giant_squid.png]]

The mutant giant squids are the first antagonistic monsters in the series (though too weak to be much of a real threat), attacking swimmers and boats off the coast of Jamaica, which was then blamed on Godzilla and resulted in the military attacking him. Later, H.E.A.T. discovers they are responsible for the attacks and they are killed by Godzilla, only for it to be revealed they are just a food source for a much bigger mutation.
----
* AlwaysABiggerFish: They may be strong enough to threaten humans and small ships, but they are little more than CannonFodder for bigger mutations like Godzilla and Crustaceous Rex, the latter of which is actually responsible for driving them to the surface in the first place.
* CombatTentacles: Comes with being giant squid and all. They specialize in grabbing people from boats (when they aren't bothering to pull whole boats underwater).
* GiantSquid: Obviously.
* TheGoomba: They appear in both Game Boy games as minor recurring enemies.
* SmallRoleBigImpact: Crustaceous Rex may be the main antagonist of their episode, but the squids are what drive the plot. They were responsible for attacking swimmers and boaters in Jamaica, which caused Monique to tip off the military to Junior's existence, nearly leading to his death when Hicks and his men attacked him. Later, Godzilla returns to fight them off when they attack Nick, which in turn leads to C-Rex attacking Jamaica (due to Godzilla destroying his main food source), revealing to the world that there are more mutations out there.
[[/folder]]

[[folder:Crustaceous Rex (a.k.a. C-Rex)]]
!!!'''Debut:''' "New Family: Part 2"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/c_rex_4.png]]

Godzilla's first opponent in the series, Crustaceous Rex is a mutant crustacean that first appeared off the coast of Jamaica, feeding off mutated giant squids until Godzilla destroyed its food supply. After being defeated by Godzilla, C-Rex would disappear until the Leviathan aliens summoned him to Site Omega to take part in their plans to use Earth's monsters to soften up the Earth's defenses. Crustaceous Rex was one of the few monsters to survive the "Monster Wars" three-parter, at which point it was captured and became part of the Mutant Research Facility on Monster Island for the remainder of the series.
----
* AdvertisedExtra: C-Rex battles Godzilla on the cover of the "Godzilla: The Series- Monster Wars" video game, despite the fact that he doesn't appear anywhere in the game itself.
* BadFuture: In an alternate future in which the world was overrun by genetically engineered monsters known as Dragmas, C-Rex was released from Monster Island to fight them, but was slain in battle against the creatures.
* BizarreTasteInFood: It feeds on tar, and is seen ripping up and eating asphalt after its normal food source (mutant squids which produce tar as a defense) is killed off by Godzilla.
* CombatTentacles: He uses his tentacles to grapple with his opponents.
* FoodChainOfEvil: Was the primary predator of the giant squids that were attacking people.
* MixAndMatchCritters: It has the head and tentacles of a cuttlefish with a crustacean-like shell and two legs, giving it a Tyrannosaur-like posture.
* NonIndicativeName: There's really nothing remotely crustacean-esque about him, having more resemblance to a cuttlefish with bird legs.
* RecurringCharacter: Comes back for the "Monster Wars" trilogy, then later "SCALE."
* StarterVillain: The first monster Godzilla Junior fights and the one that reveals there's more mutations out there.
* SuperSpit: It's able to shoot tar from its mouth.
* TrapMaster: In the game, its Tar Shot is capable of temporarily immobilizing Godzilla.
* UnexplainedRecovery: Survives his encounter with Godzilla after the latter severed his tentacles and buried him alive with a rock slide. Given that many cephalopods can regrow missing tentacles, this is likely due to C-Rex having a HealingFactor rather than a result of a continuity error.
* WarmUpBoss: The first antagonistic monster to appear in the series, and while its greater size made it more of a threat than the giant squids it preyed on, against Godzilla it still lost without putting up much of a fight.
[[/folder]]

[[folder:El Gusano Gigante]]
!!!'''Debut:''' "D.O.A."
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/el_gusano_gigante.png]]

A giant worm mutated by a rare poisonous plant in Mexico, El Gusano Gigante proceeded to ravage the local farmland until confronted by H.E.A.T. and Godzilla. H.E.A.T. discovers El Gusano's weakness to extreme heat, and Godzilla is able to shrink the worm back down to its original size with a sustained blast of his atomic breath. El Gusano Gigante would later regrow to kaiju-sized and was taken over by the Leviathan aliens, who deployed it to attack Moscow. After H.E.A.T. destroyed the Leviathan aliens' control beacon, it turned on its former masters but was quickly killed off.
----
* AdaptationalBackstoryChange: In the "Monster Wars" game, El Gusano Gigante first surfaces in Nigeria, in contrast to the series where he first appeared in Mexico and was deployed to Moscow during the Monster Wars (Nigeria was where the Giant Bat first originated).
* BigCreepyCrawlies: It's a giant worm.
* EvilIsBigger: At full size, El Gusano is the largest kaiju Godzilla faces in the entire series. The video game ''Godzilla: The Series- Monster Wars" lists his length as 400 meters.
* ExtraEyes: It has six eyes.
* GratuitousSpanish: The ''only'' monster in the entire [[Franchise/{{Godzilla}} Godzilla franchise]] with a Spanish name.
* GrowingMusclesSequence / MiracleGroMonster: When the South American military attack El Gusano and Godzilla with a chemical weapon of theirs, it only hurts Godzilla. It ends up mutating El Gusano even further, not only making him all around larger, but also giving him [[SpikesOfVillainy spikes down his back]] and even ''teeth''.
* KilledOffForReal: When the aliens' mind control over him is broken, he fights back against his would-be controllers. It doesn't go so well.
* KryptoniteFactor: Intense heat, like from Godzilla's BreathWeapon.
* MeaningfulName: Its name is Spanish for "[[ExactlyWhatItSaysOnTheTin the Giant Worm]]".
* PlayingWithFire: In his video game appearance, El Gusano is able to shoot fire from his mouth ([[{{Irony}} ironically]], he is weakened by fire in the series.)
* RecurringCharacter: Comes back for the "Monster Wars" trilogy.
* ShockwaveStomp: His secondary attack in the "Monster Wars" game, where he slams his head to the ground to send out shock waves
* SpikesOfVillainy: He has mult-pronged horns on his head, two rows of dorsal plates down his back, and eight bony spikes protruding from his tail.
* TunnelKing: He ''is'' a mutant earthworm, after all.
* UnexplainedRecovery: Godzilla's atomic breath reduces it back to an ordinary worm, yet it has completely returned to its massive proportions by the time of the "Monster Wars" trilogy.
[[/folder]]

[[folder: Nanotech Creature]]
!!!'''Debut:''' "Talkin' Trash"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/nanotech_creature.png]]

A colony of microbes with nanotech drivers attached to them, the Nanotech Creature was created by Dr. Felix Hoenikker of the Manhattan Institute for Advanced Technology to combat New York's growing refuse problem. However, it was activated before it had been properly tested and, unable to distinguish between garbage and non-garbage, began consuming everything in its path. H.E.A.T. is able to create a computer virus that separates the microbes from their nanotech drivers, petrifying the creature and allowing Godzilla to shatter it.
----
* AdaptationalLateAppearance: It appears in the video game adaptation of "Monster Wars", despite its sole appearance in the series taking place well before the first appearance of the Leviathan aliens.
* AIIsACrapshoot: The minute it was activated, the creature attack a nearby scientist and possibly would have devoured her.
* BlobMonster:It's just a vast colony of nanorobotic microbes so it'll take any shape it wants. Its preferred form is the shape of the microbes.
* {{Expy}}:The Nanotech Creature is probably based on [[Film/GodzillaVsHedorah Hedorah]] given that both monsters thrived on waste.
** Like Destroyah, the Nanotech Creature is composed of an entire colony of microorganisms joined together in one massive body.
* GoneHorriblyWrong: The creature could have benefited humanity if its creators had been able run more tests to fix all the flaws in its design. However, thanks to [[ObstructiveBureaucrat Dean Whitehead]] pushing them to have it launch before it was ready under the threat of unemployment, it didn’t happen. When it was activated, '''all hell broke loose'''.
* GreyGoo: It was created to consume petroleum-based waste and convert it into more nanomachines.
--> '''Dr. Hoenikker:''' In a nutshell, Nick: a Nanotech feeding frenzy. The more petroleum it consumes the more it replicates, and the more it replicates the more it needs to consume.
* MiracleGroMonster: When first released, it is small enough to fill a trash can-sized cylinder. As it consumes more petroleum-based waste, it grows until it rivals Godzilla in size.
* MuckMonster: Its entire body is composed from all the petroleum-based products it consumed.
* {{Nanomachines}}: Its body consists of billions of microbes with nanotech drivers attached to them to (theoretically) allow the whole thing to be controlled remotely. It [[GoneHorriblyWrong doesn't go so well]].
* ShoutOut: The Nanotech Creature's creator Dr. Felix Hoenikker is possibly a reference to the novel Literature/CatsCradle by Creator/KurtVonnegut. In the novel, a character named Felix Hoenikker invents a substance known as ice-nine, which converts all water it comes into contact with to more ice-nine; the Nanotech Creature consumes petrochemicals to create more of itself.
* TakenForGranite: It petrifies once the computer virus was injected into it. Godzilla took the chance to [[LiterallyShatteredLives smash it to bits]].
* TheWormThatWalks: It's really a colony of millions of microbes controlled by nanotech drivers, acting as one giant entity.
[[/folder]]

[[folder: Cyber Fly]]
!!!'''Debut:''' "The Winter of Our Discontent"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/cyber_fly.png]]

A squadron of mass-produced robotic flies created by Cameron Winter, the Cyber Flies were instrumental in Winter's plot to take control of Godzilla.
----
* AirborneMook: Obviously, given they were designed after flying insects.
* AnimalMecha: They're human-sized mechanical flies.
* BewareMyStingerTail: They have scorpion-like tails equipped with a wide variety of weapons. One of them uses it to inject Godzilla with a tranquilizer, while another attaches a neurotransmitter that allows Cameron Winter to control Godzilla.
* MechaMooks: Compared with most of Godzilla's opponents, the Cyber Flies are definitely lacking in the personality department, since the focus of their episode is Cameron Winter taking control of Godzilla, with the Cyber Flies just being a means to that end.
* ShockAndAwe: The Cyber Flies show the ability to fire bolts of electricity as a ranged attack.
[[/folder]]

[[folder: Mutant Rat]]
!!!'''Debut:''' "Cat and Mouse"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/giant_rat.png]]

A large number of giant rats that appear in large burrows beneath the New York Subway System. They are confronted by a group of amateur monster hunters as well as H.E.A.T. and Godzilla, for whom the rats are his natural prey. The rats' underground nest is eventually sealed off from the Subway and flooded by Godzilla, though the Big Rat later reappears as part of the Leviathan Aliens' monster army.
----
* AttackAttackRetreatRetreat: They pursue Godzilla down one of his tunnels, until they see that he's tunneled directly into the Hudson River, flooding the rats' nest.
* BaldOfEvil: Both the medium-sized rats and the big one are hairless.
* BullyingADragon: The rats are hardly a threat to Godzilla, but they continue to clutch onto him despite his immense size. Especially since they went after him when he gets the idea to use the Hudson River to flood their lair. They realize their folly when a flood of water starts to rush into their lair and drowns most of them.
* ExtraEyes: The big rat has six eyes that [[GlowingEyes glow in the dark]].
* TheGoomba: The Game Boy Color adaptation of "Monster Wars" features the mutant rats as a recurring enemy for Godzilla to fight in between the bosses.
* KingMook: The big rat, being roughly the size of a large van and having a much stockier build than its smaller counterparts.
* KillItWithWater: After sealing off the rat's nest from the rest of the subway, Godzilla burrows into the Hudson River, flooding the rats' lair and presumably drowning most of them.
* LeanAndMean: The smallest rats are much slimmer than the larger rats, but just as vicious.
* RodentsOfUnusualSize: The Rats comes in different sizes: small, medium and a big one. Note that even the "small" ones are the size of horses.
* ScaryTeeth: Their mouths are filled with jagged, misshapen teeth. At least one of the rats shows the ability to chew through the side of a van.
* WhatHappenedToTheMouse: Despite being part of the Leviathan Aliens’ monster army, the big rat has never been seen again after being sent out. Either it has somehow escaped them or had been killed off-screen.
* YouDirtyRat: They're mutated rats the size of horses that have started [[ToServeMan attacking people]].
[[/folder]]

[[folder: Crackler]]
!!!'''Debut:''' "What Dreams May Come"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/crackler.png]]

The Crackler is an electromagnetic projection kaiju created from the dreams of a repressed man named Sydney Walker while he was undergoing Theta-wave therapy for his insomnia. As a result, the Crackler acted on the man's pent-up aggression, targeting his neighbors' apartment and his place of work. Even after Walker is woken up, the Crackler continued his rampage until Randy provoked Sydney into losing his temper, releasing all of his repressed rage and leaving the Crackler too weak to fight back against Godzilla.
----
* AxCrazy: Actually subverted in the beginning, as the Crackler specifically targets locations that are the subject of Sydney Walker's suppressed rage, and leaves other locations untouched (even Walker's own apartment). Gets DoubleSubverted later on, though, as after they disconnect Walker from the machine that serves as a conduit, it just starts blindly attacking everything around it.
* {{Expy}}: A dream monster that controls electricity? Same concept as Gabara of ''Film/AllMonstersAttack'', but much better executed.
* ExtraEyes: It has six eyes on stalks along the sides of its heads.
* GigglingVillain: Makes a noise that sounds a lot like laughter. Could easily have been named the Cackler.
* HoistByHisOwnPetard: The Crackler gets killed by the charged [[https://en.wikipedia.org/wiki/Unisphere Unisphere]] it had originally threw at Godzilla, only for Godzilla to send it back with his power breath.
* LeanAndMean: The Crackler has a rather lanky physique and is one of the only deliberately malicious monsters in the series.
* ThePowerOfHate: It's strength and weakness. Once its master releases all his suppressed rage, it was easy pickings for Godzilla.
* PunnyName: Has electrical powers and cackles a lot.
* ShockAndAwe: The Crackler has a variety of electric attacks, probably based on its master's occupation as an [=MTA=] worker charging the city's electric buses.
* {{Tulpa}}: The personified frustration of an emotionally repressed Sydney Walker. It acts on the anger he's too meek to express and targets the people and things that inspired it.
* WhosLaughingNow: Probably why it sounds like it's laughing, as it's acting on Sydney Walker's repressed emotions.
[[/folder]]

[[folder:Cryptocledius]]
!!!'''Debut:''' "Leviathan"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/cryptocleidus.png]]

While H.E.A.T. was descending in a minisub to investigate the Leviathan spaceship, a pair of prehistoric sea creatures identified as Cryptocledius attacked their vessel until Godzilla managed to fend them off. Later, as H.E.A.T. was making their escape from the sunken spaceship, the Cryptocledius again attacked their escape pod, but Godzilla again intervened, subduing both with a rock slide. One of the sea monsters would reappear in the "Monster Wars" three-parter, and was deployed to attack Hong Kong by the Leviathan aliens. After breaking free of their control, it rebels against its former masters, only to be killed off.
----
* AmbiguousSituation: While its generally regarded as having been killed off at the end of "Monster Wars" since it never reappeared, it wasn't shown being directly hit by the Leviathan aliens' weapons and could have just as easily disappeared into the sea.
* BitPartBadGuys: The Leviathan Aliens are the real antagonists of their debut episode, with the Cryptocledius only showing up to threaten the H.E.A.T. team during their trips to and from the sunken spaceship. Their only real role in the story is to give Godzilla something to do, since he can't fit on the Leviathan ship.
* InformedSpecies: There's a real plesiosaur genus known as ''Cryptoclidus'', but this monster only very remotely resembles the actual animal.
* KilledOffForReal: When the aliens' mind control over him is broken, he fights back against his former masters. It doesn't go so well.
* MakeMeWannaShout: In the video game ''Godzilla: The Series- Monster Wars'', it gains an underwater sonic attack.
* MultiArmedAndDangerous: The Cryptocledius has six limbs: two sets of flippers for underwater propulsion, and a set of clawed forelimbs that it uses to crawl onto land.
* PrehistoricMonster: It's a prehistoric marine reptile that has inexplicably survived to the modern day, rather than being another mutation (although given its proximity to the Leviathan ship and their propensity for genetically engineering monsters from dinosaur DNA, it could have been mutated by them to protect their ship from external threats).
* RecurringCharacter: Comes back for the "Monster Wars" trilogy.
* SeaMonster: Its much bigger than any known marine reptile. Concept art shows it to be large enough to lift the H.E.A.T. Seeker out of the water.
* SkullForAHead: Although it doesn't seem to be actual bone, the mutation seems to have given them skull-like faces.
* SpikesOfVillainy: It has rows of spikes down its back and horn-like projections along the back of its jaw.
* StockNessMonster: Cryptocledius is a mutant plesiosaur.
* VertebrateWithExtraLimbs: They're plesiosaurs with six pairs of limbs total, two pairs of flippers, and a pair of clawed arms in front.
* WhatHappenedToTheMouse: When the Cryptocledius first appeared there were two of them but there was only one shown in the Monster Wars three-parter.
[[/folder]]

[[folder:Reptilians]]
!!!'''Debut''': "Leviathan"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/reptilian.png]]

The Reptilians are a group of quadrupedal bear-sized monsters created by the Leviathan aliens to serve as guard dogs aboard their ship.
----
* AttackAnimal: Dr. Preloran even refers to them as "guard dogs".
* BodyHorror: Their jaws open sideways, revealing a pair of tongues covered in tendrils, as well as multiple tentacles they use to ensnare their prey.
* CombatTentacles: The Reptilians are able to project numerous tentacles from their mouths that can extend considerable distance. Their primary means of attack seems to be binding intruders from a distance.
* {{Cyclops}}: They have what appears to be a single red eye in the center of their foreheads.
* MixAndMatchCritters: They are genetically engineered from ancient dinosaur DNA to serve as guard dogs for the Leviathan aliens.
* RaptorAttack: They have raptor-like claws on their forelimbs and operate in packs. Not surprising, given they are genetically engineered from dinosaurs specifically to serve as alien guard dogs, so incorporating raptor DNA would make sense.
* SpikesOfVillainy: They have rows of spikes running down their backs, as well as stegosaurus-like spikes on their tails.
[[/folder]]

[[folder:Queen Bee]]
!!!'''Debut:''' "Hive"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/mutant_bee_queen.png]]

When H.E.A.T. was sent to investigate reports of giant carnivorous plants on the volcanic island of Santa Marta, Craven and Monique discovered a giant beehive in the hotel, with Nick and Elsie reasoning that the plants were mutated by irradiated ash, whose pollen mutated the bees who then further spread the mutation to other plants. Both the plants and the bees are killed off when the volcano erupts again, though the Queen survived and reappeared as one of the pawns of the Leviathan aliens. After being deployed to Moscow, the Queen Bee would turn on her masters after their control beacon was destroyed, though she was shot down.
----
* ArtisticLicenseBiology: Her drones shoot their stingers at the protagonists at some point. In real life, the stingers hold the bees' internal organs altogether, but when they are removed, it's a death sentence for the poor bee.
* BeeAfraid: She is a gigantic bee.
* BigCreepyCrawlies: Again, she's a giant bee.
* BuriedAlive: Queen Bee seemingly meets her end when Godzilla buries her deep within an underground chasm at the end of "Hive," but we later find out she survived.
* TheCameo: In the later episode "Trust No One", one of the forms the DNA Mimic takes is a giant bee identical to one of the mutant drones.
* FlunkyBoss: In the video game, the Queen is able to summon more drones to attack Godzilla.
* FoodChainOfEvil: The Bees have a dark example of symbiosis with the radioactive planets. The plants provide the bees with sustenance and the bees spread the plants' seeds throughout the island and eventually the world.
* GiantFlyer: She and all of her drones are kaiju-sized bees.
* HiveMind: A ''bee'' hive mind, naturally.
* KilledOffForReal: When the aliens' mind control over her is broken, she fights back against her would be controllers. It doesn't go so well.
* LargeAndInCharge: The bus-sized Queen dwarfs her car-sized drones.
* MakeSomeNoise: In the Game Boy Color game, the Queen Bee has the ability to create damaging sound waves from her wings.
* RecurringCharacter: Comes back for the "Monster Wars" trilogy.
* ShoutOut: The way the bees' ecosystem is created from a volcano is similar to Film/TheBlackScorpion.
* SpikeShooter: The drones are able to shoot their stingers at enemies. The Queen takes it a step further by being able to rapidly shoot multiple stingers like a machine gun.
* UnexplainedRecovery: She gets buried alive inside of a volcano moments before it erupts, yet returns in "Monster Wars", seemingly none the worse for wear.
[[/folder]]

[[folder:Santa Marta Plant]]
!!!'''Debut:''' "Hive"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/santa_marta_plant.png]]

After a volcano erupted on the island resort of Santa Marta, H.E.A.T. was sent to investigate reports of giant carnivorous plants that had attacked a group of looters attempting to steal valuables from the resort's hotel. During their investigation, the team was repeatedly attacked by these mutated plants, which Elsie reasons were created by irradiated ash caused by the island's former use as a secret nuclear testing site. The plants in turn were responsible for creating the island's giant bees, who then further spread the mutation to other plants. Both the plants and bees were killed off when the volcano erupts again.
----
* BotanicalAbomination: They are giant vines that actively tunnel underground and attack anyone that gets close.
* FoodChainOfEvil: Their pollen acts as a food source (and mutagen) to the island's giant bees, who in turn spread the mutation to other plants.
* ManEatingPlant: While they don't explicitly try to eat anyone, the fact that they seem to deliberately target living things seems to indicate that they are carnivorous in nature.
* VineTentacles: The plant's primary means of attack is to bind anything that gets within grabbing range. The vines are even strong enough for a large number of them to restrain Godzilla.
[[/folder]]

[[folder:Quetzalcoatl]]
!!!'''Debut:''' "Bird of Paradise"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/quetzalcoatl_15.png]]

A giant prehistoric bird of prey, Quetzalcoatl appears in a Mayan step pyramid and begins attacking nearby villages. H.E.A.T. attempts unsuccessfully to subdue the monster until it carries off Elsie. The rest of the team theorizes that Quetzalcoatl, or "Q" as they nickname it, has a nest nearby. After they locate the nest in a volcano, H.E.A.T. signals Godzilla to aid them while they rescue Elsie. Quetzalcoatl is defeated and it and its young are sent plummeting into the volcano.
----
* BreathWeapon: Fires a large stream of fire as well fireballs.
* DisneyVillainDeath: Q and her offspring were last seen plummeting back into the volcano. Given that the species had survived centuries inside the volcano, it's possible they are fine.
* {{Expy}}: Of Rodan.
** The babies are very likely based on the ''Velociraptors'' from ''Film/JurassicPark'', even using the same sound effects.
* ExtremophileLifeforms: It's feathers have a molecular composition similar to silicon, allowing it to withstand temperatures of up to 2,000° F. As a result, Q is able to nest comfortably inside an active volcano.
* GiantFlyer: Q is a gigantic prehistoric bird of prey.
* KidnappingBirdOfPrey: It carries off Elsie and attempts to feed her to its young.
* MamaBear: Q is only attacking humans in order to protect her babies or feed them.
* NoSell: Its feathers have a silicate coating that shield them from the extreme temperatures of volcanos. This also protects her from conventional weaponry and Godzilla's atomic breath.
* PlayingWithFire: Q is able to breath streams of fire as a ranged attack.
* PrehistoricMonster: It resembles a giant Archaeopteryx or other prehistoric bird
* ShoutOut: It has many similarities to the Firebird from ''WesternAnimation/TheGodzillaPowerHour'': both are female [[{{Expy}} expies]] of Rodan, nest in volcanoes, and comes into conflict with Godzilla while trying to care for its young.
* ToServeMan: Q carries off Elsie as food for her chicks.
[[/folder]]

[[folder:Nessie]]
!!!'''Debut:''' "Dead Loch"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/nessie.png]]

Nick and Elsie see a news report from Scotland detailing an alleged attack by the Loch Ness Monster, which Nick dismisses as a hoax meant to drum up tourism. However, when H.E.A.T. investigates the loch, they soon learn that Nessie is very real, with Nick and Elsie theorizing it is a prehistoric sea creature that had been living in Loch Ness since the lake became separated from the ocean. Later, the team discovers that the institute attacked by Nessie is harboring her offspring. After Godzilla frees her baby, the two monsters part ways amiably.
----
* AntiVillain: She only attacks humans because her baby went missing. Once Godzilla sees how desperate she is to find her baby, he decides to help her.
* EnemyMine: Though Nessie and Godzilla fight at first, once he realizes she's trying to save her baby, he quickly helps her in the rescue.
* {{Expy}}: Of Manda, being a sea monster that resembles a serpentine dragon.
* GiganticAdultsTinyBabies: Nessie's baby is much closer to humans, size-wise, than its mother is.
* GracefulInTheirElement: A far better swimmer, and is able to temporarily knock out Godzilla in lake Loch Ness.
* InformedSpecies: Stated to be a mosasaur, but looks more like a generic sea serpent than any real animal, never mind a mosasaur.
* MamaBear: Nessie's attacks on Dr. Trevor's facility are because he's holding her baby captive for scientific purposes.
* MonsterIsAMommy: It's a normally peaceful animal that's lived in the Loch without incident for centuries, but it suddenly begins causing trouble because its baby has been kidnapped.
* SeaMonster: Well, technically she's a lake monster. That doesn't change the fact that she's a Godzilla-sized sea serpent that suddenly goes on the warpath when her baby is taken from her.
* StockNessMonster: The one and only, though she's more of a sea serpent type than the usual plesiosaur.
* RidingIntoTheSunset: In a rarity for this series, Nessie and her baby are allowed a happy ending and remain in the Loch.
[[/folder]]

[[folder:Robo-Yeti]]
!!!'''Debut:''' "Competition"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/robo_yeti.png]]
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/robo_yeti_2.png]]

A giant mechanical ape, the Robo-Yeti first appears to be another mutation until its fur and skin are burned away by Godzilla's atomic breath. It's then revealed to be an anti-mutation weapon built for the Japanese Self-Defense Force (JSDF). Although antagonistic towards Godzilla due the mistaken belief that he is responsible for several hikers going missing, it is soon confronted by the actual perpetrator, the King Cobra. After being quickly defeated by the gigantic snake, the Robo-Yeti is quickly repaired and teams up with Godzilla to pursue the King Cobra to Tokyo, although the King Cobra quickly destroys it yet again.
----
* AnimalMecha: A giant mechanical ape disguised to look like a monstrous yeti.
* BarbarianLonghair: The Yeti's furry disguise includes a long mane of hair on top of its head.
* BareFistedMonk: Initially, the Robo-Yeti fights Godzilla solely through hand-to-hand combat, showcasing its martial arts prowess. Once it's cover is blown, however, the robot drops all pretense and just switches over to its weapons systems.
* BigfootSasquatchAndYeti: It's meant to resemble a kaiju-sized yeti, until Godzilla [[RoboticReveal destroys its disguise]].
* ChestBlaster: It has missile launchers built into its chest.
* CranialProcessingUnit: The Robo-Yeti is incapacitated when the King Cobra repeatedly bites its head, damaging its processing unit and requiring a replacement circuit card from N.I.G.E.L.
* CurbStompBattle: It never goes well for Robo-Yeti whenever it goes up against King Cobra, with the most it manages to do was yank the snake off Godzilla when it was trying to crush him, allow Godzilla enough time to recover and defeat it.
* EnemyMine: Though it fights Godzilla at first, once King Cobra appears on the scene, the machine becomes a reluctant ally to the lizard.
* HumongousMecha: Created by Dr. Ifukube to defend Japan from giant monsters.
* KingKongCopy: It is meant to look like a giant ape.
* MacrossMissileMassacre: Although not to the extent of most giant robots, the Robo-Yeti does pack a large payload of missiles in its chest.
* ManBitesMan: It bites Godzilla's neck while grappling with him.
* MechVsBeast: The Robo-Yeti was built by Dr. Ifukube to defend Japan from the growing number of mutations that started springing up after the events of the film.
* MythologyGag: Robo-Yeti is initially covered in a fake skin to make it seem as though it is a real gigantic primate of some kind, just like Showa Mechagodzilla was disguised as Godzilla in ''Film/GodzillaVsMechagodzilla''. Also like Mechagodzilla, Robo-Yeti's disguise is ruined thanks to Godzilla's atomic breath.
** The idea of a giant primate fighting Godzilla goes all the way back to the 1962 ''Film/KingKongVsGodzilla'' film, and the mechanical nature of Robo-Yeti might be a shout-out to [[Film/KingKongEscapes Mechanikong]].
* OffWithHisHead: Its second encounter with King Cobra, it gets constricted so hard that its head breaks off, along with one of its arms.
* RedEyesTakeWarning: In both of its forms, it has red eyes. After it is revealed to be a robot, it's eyes also [[GlowingEyes have a noticeable glow]].
* {{Robeast}}: A giant mecha built in the likeness of a giant ape.
* RoboticReveal: After Godzilla sets its fur on fire with his atomic breath, the Robo-Yeti emerges from the flames, showing off his true form.
* ShockAndAwe: Robo-Yeti can shoot electric cables from its hands to electrocute opponents (similar to [[Film/GodzillaVsMechagodzillaII Heisei Mechagodzilla's Shock Anchor]]).
* TerminatorImpersonator: Everything from its fake organic exterior, skeletal robotic body, glowing red eyes, and its RoboticReveal being done via OutOfTheInferno are all likely nods to the [[Film/TheTerminator T-800]].
* UndignifiedDeath: It doesn't put up much of a fight against the King Cobra before the giant snake gets hold of it, squeezing Robo-Yeti's head and arm off in the process.
* WalkingArmoury: In addition to its mastery of the martial arts, the Robo-Yeti has built-in missile launchers, electrified cables it can launch from its hands, and nozzles in its fingertips (while these were only used to spray a chemical to counteract King Cobra's adhesive spit, it's not hard to imagine these could be used for more offensive liquids).
* WalkingSpoiler: Its name alone spoils its own RoboticReveal.
* WeCanRebuildHim: After the King Cobra is defeated, Dr. Ifukube asks for Craven's advice on rebuilding the Robo-Yeti.
* TheWorfEffect: Despite managing to get the better of Godzilla when they first fight, it ends up being reduced to this in the fights with the King Cobra.
[[/folder]]

[[folder:King Cobra]]
!!!'''Debut:''' "Monster Wars: Part 1" [First appearance by release date]; "Competition" [First chronological appearance]
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/kingcobra.png]]

The King Cobra first appeared near Mount Fuji, abducting local hikers. Both H.E.A.T. and the JSDF investigated the disappearances, leading to conflict between Godzilla and the JSDF's Robo-Yeti, before King Cobra appeared, blinding Godzilla and disabling the mechanical ape. After making its way to Tokyo, it is again confronted by Robo-Yeti and Godzilla, leading to the serpent's defeat. King Cobra would later reappear in the "Monster Wars" trilogy as part of the Leviathan Alien's monster army, who deployed him to attack Paris. After their control beacon was disabled, King Cobra rebelled against its former masters, but was quickly incapacitated. It was later captured and became part of the Mutant Research Facility on Monster Island for the remainder of the series.
----
* BadFuture: In an alternate future in which the world was overrun by genetically engineered monsters known as Dragmas, King Cobra was released from Monster Island to fight them, but was slain in battle against the creatures.
* ConflictKiller: His appearance forces a temporary alliance between the J.S.D.F.'s Robo-Yeti and Godzilla, who had previously been at odds with one another.
* CurbStompBattle: King Cobra takes out Robo-Yeti pretty quickly in both of their fights, the second time squeezing the machine so hard that its neck breaks and its arm pops off.
* MisplacedWildlife: He's located in Japan, even though no species of cobra live in Japan; it is possible he may have migrated from Southeast Asia, though that does beg the question how he was not spotted til then.
* RecurringCharacter: Comes back for the "Monster Wars" trilogy, then later "SCALE."
* SnakesAreSinister: He's a gigantic cobra, though it is downplayed in that he's not portrayed as any more malevolent than the other monsters, and is stated to just be seeking food like any other animal.
* SpikesOfVillainy: It has spikes extending from both sides of its hood, and another row of spikes running down its spine.
* SuperSpit: He can spray an adhesive gunk from his mouth. He puts this to good use when he blinds Godzilla for almost the entirety of the episode.
* ToServeMan: It attacks people and is sticking them to the walls of its lair as a food source for winter.[[note]]There's a little bit of ArtisticLicenseBiology here, as snakes don't store food during the winter, rather, they hibernate (snakes can naturally go many months without eating, so there isn't much point in storing food).[[/note]]
* TunnelKing: Surprisingly adept at burrowing for a cobra.
[[/folder]]

[[folder:The Giant Bat]]
!!!'''Debut:''' "Monster Wars: Part 1"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/giant_bat.png]]

The Giant Bat appears in Nigeria, terrorizing the countryside as it raids livestock from local farms. Nick and Godzilla arrive in Nigeria to confront it, but it eventually flies off when the Leviathan Aliens take control of it. Monique and Randy pursue it in the Heat-Seeker, eventually following it to Site Omega, where they discover that most of Earth's monsters have been assembled there. The Bat is deployed to Paris alongside King Cobra. After the Leviathan aliens' control beacon is disabled, the Giant Bat began to perceive the alien spaceships as intruders on its territory and attacked. Eventually, it returned to Site Omega and was defeated by Cyber-Godzilla. Once the Leviathan Aliens' invasion was defeated, the Giant Bat was captured and became part of the Mutant Research Facility on Monster Island for the remainder of the series.
----
* AmbiguousSituation: The last time the Bat was seen, he was laying on the ground motionless following a battle against both Godzilla and Skeetera making it unknown whether or not he was merely unconscious or killed from the fight. While Audrey states that the mutations have been secured, only footage of C-Rex and King Cobra were shown back in their habitats.
* BatOutOfHell: Its a giant mutated bat large enough to carry off two full-grown oxen.
* CurbStompBattle: The Bat is the only of the Earth monsters aside from Godzilla to stand up against Cyber-Godzilla... and he is immediately defeated when Cyber-Godzilla reflects his own sonic scream back at him.
--> '''Elsie:''' "Yippee."
* ExactlyWhatItSaysOnTheTin: He's a giant bat.
* {{Expy}}: Of the bat kaiju Bagorah from Creator/DarkHorseComics ''Godzilla, King of the Monsters'' series, having similar physical features and a sonic attack.
* GiantFlyer: Naturally.
* LogicalWeakness: Being a bat, it is highly dependent on its echolocation, so anything that compromises it seriously effects its ability to navigate.
* RecurringCharacter: Comes back for "SCALE."
* SuperScream: The Bat can unleash sonic screams as his main form of attack. In "SCALE," we see that the military has fitted him with an electronic collar so that he can't use his screams while on Monster Island.
[[/folder]]

[[folder:Cyber-Godzilla Sr.]]
!!!'''Debut:''' "New Family: Part 1" [as Godzilla]; "Monster Wars: Part 2" [as Cyber-Godzilla]
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/cyber_godzilla_2.png]]

After having been killed at the end of ''Film/Godzilla1998'', Godzilla Sr.'s body was transported to Sandy Point Military Base. When the Leviathan Aliens launched their plan to conquer the Earth, she was resurrected as Cyber-Godzilla, and immediately came into conflict with her son. However, her son hesitated to attack her, allowing the Leviathan Aliens to place Godzilla under mind control. The two monsters travelled to Site Omega with the rest of Earth's monsters, with Cyber-Godzilla being deployed to Tokyo. After the Leviathan Aliens' mind control beacon was destroyed, Cyber-Godzilla was the only monster to remain under alien control and was recalled to Site Omega to take out H.E.A.T. Once there, she easily defeats the Giant Bat and again confronts her son, who turns against her and kills Cyber-Godzilla once and for all.
----
* [[ArchnemesisDad Archnemesis Mom]]: She's Godzilla Jr.'s biological parent, but the two eventually become mortal enemies.
* ArtificialLimbs: Her right arm is completely replaced by a robotic limb.
* AttackReflector: She has a dish built into her chest that is able to reflect the Giant Bat's sonic attack back at him.
* BackFromTheDead: She's the Godzilla from the film the series spun off of, and was killed at the finale of said film. The Leviathan aliens resurrect her as a cyborg in "Monster Wars."
* BodyHorror: Aside from her cybernetic implants, her body is visibly decaying. Her spines are grayed, her body is browning, and a lot of her teeth are missing. Her roar has degenerated into an undead moan. It is easier to see how different she is from her son when they are in the same frame.
* BreathWeapon: Somehow has one when she became a cyborg. She didn't actually ''have'' one in the film (where it was more of a wind blast roar that could catch fire from cars or flammable exploding). Also, it's the traditional blue compared to her son's green.
* CameBackStrong: Is ''much'' stronger than it originally was due to the cybernetic enhancements.
* CompositeCharacter: While she's most overtly based on Mechagodzilla, being a cybernetic counterpart to Godzilla with additional weapons, she also borrows heavily from both the Showa and Heisei versions of King Ghidorah. She serves as the Leviathan Aliens' most powerful asset in "Monster Wars" (a WholePlotReference to ''Film/DestroyAllMonsters''), fulfilling the same role as the Showa King Ghidorah, and she was a creature mutated by radiation, who gets unceremoniously killed and resurrected as {{Cyborg}} just to get killed again, following the same character arc of the Heisei Era's King Ghidorah.
* CurbStompBattle: Cyber-Godzilla defeats the Giant Bat in a single blow. She's on the receiving end of one from her son, barely even managing to touch him.
* {{Cyborg}}: The body of the first Godzilla fitted with a number of cybernetic enhancements.
* DefiantToTheEnd: Despite being clearly outmatched by his son, he continues to fight until his cybernetics are ripped out of him.
* TheDragon: To the aliens, proving to be their strongest monster in their invasion. Since it was controlled through cybernetic implants he stayed on their side when the mind control over Earth's monsters was broken.
* EveryoneCallsHimBarkeep: Cyber-Godzilla is never referred to by that name in the series. The Leviathan aliens simply refer to her as "the cyborg", while Nick calls her "Godzilla's daddy".
* {{Expy}}: Of Mechagodzilla. Interestingly, this comes full circle in ''Film/GodzillaAgainstMechagodzilla'', wherein Kiryu is literally built around the remains of the original Godzilla.
* FamilyUnfriendlyDeath: Her fight with Godzilla ends with him getting her arm torn off, her chest ripped open and the vital circuitry inside ripped out.
* FinalBoss: Of the video game ''Godzilla: The Series- Monster Wars''.
* FlawedPrototype: In spite of her upgrades, Cyber-Godzilla is clearly a weaker monster than her son, as she is defeated after failing to land a single blow on Godzilla, even with assistance from the Leviathan aliens.
* GenderFlip: Despite being referred to as male in both the movie and the animated series, the video game ''Godzilla: The Series- Monster Wars'' specifically refers to Cyber-Godzilla as female.
* HellIsThatNoise: her roar is deeper and more mechanical than her son's, the end result sounding more like an undead moan than anything else.
* LogicalWeakness: Given that her body appears to have partially decayed and she has to carry around the added weight of her cybernetics, it should come as no surprise that she doesn't have the same mobility as her son.
* LongRangeFighter: All of his weapons are designed to attack from a distance. When she does try to engage her son in melee combat, the younger Godzilla is able to easily outmaneuver him.
* LukeIAmYourFather: she uses her relation to Godzilla Junior to manipulate him more than once.
* MacrossMissileMassacre: Although she uses them more conservatively than her Mechagodzilla expies, with beam weapons being the preferred choice.
* MythologyGag: Her atomic breath is blue, like the classic Godzilla, as opposed to his son's green. She is sent to destroy Tokyo, the scene of most Godzilla films.
* NinjaPirateZombieRobot: She's an undead mutated kaiju-sized iguana cyborg.
* PostFinalBoss: She's the main antagonist of the Monster Wars trilogy, and after she's defeated, more monsters crop up after the Leviathans' invasion.
* ReforgedIntoAMinion: The Leviathan Aliens orchestrate her resurrection as a cyborg to serve as their most powerful weapon against Earth's forces.
* TookALevelInJerkass: In the film, Godzilla Sr. was just a mutated animal just trying to live out her natural life cycle, generally ran from a fight when she could, and only deliberately attacked people when provoked. After being rebuilt as a cyborg, she intentionally causes destruction under the Leviathan aliens' command.
* TruerToTheText: Ironically, becoming a cyborg actually addressed many of the issues that made her "Godzilla InNameOnly": the lack of [[BreathWeapon atomic breath]], her tendency to run from a fight, and her vulnerability to conventional weaponry.
* UndeadAbomination: The body of giant mutated iguana brought back to life (with the BodyHorror that implies) with cybernetic enhancements specifically to be TheDragon to an alien invasion.
* UnfriendlyFire: Her robotic arm is accidentally blown off by a Leviathan fighter aiming for Godzilla Junior.
* WalkingArmoury: Not to the extent of most mechanical monsters, Cyber-Godzilla still has multiple missile launchers attached to her dorsal plates and a cybernetic dish inside her chest that can reflect sound-based attacks back at their source. She also has atomic breath, something she lacked pre-cybernetics.
* [[WeCanRebuildHim We Can Rebuild Her]]: After being shot down by F-18's on the Brooklyn Bridge, a group of scientists controlled by the Leviathan aliens rebuild her as a cyborg.
[[/folder]]

[[folder:Ice Borer]]
!!!'''Debut:''' "Freeze"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/ice_borer.png]]

The Ice Borers are mutated moles that burrow through the Antarctic ice in search of food to fuel their high metabolism. They first appear to attack a group of researchers searching for oil deposits in Antarctica. Although the disappearances are blamed on geological tremors, Nick suspects a mutant is responsible and H.E.A.T. travels to investigate.
----
* BigEater: The Ice Borer's extremely high body temperature requires them to constantly seek out food to keep up with their high metabolism.
* {{Expy}}: Possibly of Baragon, given that it is a burrower with heat-based powers.
* ExtremeOmnivore: When the [=HEAT=] team arrives, any trace of animal life are all gone.
* {{Irony}}: H.E.A.T. uses improvised [[FreezeRay freeze rays]] to defeat the Ice Borers, creatures specially adapted to life in the Antarctic. Randy even lampshades the absurdity of the plan.
* KillItWithIce: H.E.A.T. determines that the Ice Borer's abnormally high body temperature is crucial to their survival, so they create liquid nitrogen weapons to lower their temperature.
* KryptoniteFactor: The cold.
* MisplacedWildlife: The Ice Borers are mutated moles, animals not native to Antarctica.
* MyBloodRunsHot: They are able to rapidly tunnel through the ice due to their unusually high body temperatures. H.E.A.T. is able to weaken them using liquid nitrogen to cool their bodies off, making them vulnerable to the cold.
* ShoutOut:
** They're based on an April Fool's Day from a 1995 issue of ''Discovery'' magazine, about a newly found species of penguin-hunting Antarctic naked mole-rate, described as "hotheaded naked ice borers", which these fit to a T (except for the "naked" part).
** Their ability to tunnel and their tendency to drag their prey underground are likely a reference to the Graboids from ''{{Film/Tremors}}''.
* TunnelKing: They can rapidly burrow through the ice using their own body heat.
* {{Wormsign}}: The first indication of their approach is the snow shifting while they pass beneath it.
[[/folder]]

[[folder:Giant Mutant Termite]]
!!!'''Debut:''' "Bug Out"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/giant_mutant_termite.png]]

H.E.A.T. is sent to South America by the United Nations to discover what is destroying large areas of the Amazon Rainforest. They discover a hive of giant mutated termites are responsible and are consuming trees at a rate that will completely level the entire forest within three weeks if something is not done to stop them.
----
* BigCreepyCrawlies: They're gigantic termites. The soldiers are roughly the size of horses, while the queen is as large as a house.
* {{Expy}}: They are very similar to the Queen Bitch and her termite-like offspring from the unmade sequel to ''Film/Godzilla1998''. Possibly unintentional as the episode aired while ''Script/Godzilla2'' was still in pre-production (Roland Emmerich and Dean Devlin would both drop out of the project the same month, with the film being scrapped shortly afterwards).
* LargeAndInCharge: The queen is significantly larger than the other termites.
* LetsYouAndHimFight: Craven uses ultrasonic transmitters to simulate an attack signal, causing the termites to turn on one another long enough for H.E.A.T. to enter the termite mound and set up a bomb in the egg chamber.
* TermiteTrouble: They threaten to wipe out the entire Amazon Rainforest in a few weeks if not stopped.
* ZergRush: What they lack in size (compared to other monsters anyway), they make up for in sheer numbers. A swarm of soldiers is even able to force Godzilla into temporarily retreating.
[[/folder]]

[[folder:Giant Mutant Widow Spider]]
!!!'''Debut:''' "Web Site"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/giant_mutant_widow_spider.png]]

The Giant Mutant Widow Spider is [[ExactlyWhatItSaysOnTheTin a giant mutant black widow]] with thousands of tarantula-sized offspring that have largely overrun a tropical island, threatening a military base on the island.
----
* DeathByIrony: The Widow and her babies ends with them being paralyzed for good.
* {{Expy}}: Of Kumonga and other GiantSpiders.
* GiantSpiders: The babies range in size from slightly larger than a tarantula to roughly human-sized. The adult is nearly as large as Godzilla.
* KryptoniteFactor: The pollen of one local flower instantly paralyzes them. H.E.A.T. fashions a bomb filled with the flowers to take out all of the spiders while they're all in one place.
* MotherOfAThousandYoung: She has hundreds, if not thousands, of offspring and can reproduce more asexually, creating an entire army of mutant spiders.
* NoSell: According to Elsie, the spiders are immune to most pesticides.
* TheParalyzer: They render their prey immobile with their venomous bites to eat them.
* ProjectileWebbing: What else would you expect from a gigantic spider monster?
* ShoutOut: Ironically, the climax of the episode is basically the same as that of [[Film/Godzilla1998 the movie]]: the heroes trying to locate the nest of a mutant that reproduces asexually to take out the offspring before they can escape and overpopulate the rest of the world.
* SpiderSwarm: The infants attack in large numbers, quickly overwhelming a group of well-armed soldiers.
* TrulySingleParent: The Widow reproduces asexually.
[[/folder]]

[[folder:Chameleon]]
!!!'''Debut:''' "An Early Frost"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/chameleon_0.png]]

The Chameleon is a clone of Godzilla created by Cameron Winter to frame the real Godzilla and kill him after public opinion turned against him.
----
* BellyMouth: The Chameleon has a large, gaping mouth across its upper torso alongside its upper mouth.
* BioweaponBeast: Created from Godzilla's DNA to frame him and ultimately kill him so that Cameron Winter could sell others like him as living weapons.
* BodyHorror: Chameleon's has a head consisting of three finger-like appendages with eyes on the sides, and a gaping mouth on his chest.
* EvilKnockoff: Explicitly stated to be cloned from Godzilla for the purpose of [[FrameUp framing him]] and [[EngineeredHeroics then killing him]].
* FrameUp: Created from Godzilla's DNA for the express purpose of framing him.
* HollywoodChameleons: Able to blend in with its environment so well that it becomes practically visually invisible.
* MythologyGag: The Chameleon's signature ability is [[HollywoodChameleon his pseudo-invisibility]], an ability given to Godzilla in early drafts of [[Film/Godzilla1998 the film]].
* NoSell: Due to being created as an anti-Godzilla weapon, he is impervious to Godzilla's atomic breath.
* PrehensileTail: Just like its namesake, the Chameleon can use its tail as an extra limb to grasp objects and opponents with.
* ShoutOut: The Chameleon taking on Godzilla's appearance in order to frame him is likely a nod to Mechagodzilla's disguise in ''Film/GodzillaVsMechagodzilla''.
* SpikesOfVillainy: In addition to the same fin-shaped scutes as Godzilla, Chameleon has a number of spikes and bony protrusions extending from its arms.
* TakenForGranite: After Philippe hits it with the special serum meant for Godzilla via a specialized rocket.
[[/folder]]

[[folder:DNA Mimic]]
!!!'''Debut:''' "Trust No One"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/dna_mimic_elsie_chapman.png]]

The DNA Mimic is a shape shifting mass of pure genetic material created by Dr. Anton Fleurie as part of a hybridization experiment. It was left abandoned in the doctor's lab in the jungles of French Guinea. After being inadvertently released by a treasure hunter years later, it began roaming the jungles in search of its counterpart. H.E.A.T. is tipped off about the creature's existence by Phillipe Roaché and begin investigating the laboratory. While Monique is separated from the group, the DNA Mimic attacks her and later uses her form to coerce Randy into locating the other Mimic. It continues to shift forms between the different members of H.E.A.T. to keep them fighting amongst themselves while it searches for its mate. H.E.A.T. discovers that if the two combine, they will be able to reproduce, potentially replacing humans as Earth's dominant species. The Mimic is able to find the second barrel and merge with its mate, though Godzilla arrives to challenge it before it can do any harm. Nick is able to hit the Mimic with a dart containing an anti cellular mutagen, which weakens it long enough for Godzilla to finish it off.
----
* AllYourPowersCombined: In addition to taking on their appearances, the DNA Mimic can replicate the skills and physical abilities of people it imitates, such as Craven's programming skills.
* BlobMonster: In its natural form, the Mimic is nothing more than a gelatinous grey mass.
* DittoFighter: It is ably to copy the appearance and abilities of everything it touches, making it quite possibly the most versatile opponent Godzilla faces in the series.
* GlamourFailure: H.E.A.T. discovers that the DNA Mimic's body temperature is higher than a normal human, allowing them to identify Elsie as the Mimic in disguise.
* ItCanThink: As the episode progresses, the Mimic reveals it has a great display of tactical thinking, mechanical skills, as well as manipulation skills, possibly due to inheriting memories from its donors.
* KillAndReplace: It tries this on Elsie but failed.
* KryptoniteFactor: Elsie develops a chemical mutagen-nitric acid-specifically designed to rip the creature apart at the genetic level. While this doesn't kill the Mimic immediately, it does weaken it enough for Godzilla to finish it off.
* MiracleGroMonster: After the Mimic merges with its mate, it goes morphing into normal-sized creatures into Godzilla-sized ones.
* MultipleHeadCase: After being hit with a dart containing anti cellular mutagen, the Mimic [[SuperpowerMeltdown loses control]], assuming the form of a giant, deformed two-headed copy of Elsie.
* SealedEvilInACan: At the start of the episode, the DNA Mimic is sealed in a barrel in a backroom of a remote laboratory hidden in a South American jungle before a [[UnwittingInstigatorOfDoom treasure hunter]] accidentally releases it. Its counterpart is in a similar barrel at the bottom of a river several miles away.
* ShoutOut: The DNA Mimic is an obvious homage to ''Film/TheThing1982''.
* SnakesAreSinister: It uses the form of an anaconda to nearly kill Monique and absorb her DNA. After merging with its mate, its anaconda form is large enough to battle Godzilla.
* UnstableGeneticCode: It's stated to be composed of pure DNA, allowing it to change into anything whose DNA it absorbs.
* VoluntaryShapeshifting: It can take the appearance of anyone or anything whose DNA it absorbs through touch. Over the course of the episode, it assumes the forms of all five members of H.E.A.T., a rottweiler, anaconda, condor, panther, monkey, alligator, giant piranha, a giant bee, and Godzilla himself.
[[/folder]]

[[folder:Techno-Sentient]]
!!!'''Debut:''' "Juggernaut"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/techno_sentient_form_3.png]]

The Techno-Sentient is a mysterious organism from outer space that has the ability to fuse itself with any mechanical device it comes into contact with. After absorbing a number of electronics and construction equipment, it grows to Godzilla-like proportions. H.E.A.T. discovers it is tapping into the Internet to learn about humans, Earth, and the location of weapons of mass destruction. They pursue the monster to a nearby military base, where the Tecnho-Sentient is attempting to launch a nuclear missile to trigger a nuclear Armageddon. Godzilla is able to pin the Techno-Sentient to the missile, which Randy redirects to explode outside the Earth's atmosphere, destroying it.
----
* AliensAreBastards: An alien lifeform that comes seconds away from causing a nuclear war.
* AndIMustScream: It gets launched back into space by the very missile it was trying to use to start a nuclear war, incinerated when the missile detonates harmlessly beyond Earth's atmosphere.
* TheAssimilator: Of the non-organic variety; the Techno-Sentient grows bigger and gains new abilities as it continues to absorb more technology into its body.
* ChainsawGood: Attempts to kill Craven with a circular saw.
* CombatTentacles: It can extend tentacle-like cables to grab nearby machinery to be incorporated into its body or to restrain its adversaries.
* EldritchAbomination: Its body is an amorphous mass of flesh and tendrils with a single eyeball in the middle. It also happens to be one of the only monsters in the show who is overtly malicious, trying to wipe out humanity and take over the Earth for itself.
* {{Expy}}: Of Berserk, a scrapped kaiju from the unmade 1993 film, ''Godzilla vs. Berserk'', which would eventually be reworked into ''Film/GodzillaVsMechagodzillaII''. Both Berserk and the Techno-Sapient are alien lifeforms that assimilate machinery into themselves.
* FromNobodyToNightmare: In just a few hours, it goes from an alien life form the size of a child's toy into a Godzilla-sized mass of living machinery that comes within ''seconds'' of setting off a global nuclear war.
* GenericDoomsdayVillain: It was sapient, but it never communicated with the characters despite having the capacity to do so, so exactly why it wanted to cause a nuclear holocaust is unknown, as the most we get is Nick's unconfirmed theory that it wanted to eliminate all organic life and leave a world of only machines, which indicates some kind of FantasticRacism.
* HoistByHisOwnPetard: It ends up being destroyed by the same nuclear missile it was attempting to use to start WorldWarIII after Godzilla's constant beating the launch frame causes the frame to be wrapped around the Techno-Sentinent.
* HooksAndCrooks: After incorporating a construction crane into its body, the Techno-Sapient uses it as an improvised grappling hook and [[EpicFlail flail]].
* AnIcePerson: Assimilating a refrigerator into its body allowed it to launch ice shards as projectile weapons.
* ItCanThink: Compared to most of the monsters in this series, the Techno-Sapient is ''very'' cunning, using the Internet to locate a nuclear missile silo and targeting Baghdad in an attempt to start WorldWarIII.
* MiracleGroMonster: It continuously grows as it assimilates more machinery, going from the size of a RC car to as large as an ICBM in a relatively short period of time.
* NoSell: Despite being hit by several missiles, the Techno-Sentient is able to assimilate them into its body before they have the chance to detonate.
* ShoulderCannon: It briefly gains one when it assimilates a tank.
* TentacledTerror: It has cable-like tendrils extending from its body that it uses to assimilate technology into its body and to restrain opponents.
[[/folder]]

[[folder:Mutant Jellyfish]]
!!!'''Debut:''' "Future Shock"

A mutant jellyfish the H.E.A.T team hunts down along with Godzilla.
----
* AlienBlood: When Godzilla kills it, it bleeds out purple blood.
* ArtisticLicenseBiology: The thing does ''not'' resemble a jellyfish at all. If anything, it looks exactly like the Fire Monster from "Ring Of Fire", which was a fire bug. They even have the same vocal noises. The only difference between the two is that the Mutant Jellyfish is a fully aquatic monster.
* NonIndicativeName: Despite being called a "Mutant Jellyfish", it looks nothing like a jellyfish even slightly, far more resembling some sort of insectoid.
* PlotIrrelevantVillain: It has no real purpose in the story. At the beginning of the third act, Godzilla swiftly kills it very quickly while H.E.A.T went to find Jonathan Insley to destroy his D.R.A.G.M.A project.
* WarmUpBoss: It only shows up in the prologue of the episode, then immediately dies once H.E.A.T return to the past.
[[/folder]]

[[folder:D.R.A.G.M.A.]]
!!!'''Debut:''' "Future Shock"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/dragma.png]]

D.R.A.G.M.A. are a species of man made monsters created by Dr. Jonathon Insley to take mankind back to simpler times and avoiding civilization's increasing reliance on technology. When H.E.A.T. gets drawn into an alternate future, the D.R.A.G.M.A. have overrun the planet, wiping out all of the mutations on Earth, including Godzilla, and reducing the human race to a few isolated pockets of survivors. H.E.A.T returns to the present and locates Insley and destroys his work, killing the juvenile D.R.A.G.M.A.s before they can mature and threaten the world.
----
* AlienBlood: According to Mendel, they have sulfuric acid as blood.
* DragonsAreDemonic: They resemble dragons mixed with a ''Triceratops'', and are quite possibly the deadliest adversary Godzilla faces (if only because they actually succeeded in killing him).
* ExplosiveBreeder: One on one, the D.R.A.G.M.A. aren't the toughest monsters around, considering ordinary humans with advanced weaponry can take them out. However, they breed like rabbits, rapidly overrunning the planet through sheer weight in numbers.
* {{Expy}}: Of Destroyah.
* FunWithAcronyms: Their name actually stands for Democratic Resurgence Against Global Mechanized Armageddon (D.R.A.G.M.A), although the characters don't discover this until the end of the episode.
* GoneHorriblyRight: Dr. Jonathon Insley created them to replace humans as the planet's dominant species. He succeeded, with his creations wiping out most of the human population and all of the other mutations.
* HeroKiller: In a BadFuture, they killed Godzilla, though not until he took a lot of them with him.
* ImmuneToBullets: Zigzagged. The adults are immune to most forms of conventional weaponry (though given Godzilla was supposedly able to kill at least some of them, they aren't completely invincible). As infants, however, their hides are much thinner and more susceptible. Alternatively, they are mentioned to adapt quickly, and the ones from the present-day haven't adapted to modern weapons yet.
* LivingWeapon: They were created to be this.
* NotSoInvincibleAfterAll: Despite being the most destructive creatures in the series (given they wiped out much of humanity and all other monsters), they are still susceptible to the high-powered energy weaponry that Future-Mendel's resistance fighters wield.
* PrehistoricAnimalAnalogue: They seem to resemble a cross between a Triceratops and a dragon.
* StrongerWithAge: As newly hatched infants, the D.R.A.G.M.A. are easily taken out by H.E.A.T. using future energy weapons. Once they mature, however, they are capable of causing global Armageddon.
* TurnedAgainstTheirMasters: The D.R.A.G.M.A.s show absolutely no loyalty to their master, Dr. Insley. In the future, Hicks relates to the H.E.A.T. team that by the time the military learned Insley was responsible for the outbreak, he was already long dead at the hands of his creations. In the present, when Insley orders the D.R.A.G.M.A.s to kill the team, he only succeeds in drawing their attention on to him.
* UtopiaJustifiesTheMeans: They were created by [[TheManBehindTheMonsters Dr. Jonathan Insley]], head of the Democratic Resurgence Against Global Mechanized Armageddon project ''(D.R.A.G.M.A)'', [[EvilLuddite who believed mankind's overreliance on technology would bring about its extinction]], and wanted to use his creations to force mankind to embrace a more simpler time. Unfortunately, Insley ''[[DidntThinkThisThrough didn't]]'' consider a way to call his creations off once they'd completed their task, an oversight that resulted in his own death, countless others and the near extermination of mankind.
* ZergRush: Alone they don't appear much stronger than any of the other kaiju shown in the series, but the issue is that even at the beginning there are dozens of them.
[[/folder]]

[[folder:Giant Water Beetle]]
!!!'''Debut:''' "Cash of the Titans"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/giant_water_beetle.png]]

The Giant Water Beetle is a mutation that serves as a pawn of millionaire promoter Maximilian Spiel. He first appears attacking H.E.A.T. headquarters to keep the team distracted while Spiel's mercenaries abducted Godzilla. Later, it is encountered by Monique and Randy on Spiel's island and pursues them while Godzilla battles Rhinosaurus. After Rhinosaurus is defeated, Godzilla turns its attention on the beetle, throwing it into the arena's control tower, pinning Spiel under its body weight.
----
* AttackAnimal: Maximilian Spiel sent the Giant Water Beetle to attack H.E.A.T. headquarters as a diversion. After Godzilla is successfully captured, the Beetle is called off by the sound of a foghorn. Later, it is deliberately released into the arena to kill the members of H.E.A.T. trying to free Godzilla.
* BigCreepyCrawlies: A water beetle the size of a large vehicle.
* BigGuyLittleGuy: The Little Guy to Rhinosaurus' Big Guy, as while it's not large enough to take on other mutations, it is still large enough to be a threat to human adversaries. It is also smart enough to respond to a signal by its human masters, while Rhinosaurus never has any opportunity to show any kind of intelligence.
* PoisonousPerson: It releases clouds of ammonium nitrate gas from the pores on its head.
[[/folder]]

[[folder:Rhinosaurus]]
!!!'''Debut:''' "Cash of the Titans"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/rhinosaurus.png]]

Rhinosaurus is one of several mutations held captive by wealthy promoter Maximilian Spiel to participate in monster fights. It serves as Godzilla's opponent in the arena, though Godzilla is able to defeat it in a single blow after Craven disables the spotlights blinding Godzilla.
----
* BadassNormal: It lacks any special abilities, but is a formidable mutation with a massive horn and thick, durable hide that allow him to go toe-to-toe with Godzilla for a time.
* BigGuyLittleGuy: The Big Guy to the Giant Water Beetle's Little Guy, being large enough to go one-on-one with Godzilla while the Beetle chases H.E.A.T. around the arena.
* CurbStompBattle: It has Godzilla on the ropes for most of the fight only because Godzilla is being blinded by Maximilian Spiel's spotlights. Once Craven destroys the spotlights, Godzilla knocks Rhinosaurus out in a single TailSlap.
* ExactlyWhatItSaysOnTheTin: It resembles a cross between a rhinoceros and a dinosaur.
* HornAttack: As a mutated rhino with no special abilities, its primary means of attack is to gore its opponent with its horn. It is shown to be tough enough to drive his horn through several meters of concrete with little effort (though this broke off several meter-long splinters of horn).
* RhinoRampage: It's a giant mutated rhinoceros forced to do combat against other mutations.
* SpikesOfVillainy: Rhinosaurus has a series of bony spikes running down its spine.
[[/folder]]

[[folder:Shrewster]]
!!!'''Debut:''' "The Twister"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/shrewster_2.png]]

The Shrewster is a mutated shrew encased in a tornado created at an accident at a power plant. It eventually made its way to New York, where it attracted the attention of H.E.A.T., who eventually developed a device to depressurize the Shrewster's tornado. After being defeated by Godzilla, the Shrewster was slated to be taken to Monster Island.
----
* ArtisticLicenseBiology: A particularly egregious example in a series that already plays extremely loose with science. It's a shrew that somehow had its DNA combined ''with a tornado''. You know, the weather phenomenon. The inanimate mass of rapidly moving and inert mass of air, water vapour, and dust particles. It somehow had genetic material that could spontaneously fuse with an animal, giving it the inexplicable ability to continuously generate a tornado around itself.
* BigEater: Elsie points out that shrews eat three times their own body weight every day to keep up with their high metabolism. The Shrewster uses its tornado as a means of drawing food to it.
* BlowYouAway: Shrewster is able to surround itself in a tornado as its primary means of attack, defense, and locomotion.
* TheCameo: Appeared in another episode; apparently he never got to Monster Island and was actually captured to take part in mutant fights.
* ExtremeOmnivore: It will gladly eat anything that its tornado draws inward: trees, vehicles, [[ToServeMan Nick Tatopolous]], etc.
* ShoutOut: Its ability to conceal itself in a tornado, coupled with its BigEater tendencies, is likely a reference to the Tasmanian Devil from ''WesternAnimation/LooneyTunes''.
* TornadoMove: It creates a giant tornado around itself.
[[/folder]]

[[folder:Skeetera]]
!!!'''Debut:''' "S.C.A.L.E."
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/skeetera.png]]

Skeetera is a mutated mosquito that attacked Miami, where she was attacked by Godzilla. Despite intervention from the eco-terrorist group S.C.A.L.E., Skeetera was eventually subdued by Godzilla and transported to Monster Island. Not long after it arrived, S.C.A.L.E. arrived to free the monsters contained on the island. Skeetera began attacking the other mutations, drinking their blood and copying their abilities. Godzilla finally managed to defeat her by knocking her into a nearby power plant.
----
* BigCreepyCrawlies: A giant, energy-sucking mosquito.
* CurbStompBattle: A four-way battle between Skeetera, C-Rex, King Cobra, and the Giant Bat ends up with Skeetera pretty much kicking everyone's backside.
* GiantFlyer: She's big to begin with, and she keeps getting larger whenever she feeds on the blood of other mutations.
* HighVoltageDeath: Godzilla defeats Skeetera by smacking her with his tail directly into the power plant on Monster Island. While it's never outright stated that she was killed by it, we don't see her up and about with the other mutations at the end of the episode.
* MiracleGroMonster: Whenever she drinks a fellow mutation's blood, Skeetera increases in size.
* MosquitoMiscreants: She's a giant mosquito that feeds on other mutations, absorbing their powers. This requires Godzilla and H.E.A.T. to put her down.
* PowerParasite: In addition to getting bigger, drinking a mutation's blood also grants Skeetera any special powers her victim may have, from Godzilla's atomic ray to King Cobra's adhesive spit.
[[/folder]]

[[folder:Norzzug]]
!!!'''Debut:''' "Protector"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/norrzug.png]]

The ancient guardian of the city of Amon-Ra, Norzzug eventually became too dangerous and was forced into a river, rusting him solid for centuries. After being unintentionally revived by archaeologists, the giant winged-lion statue began attacking nearby oil refineries to absorb the fuel housed with them. H.E.A.T. and Godzilla confronted Norzzug, though he was able to escape by creating a sandstorm to disable Godzilla. After consulting the archaeologists that revived him, H.E.A.T. learned of its vulnerability to surface oxidizing. They lured Norzzug to a salt mine with oil and sprayed him with a special chemical that would rapidly rust him when exposed to seawater. Godzilla returned and fought Norzzug, forcing him into the sea and rusting him solid again.
----
* BlowYouAway: Norzzug can create hurricane-force winds just by flapping his wings.
* ElementalBaggage: Subverted, as Norzzug can only breathe fire for so long before it has to replenish its oil reserves. It's dependency on fuel sources allows H.E.A.T. to lure it into a trap.
* FieryLion: It's a fire-breathing lion statue.
* KillItWithWater: After being sprayed with a special chemical, Norzzug is forced into the sea where the chemical reacts with the salt water to rust him solid.
* LivingStatue: Of a giant winged lion.
* OutsideContextProblem: Whereas most of the other adversaries that Godzilla and H.E.A.T. come into conflict with are mutated animals or man made weapons (both organic and mechanical), Norrzug is a LivingStatue that can fly and breathe fire. Where it came from, how it is alive, and how an ancient civilization was able to stop its rampage are never explained beyond what is necessary for the plot.
* OutsideGenreFoe: It was all but stated to be magic in a show where all of the other monsters were either mutants, ancient fauna, man made, or extraterrestrial.
* PantheraAwesome: Norzzug has the appearance of a giant winged lion.
* PlayingWithFire: So long as it's absorbed enough oil, Norzzug can breathe a constant stream of fire from its mouth.
* ShoutOut: Norzzug bears a strong resemblance to the Griffon from the 1969 Toho ''Film Film/LatitudeZero''. Possibly also to King Caesar: both are [[LivingStatue living statues]] based on mythical lion-like creatures that served as protectors.
[[/folder]]

[[folder:Medusa]]
!!!'''Debut:''' "Freak Show"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/medusa_48.png]]

Medusa is a mutated sea anemone found on a Pacific atoll by mutant circus owner Tobias Wilson, who intended to put it on display at one of his shows. During a show in New York, Medusa escaped confinement by turning into a liquid form, going on a rampage and draining bystanders of water. It eventually reached New York's water reservoir, where Godzilla confronted it. After nearly killing Godzilla, Medusa made her way to the sea, but Godzilla was quickly revived by the military and repeatedly blasted it with atomic breath, melting Medusa and preventing it from reforming. H.E.A.T. sucked up the liquidated mutation with a huge vacuum meant to clean up oil spills.
----
* BodyHorror: After being drained by Medusa, its victims are left barely alive as shriveled-up husks.
* CombatTentacles: Medusa uses its tentacles to grab victims and absorb the water from their bodies.
* {{Cyclops}}: It only has one eye.
* ImMelting: Medusa is able to turn to liquid and reform at will. It also melts when exposed to high temperatures, such as Godzilla's atomic breath.
* LifeDrinker: Uses its tentacles and body to absorb water to sustain itself and grow, primarily leeching it from living beings.
* MiracleGroMonster: It grows larger the more water its body absorbs.
* TentacledTerror: A mutated sea anemone that uses its tentacles to drain living things of their water.
[[/folder]]

[[folder:Ts-eh-Go]]
!!!'''Debut:''' "Where is Thy Sting?"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/ts_eh_go.png]]

Ts-eh-Go is a prototype, genetically engineered scorpion bio-weapon created by the US military in the deserts of New Mexico. After Godzilla begins making a beeline for the arachnid's location, H.E.A.T. arrive in New Mexico and are confronted by the giant scorpion, though Godzilla forces it to retreat. Colonel Charles Tarrington, the man in charge of the project that created Ts-eh-Go, reveals that the mutation is too uncontrollable and shows H.E.A.T. a batch of smaller scorpions, dubbed "Second Wave". With Ts-eh-Go no longer necessary, the military turns on the scorpion. In the ensuing chaos, Godzilla is incapacitated by the scorpion's sting, while a downed helicopter accidentally frees Second Wave. H.E.A.T. manages to revive Godzilla and uses a pheromone sample to lure the smaller scorpions to attack their giant predecessor. Now overwhelmed, Ts-eh-Go was powerless to defend itself as Godzilla returned and wiped out all of the scorpions with his atomic breath.
----
* AcidAttack: Able to shoot acid from its stinger as a ranged attack. It uses it to weaken Godzilla's skin enough to sting him after it fails to penetrate Godzilla's hide the first time.
* BewareMyStingerTail: It’s a Scorpion so this is a given.
* EarlyBirdCameo: A smaller but otherwise identical mutant scorpion named Scorpio briefly appears in the earlier episode "Freak Show".
* {{Expy}}: Of the Giant Scorpions from ''Film/TheBlackScorpion''.
* FlawedPrototype: Ts-eh-Go is created by the US military as a living weapon, but proved too hard to control. The "Second Wave" scorpions are meant to replace it, as their smaller size makes it easier to control, house, transport, and feed them than their giant predecessor.
* KillItWithFire: Both Ts-eh-Go and Second Wave are completely roasted by Godzilla's atomic breath.
* MiniMook: After Ts-eh-Go proves to be too uncontrollable, the army develops "Second Wave", an army of scorpions each about the size of a cat or small dog. Sure, they're still large enough to qualify as BigCreepyCrawlies, but they're positively tiny compared to the building-sized mutations usually encountered by HEAT.
* ProjectileWebbing: The Second Wave scorpions are able to shoot streams of green silk from their mouths, which they use to bind Ts-eh-go.
* ScaryScorpions: Again, it's a giant scorpion.
* TunnelKing: It's able to burrow underground as a secondary means of locomotion.
* WhatHappenedToTheMouse: After the scorpions are destroyed and H.E.A.T. leaves, Colonel Tarrington authorizes the development of "Third Wave", though nothing ever comes of this.
* YouHaveOutlivedYourUsefulness: Colonel Tarrington declares it obsolete as it's too difficult to control, leading to the creation of "Second Wave" and Tarrington's men attempting to destroy it shortly after H.E.A.T. discover it.
* ZergRush: The smaller "Second Wave" scorpions tend to swarm their prey, though this could be attributed to them all reacting to pheromone markers on the target rather than an intentional strategy.
[[/folder]]

[[folder:Giant Turtle]]
!!!'''Debut:''' "End of the Line"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/giant_turtle_2.png]]

The Giant Turtle made its first appearance off the coast of Alaska, attacking the cruise ship ''Borealis'', where Nick and Audrey were having a romantic cruise on. When the two become stranded on a nearby deserted island, the Turtle attacks them again, but is driven off by Komodithrax when it draws too close to her nest. Later, the Turtle returns and is able to steal Komodithrax's egg while she is distracted by the military. Godzilla intervenes, but is defeated by the Giant Turtle. Komodithrax returns and pushes the Turtle into a fissure in the ice, but the turtle pulls her and her egg into the fissure with it.
----
* DisneyVillainDeath: After being flipped onto its back, the Giant Turtle can only flail its legs helplessly as Komodithrax pushes it into a massive fissure in the Arctic ice.
* MutualKill: Gets pushed into a fissure in the ice by Komodithrax, but manages to pulls her down with it.
* PrehistoricAnimalAnalogue: Partially resembles an ankylosaurus, with his spiky carapace and clubbed tail.
* ShoutOut: It bears some similarities to Kamoebas, namely its spiky carapace and extendable neck. He even dies dragging his opponent down with him, just like Kamoebas did to Ganimes in ''Film/SpaceAmoeba''.
** A giant turtle with prominent tusks in its lower jaws? Sounds a lot like [[Film/{{Gamera}} another iconic kaiju]].
* SpikesOfVillainy: It's shell is covered in spikes, fitting for the monster responsible for the death of Godzilla's mate.
* SuperPersistentPredator: He is relentless in getting Komodithrax's egg, even fighting off both her and her mate.
* TailSlap: Its primary attack, due to the large clubbed end. Just one swing is enough to leave Godzilla stunned for a brief time.
* TakingYouWithMe: The Giant Turtle grabs onto Komodithrax leg as it falls, pulling her and her egg into the crevice with him.
[[/folder]]

[[folder:Komodithrax]]
!!!'''Debut:''' "End of the Line"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/komodithrax.png]]

Komodithrax is a mutated Komodo dragon that H.E.A.T. encountered in a deserted island off the coast of Alaska after it defeated the Giant Turtle that menaced Nick and Audrey. Shortly afterwards, Nick discovered that Godzilla and Komodithrax were mates and Godzilla was acting as a surrogate father to her unhatched egg. The US Military attacked the nest to destroy all the monsters present, and the Giant Turtle took advantage of the chaos to steal Komodithrax's egg. After Godzilla was knocked unconcious, Komodithrax arrived, flipping the turtle onto its back and pushing it into a fissure in the ice. However, the Giant Turtle clutched onto the edge of the crevice, causing it to collapse and send Komodithrax and her egg falling into the fissure after it.
----
* BreathWeapon: She can fire a blue Atomic Breath from her mouth.
* DireBeast: She is a kaiju-sized komodo dragon, but aside from her size looks the same as a normal komodo dragon.
* GentleGiant: After Komodithrax drives off the Giant Turtle she corners Nick & Audrey, but spares them because she can smell Godzilla on the former, leaving the couple be while she retreats into her hot springs heated forested valley home, paying them no mind as they help themselves to some fruit after following her in.
* InformedSpecies: Nick states that Komodithrax is a member of the same species as Godzilla despite him being a mutant iguana and her a mutant komodo dragon--likely a relic for when she ''was'' a member of Godzilla's species early in development.
* MonsterIsAMommy: She reproduced via parthenogenesis and laid an egg. Unfortunately, both she and the egg perish falling into a crevice.
* MutualKill: She pushes the Giant Turtle into a fissure in the ice, who in turn pulls her down with it.
* TemporaryLoveInterest: For Godzilla, who becomes her mate in the episode until she's killed by falling into a crevice.
[[/folder]]

[[folder:Bacillus]]
!!!'''Debut:''' "What a Long, Strange Trip It's Been"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/bacillus.png]]

Bacillus is a mutated bacterium that appeared on the outskirts of New York City, where it was confronted by H.E.A.T. and Godzilla. During the battle, it infects both Godzilla and Craven, but is seemingly killed by Godzilla's atomic breath. Later, while Godzilla is too sick to fight, Bacillus reappears, having formed an endospore barrier around itself to survive. It began heading straight for New York City's water supply, with Randy using the Heat-Seeker to keep it away long enough for Godzilla to revive. Even before Godzilla can resume the fight, the now-cured Craven drives a speed boat containing a barrel of the antidote directly towards the germ's gaping max, causing Bacillus to dissolve.
----
* CombatTentacles: Bacillus has several tentacles surrounding its mouth that it uses to bind opponents. It also has a bladed tentacle-like appendage it can extend from its mouth to directly infect other kaiju.
* InstantIllness: Both Godzilla and Craven get sick within a matter of minutes of being exposed to Bacillus. After being treated, both recover just as quickly.
* LuckilyMyShieldWillProtectMe: Bacillus is able to form an endospore around its body as a shield to protect itself from extreme conditions. It's even strong enough to survive Godzilla's atomic breath.
* MegaMicrobes: A bacterium big enough to fight Godzilla. Even its tiny spawn are still big enough to hunt down humans.
* MiniMook: After Bacillus infects Godzilla, Nick and Monique discover dozens of beachball-sized bacilli in Godzilla's bloodstream and around his brain stem.
* NonIndicativeName: Real-world bacilli are rod-shaped bacteria ("Bacillus" being the Latin word for "stick"). By contrast, Bacillus is spherical, looking more like a generic germ than anything else.
* NotQuiteDead: It's seemingly killed by Godzilla during their first encounter, only to return while Godzilla is out of commission.
* {{Plaguemaster}}: It's a mutant bacteria capable of infecting both man and mutation. While Godzilla is out of action, it attempts to infect New York's water supply.
* ShoutOut: The way Bacillus infects Godzilla with tiny versions of itself, putting him in a comatose state, is similar to how [[Film/GameraVsJiger Jiger disabled Gamera by implanting her offspring into his body]] . In both cases, scientists pilot a mini sub into the infected kaiju's body to kill the parasite from within.
** An early draft of Film/GodzillaVsMechagodzillaII had a team of scientists being injected into Godzilla's body to battle him from within, making this an inverse Shout-Out by instead having the scientists trying to save Godzilla instead.
[[/folder]]

[[folder:Sub-Zero Manta]]
!!!'''Debut:''' "Wedding Bells Blew"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/sub_zero_manta_3.png]]

A mutated manta ray that could fly and shoot ice beams from its mouth, the Sub-Zero Manta appeared in an aquarium in New Jersey, taking up residence in the penguin exhibit. It later moves on to a nearby frozen food packaging plant where H.E.A.T. found it. Nick eventually realizes that the Sub-Zero Manta is looking for some place cold and lure it to a nearby ice rink, where it begins hibernating. While waiting for the military to come transport the monster away, the arena's generator dies and the temperature rises, awakening the Sub-Zero Manta. Godzilla again confronts the Manta, with their fire and ice attacks creating a massive thunderstorm. The two combatants head out to sea, with Godzilla pulling the manta underwater. Godzilla begins swimming in circles, creating a powerful whirlpool that drags the Sub-Zero Manta down, never to be seen again.
----
* FlyingSeafoodSpecial: A mutated manta ray capable of flight.
* GiantFlyer: Big enough to cover most of an ice hockey rink.
* AnIcePerson: Fires a highly concentrated freezing attack.
* NonIndicativeName: It's Japanese name translates to "Bird of Prey", likely due to the creature originally being a bird mutation until it was changed to a manta ray
* ShoutOut: Possibly a reference to a giant flying manta ray from WesternAnimation/TheGodzillaPowerHour episode "The Macro-Beasts".
* TragicIceCharacter: To an extent, the Manta can be seen as this: it originated in the Arctic and somehow lost its course, ending up in the New York area and began searching for a suitable habitat, only to be confronted by Godzilla and presumably killed for its troubles.
[[/folder]]

[[folder:Megapede/Cicada]]
!!!'''Debut:''' "Metamorphosis"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/megapede_form_1.png]]
[[caption-width-right:300:In its Megapede juvenile form]]
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/megapede_form_2.png]]
[[caption-width-right:300:In its adult Cicada form]]

Megapede first appeared in the American Midwest, ravaging nearby farms. H.E.A.T. arrived to investigate and ran into the creature as it attacked the Indiana State Fair. Godzilla gains the upper hand, but the Megapede [[EyeScream spits poison in Godzilla's eyes]], forcing him to retreat to wash his eyes out. Without Godzilla, H.E.A.T. is helpless to stop Megapede from disappearing into the ground. After building an electrical net to trap the Megapede, they follow it down its hole, only to find an empty caccoon. The now-metamorphosed Cicada heads towards Chicago and begins producing a mating call, which disables electronic signals across the city. H.E.A.T. coats the creature's wings with insulating foam, stopping its call, and Godzilla arrives, chasing the giant insect into Lake Michigan and drowning it.
----
* BigCreepyCrawlies: A kaiju-sized centipede that metamorphoses into a kaiju-sized cicada.
* CreepyCentipedes: Naturally.
* {{Expy}}: Of Battra, with Megapede as the larval form and Cicada as its adult form. Its two fights with Godzilla take place at a carnival and underwater, very similar to Battra's two brawls with Godzilla.
* KillItWithWater: Godzilla drowns the Cicada in Lake Michigan.
* KryptoniteFactor: Megapede has a vulnerability to electricity. H.E.A.T. builds an electrical net to trap it, only to learn that it had lost its weakness after metamorphosing into Cicada.
* MetamorphosisMonster: It changes from a giant mutant centipede into a giant mutant cicada.
* SomewhereAnEntomologistIsCrying: Nick states that it is a hybrid of a centipede (a ''Myriapod'') and a cicada (an insect), two species separated by hundreds of millions of years of evolution.
* SpikeShooter: The Megapede is able to shoot poisonous barbs at his enemies.
* SuperSpit: In both of its forms, it has a poisonous spit attack that can blind its enemies.
* TunnelKing: In its first form, it is able to burrow through the ground with ease.
[[/folder]]

[[folder:Giant Armadillo]]
!!!'''Debut:''' "Area 51"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/giant_armadillo.png]]

The Giant Armadillo was one of many mutations caused by nuclear testing at Areat 51 in the 1950's. It burrowed out of its enclosure and began running amok inside the walls of Area 51, encountering a pair of trespassers searching for signs of alien life. A photo the two men take appears on the news, attracting the attention of H.E.A.T., who offered their assistance in recapturing the mutation. Randy comes up with a plan to entangle the Armadillo in the root system of a giant Mesquite plant, which is successful. The Giant Armadillo was then transported back into its enclosure.
----
* DiscOneFinalBoss: The Giant Armadillo is quickly captured by H.E.A.T. with no assistance from Godzilla whatsoever. The Thorny Devil is then revealed to be the episode's real antagonist.
* TunnelKing: A skilled burrower, which allowed it to escape its enclosure.
* UnwittingInstigatorOfDoom: The Giant Armadillo's escape also allows the Thorny Devil to break out of its own enclosure and nearly escape Area 51 altogether.
[[/folder]]

[[folder:Thorny Devil]]
!!!'''Debut:''' "Area 51"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/thorny_devil.png]]

The Thorny Devil was one of many mutations caused by nuclear testing at Area 51 in the 1950's. After H.E.A.T. had helped the military recapture the Giant Armadillo, the base's overseer Dr. Candace Kirk revealed that the Thorny Devil had also escaped when the Giant Armadillo had gotten out of its enclosure. H.E.A.T. located the giant lizard, which proved too much for them, but Godzilla arrived to protect his friends. The Thorny Devil was able to overwhelm Godzilla with a barrage of venomous spikes and tried to break down the gates of Area 51. Godzilla recovered enough strength to resume the battle, flipping the Thorny Devil onto its back and slaying it with his atomic breath.
----
* AchillesHeel: While most of his body tough enough to tank Godzilla's Atomic Breath, his underbelly is much more vulnerable.
* BottomlessMagazines: The spikes it shoots from the back of its neck are constantly regenerating, giving it a limitless supply of poisonous ammunition.
* FamilyUnfriendlyDeath: After being flipped on his back, the Thorny Devil is roasted alive by Godzilla's Atomic Breath, screaming in pain all the while.
* KillItWithFire: How it meets its demise.
* MisplacedWildlife: The thorny devil is a real species of lizard, yet they are native only to Australia, not Nevada.
* OverlyLongTongue: It has a long spiked tongue that it can use to skewer prey with.
* PoisonousPerson: Each of the projectiles it shoots from its back are said to contain the toxic equivalent of 20 scorpion stings.
* ReptilesAreAbhorrent: A giant mutated lizard and antagonist to Godzilla.
* SpikeShooter: It can launch dozens of venomous spikes from the back of its neck.
* SpikesOfVillainy: As its name suggests, the Thorny Devil's head and back are covered in bony spikes.
* TunnelKing: Not quite on par with Godzilla himself, but an exceptional burrower nonetheless.
[[/folder]]

[[folder:Silver Hydra]]
!!!'''Debut:''' "Shafted"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/silver_hydra_2.png]]

The Silver Hydra is a mineral-based kaiju of unknown origin that lived in a mine in Blind Rock, Wyoming. It first emerged in the 1940's, encasing a group of miners in silver, eventually leading to the mine being shut down and the town abandoned. In a nearby town in the modern day, H.E.A.T. hears the legend of the mine and decides to investigate and encounters one of the Hydra's, which sprays liquid silver on Elsie's leg, quickly encasing it as the silver spreads. Craven was able to slice up the hydra with a hand-held laser, though the individual pieces reform into smaller hydras. Godzilla arrives and melts the hydras with his atomic breath, but they regenerate into a single, two-headed Silver Hydra, which entraps Godzilla in liquid silver. H.E.A.T. decides to flood the mine with cold water from a nearby spring, reasoning heat from nearby Yellowstone Park's geysers had awoken it from hibernation. The cold water causes the Silver Hydra's body to solidify and shatter.
----
* AsteroidsMonster: The Hydra is able to split into smaller individuals, which can later remerge into a massive two-headed version.
* BlobMonster: Though it has a distinctive head and limbs, most of its body is a shapeless mass of liquid silver.
* DiabolusExMachina: It does not get an origin or an explanation for how it came to be, which makes its strange powers and the fact that it bears no resemblance at all to any known animal all the more jarring.
* DugTooDeep: The Silver Hydra first appears in a silver mine in the late 1940's, resulting in the deaths of a number of miners. However, it's never made clear whether it was the miners who woke up the beast or if it was already awake when they stumbled across its path.
* EyesDoNotBelongThere: The Silver Hydra has multiple eyes on both sides of each of its antenna.
* KnightOfCerebus: It and the D.R.A.G.M.A.s are the only mutations to have confirmed human body counts, but unlike the D.R.A.G.M.A.s we actually get to see the Silver Hydra's handiwork in the form of the petrified remains of the miners that it killed back in the 1940s.
* KryptoniteFactor: Cold temperatures cause the Silver Hydra's body to solidify and shatter.
* LiterallyShatteredLives: After cold water solidifies its body, the Silver Hydra shatters like glass.
* MadeOfBologna: When Craven slices it apart with his laser, the Silver Hydra collapses into completely solid chunks with absolutely no interior anatomy visible at all before going all AsteroidsMonster.
* MultipleHeadCase: When the smaller hydras merge together, the Godzilla-sized Silver Hydra has two heads.
* ShoutOut: Possibly to Destroyah; its ability to split into numerous smaller hydras and merge into a larger two-headed form is similar to Destroyah shifting between its Juvenile and Aggregate forms. Also, it ends up shattering after its body is subjected to cold temperatures.
* SiliconBasedLife: As its name implies, the Silver Hydra's body is comprised of silver.
* TrapMaster: It shoots out liquid silver that spreads to cover a larger area than what was originally hit. This allows it to quickly immobilize its victims and eventually smother them as their bodies become entirely encased in silver.
[[/folder]]

[[folder:Lizard Slayers]]
!!!'''Debut:''' "Lizard Season"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/lizard_slayers.png]]

The Lizard Slayers are a trio of mechas built by Cameron Winter to kill Godzilla, with Winter breaking amateur monster hunters Dale, Hank, and Bill from prison to pilot them. The three mechas engaged Godzilla, quickly overwhelming him. H.E.A.T. calls in the military to assist Godzilla, though the Lizard Slayers are able to fight off the Army while Godzilla makes his escape. The members of H.E.A.T. are able to bring down Lizard Slayer 2 and Lizard Slayer 3, while Nick and Major Hicks infiltrate Lizard Slayer 1. After a brief fistfight, Godzilla bites through Lizard Slayer 1's armor, forcing its pilot to surrender. The pilots are placed under arrest, and Cameron Winter denies having any connection with them, claiming his mechs were stolen, allowing him to escape justice once again. Winter later calls Nick to gloat that the military was impressed with the machines and placed a large order for Lizard Slayers of their own.
----
* {{BFG}}: Lizard Slayer 1 has a large cannon in each arm, and Lizard Slayer 3 has a single cannon above the cockpit.
* TheBusCameBack: The three pilots had previously appeared in "Cat and Mouse", where they attempted to kill Godzilla and were arrested for the destruction they caused in the process.
* ChestBlaster: Lizard Slayer I has a minigun and tasers built directly into its chest.
* ColorCodedForYourConvenience: The three Lizard Slayers are red, green, and blue.
* EveryoneHasStandards: While perfectly content to hunt down Godzilla, both Hank and Bill are apprehensive about going against the US military, and Bill outright refuses to attack the HEAT Seeker with people onboard.
* GatlingGood: Lizard Slayer 1 has a mini gun mounted on the front of the torso.
* HumongousMecha: Designed by Cameron Winter specifically to hunt down Godzilla and other mutations.
* ImperialStormtrooperMarksmanshipAcademy: The Lizard Slayers accidentally hit one another just as much as (if not more so than) Godzilla. They're so bad that they even shoot one another during target practice.
* InformedAbility: Cameron Winter mentions that Lizard Slayer III has laser weaponry, though these are never seen in use.
* LandSeaSky: The three mechs are each designed for different purposes: Lizard Slayer I is a terrestrial-based exosuit, LSII is an amphibious attack vessel, and LSIII is aerial assault vehicle.
* MacrossMissileMassacre: Each of the Lizard Slayers is loaded out with tons of missiles (Lizard Slayer II is explicitly stated to have enough firepower to take out the US Seventh Fleet).
* RealRobot: The Lizard Slayers were designed to be mass-produced anti-mutation weapons.
* ShockAndAwe: Lizards Slayer I has short-range tasers built into its chest.
* ShoulderCannon: Lizard Slayer I has shoulder-mounted missile launchers.
* ShoutOut: The Lizard Slayers are possibly a reference to the Spider Slayers, a series of [[PoweredArmor armored suits]] built to defeat ComicBook/SpiderMan.
* ShoutOutThemeNaming: The three pilots are named [[WesternAnimation/KingOfTheHill Hank, Dale, and Bill]].
* UnskilledYetStrong: The Lizard Slayers are indeed up to the task of taking on Godzilla. The pilots? Not so much.
* WalkingArmoury: Each Lizard Slayer has a wide assortment of missiles and guns, Lizard Slayer 1 has tasers for short-range combat, Lizard Slayer 2 packs torpedoes for underwater use, and Lizard Slayer 3's got laser weaponry.
* WhatHappenedToTheMouse: Despite Winter claiming that the military has contracted with him to manufacture more Lizard Slayers for their uses, the mechs are never seen or mentioned again in the series.
[[/folder]]

[[folder:Giant Mutant Hummingbird]]
!!!'''Debut:''' "Vision"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/giant_mutant_hummingbird.png]]

The Giant Mutant Hummingbirds were mutated by flowers contaminated with chlorofluorocarbons (CFC) in California's redwood forests. These monsters made their way to San Francisco in search of new sources of CFC's, attacking a military jet. Because of their reflective feathers and high speed, the hummingbirds were impossible to see under normal circumstances, making it impossible for Godzilla to properly fight them. Craven and Randy created a pair of goggles that allowed Godzilla to see the Mutant Hummingbirds, who were then quickly defeated. The Pentagon then decided to study their stealth capabilities to create new stealth jets.
----
* AcidAttack: The hummingbirds have an acidic spit that can quickly eat through the windshields of military aircraft.
* BizarreTasteInFood: The Hummingbirds are addicted to chlorofluorocarbons, attacking planes that use CFC's as fuel.
* CurbStompBattle: Once they lose the advantage of stealth, the Mutant Hummingbirds are easily defeated by Godzilla without offering up the slightest bit of resistance.
* FragileSpeedster: They can keep pace with jet airliners, but they can't take a hit to save their lives.
* MadeOfIron: Zig-zagged. The hummingbirds are some of the weakest mutations in the series, easily being [[CurbStompBattle curb-stomped]] by Godzilla, yet all of them manage to survive attacks that killed supposedly tougher mutations in other episodes.
* OneHitPointWonder: Every last one of them gets one-shotted by Godzilla.
* SuperSpeed: So fast that they're impossible to see with the naked eye, requiring H.E.A.T. to construct special goggles to allow Godzilla to see them.
[[/folder]]

[[folder:Armillaria]]
!!!'''Debut:''' "Underground Movement"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/armillaria.png]]

Armillaria is a giant, mutant fungus that attacked and destroyed farmland in Michigan. With its food supplies running low, it began attacking people, getting the attention of H.E.A.T. The fungus fended off Godzilla and nearly killed Monique, though H.E.A.T. eventually managed to locate its body. After the military dug up Armallaria, Godzilla threw it onto a nearby beach, cutting it off from any sources of food, and then incinerated it with his atomic breath.
----
* AliensInCardiff: Rural Michigan is not the first place you would expect a giant mutated mushroom to start wreaking havoc.
* CombatTentacles: The Armillaria has dozens (if not hundreds) of tentacles that it uses to siphon off amino acids from its victims. The tentacles can extend for miles from the Armillaria's body and are strong enough to bind Godzilla.
* EvilIsBigger: While its main body is hardly bigger than Godzilla's head, its tentacles eventually extend across an area of more than 1,500 acres (2.34 square miles or 6 square kilometers), surpassing every other mutation in sheer size.
* FungusHumongous: A mushroom mutated to kaiju-sized proportions by pesticides.
* ParasitesAreEvil: Played with, since it's a mutated fungus. Real life ''[[https://en.wikipedia.org/wiki/Armillaria Armillaria]]'' aren't parasites and eat [[https://en.wikipedia.org/wiki/Saprotrophic_nutrition decayed organic material]], but they do cause [[https://en.wikipedia.org/wiki/Armillaria_root_rot root rot]] that causes some species of trees to die. This one is so large that not only has it reduced miles of farmland into a wasteland, it's also started going after people to drain their amino acids.
* ShoutOut:
** It could be a nod to Biollante, as it is based on a life form other than an animal (in this case, a fungus) and attacks Godzilla with tentacles.
** The Armillaria's tentacles bursting from the ground and grabbing the nearest object is possibly a reference to the Graboids from the ''{{Film/Tremors}}'' series.
** It is also possibly a reference to the mutated fungus from the Toho film ''{{Film/Matango}}''. The Armillaria's ability to siphon nutrients from its victims is similar to how Matango drains energy from its victims in its appearance on ''Series/GodzillaIsland''.
[[/folder]]

[[folder:Fire Monster]]
!!!'''Debut:''' "Ring of Fire"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/fire_monster.png]]

The Fire Monser first appeared on an oil rig in the Gulf of Mexico, feeding off the oil as a fuel source. H.E.A.T. investigates the damaged rig and tries unsuccessfully to combat the Fire Monster. Godzilla arrives to fight it, but Godzilla's atomic breath only strengthens the Fire Monster. After discovering the Fire Monster is feeding off the oil to fuel its fire, H.E.A.T. leads it out into open ocean, where its fuel eventually runs out. Craven wanted to study the creature and, against Nick's wishes, secretly transports the Fire Monster back to H.E.A.T. headquarters. However, the Fire Monster revives when the creature's methane blood causes an explosion after contacting a furnace's pilot light. Craven and Randy then rig N.I.G.E.L. with nitroglycerin and send him at the creature, with the explosion displacing the oxygen and defeating the Fire Monster. H.E.A.T. then seals it in a capsule and drops it into the sea.
----
* AlienBlood: It bleeds methane.
* BigCreepyCrawlies: It’s an earwig the size of a horse.
* TheEndOrIsIt: as soon as the capsule hits the ocean floor it’s smashed open by a wayward shark.
* FeedItWithFire: Godzilla's atomic breath just makes the Fire Monster's flames more powerful.
* NotQuiteDead: After defeating it the first time, Craven sneaks it back to Staten Island so that he can study it, but as soon as it gets a spark it springs back to life. They don’t take any chances the second time, placing it in an air-tight capsule and dropping it in the ocean.
* PlayingWithFire: What else would you expect from a creature called the [[ExactlyWhatItSaysOnTheTin Fire Monster]]?
* WreathedInFlames: The Fire Monster is able to surround itself with a fiery aura several times its own size.
[[/folder]]

[[folder:Swamp Beast]]
!!!'''Debut:''' "The Ballad of Gens du Marais"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/swamp_beast.png]]

A creature of possible supernatural origin, the Swamp Beast appeared to attack a pair of oil hunters who entered its swamp. Later, while H.E.A.T. is investigating, the Swamp Beast attacks a catfish plantation owned by a local businessman named Dimanche. A local fisherman named George tells Nick that the Swamp Beast is the Spirit of the Swamp and that he can influence its actions, but not control it completely, and that Dimanche is trying to take the swamp away from the Gens du Marais (People of the Swamp). Later, the Swamp Beast attacks Dimanche's riverboat, but H.E.A.T. calls in Godzilla to hold it off while Nick points out to George that the Swamp Beast is endangering innocent bystanders. The Swamp Beast follows Dimanche back to his mansion, but George is finally able to call it off when Dimanche is arrested for his corrupt business practices.
----
* AlwaysABiggerFish: It makes its first appearance by dragging an alligator underwater after it had attacked two men in their boat.
* AmphibianAssault: While not explicitly stated to be an amphibian (or an animal at all), it has the crouched posture of a toad. George uses it to attack businesses that are harming the swamp.
* DishingOutDirt: The Swamp Beast is able to shoot out streams of mud from pores on its back.
* MaybeMagicMaybeMundane: Is the Swamp Beast the swamp's guardian spirit as George and the other Gens du Marais believe, or is it a mutation caused by polluted groundwater as Nick maintains?
* MysteriousMist: The Swamp Beast's sudden appearances and disappearances are accompanied by thick fog that appears out of nowhere and fades just as quickly.
* PetTheDog: After George calls off the Swamp Beast, Nick stops Godzilla from pursuing it as it peacefully returns to its swamp.
* {{Planimal}}: Its body is composed of both plant and animal matter.
* ThePowerOfHate: George summons the Swamp Beast as a means of revenge when a [[CorruptCorporateExecutive local businessman]] continuously threatens the swamp and its inhabitants with careless pollution and overfishing. George eventually lets go of his anger and calls off the Swamp Beast when Nick [[WhatTheHellHero points out that his revenge is endangering the lives of innocent bystanders]].
[[/folder]]

[[folder:Deep Dweller]]
!!!'''Debut:''' "Tourist Trap"
[[quoteright:300:https://static.tvtropes.org/pmwiki/pub/images/deep_dweller.png]]

A giant deep-sea-dwelling fish, the Deep Dweller was forced to the surface, where it became disoriented by the light and began attacking passing ships. It soon attacks the attention of H.E.A.T., who eventually try to lure it out of the Hudson Canyon and off the continental shelf.
----
* BerserkButton: Due to it being accustomed to the depths of the ocean, bright lights cause the Deep Dweller to behave erratically and lash out at any light source that gets too close.
* FiendishFish: A giant anglerfish with a mouth 40 feet across, capable of biting through the hulls of smaller ships.
* HellishPupils: Its eyes have rectangular pupils like a goat.
* NonMaliciousMonster: The Deep Dweller is just an extraordinarily large sea creature that ended up becoming removed from its native habitat and began lashing out in its confusion. Rather than destroy it, H.E.A.T. spends most of the episode trying to guide the creature back to deeper waters.
* SeaMonster: It greatly resembles an anglerfish that is large enough to take bites out of small ships.
* VertebrateWithExtraLimbs: In addition to a normal set of fins, it has a pair of three-toed forelimbs.
[[/folder]]

!!Allies

[[folder:Major Anthony Hicks]]
[[quoteright:325:https://static.tvtropes.org/pmwiki/pub/images/gts_major_anthony_hicks.png]]

--> '''Voiced By:''' Creator/KevinDunn

* AnArmAndALeg: In the BadFuture, he has a cyborg arm.
* GodzillaThreshold: In ''[[BadFuture Future Shock]]'', Hicks reveals he freed every one of the mutations on Monster Island [[BehemothBattle to try and fight the Dragmas]]. [[NoSell It didn't even slow them down]].
* HeroAntagonist: As a soldier, his job is to protect the American people from all threats, up to and including giant mutations. This puts him at odds with H.E.A.T. until Godzilla proves he is not a threat.
* MajorlyAwesome: To an extent. While he usually plays second fiddle to H.E.A.T. and Junior, Hicks does have his own moments of Awesome, is usually out on the field getting dirty, and does note that he sometimes have to follow orders despite the team's advice.
* OldSoldier: In "Future Shock", he's still an integral part of the human resistance, despite being at least in his sixties and missing an arm. Of course, given humanity is on the brink of extinction, he doesn't exactly have much of a choice in the matter.
* ReasonableAuthorityFigure:
** While he has voiced that he would prefer to nuke every mutation out there, he understands the necessity of keeping Junior around and has many times let HEAT do things their way to save the day.
** At the same time, even when he goes against the team it's for reasonable reasons, often citing the chain of command or the threats to loss of life that could ensue.
[[/folder]]

[[folder:Audrey Timmonds]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2022_11_17_225700.png]]

--> '''Voiced By:''' Creator/PagetBrewster

* AdaptationPersonalityChange: In the movie, Audrey was fairly timid, as opposed to her brash and assertive personality in the show. This could be explained due to her having gotten out from her former employer's thumb at the end of the film.
* AesopAmnesia: In the movie, she (should have) learned it wasn't a good idea to use information from Nick without his permission which costs him his job, but eventually reconcile with him when he was proven correct when the first Godzilla laid eggs and patched things up with him but not before quitting her job. In this series, she tries to further her career when she suspects Nick is up to something or when Nick tries to contain information involving Godzilla when the big guy is off on his own devices or fighting the MonsterOfTheWeek. However, she accidentally let it slip that Godzilla was having a tantrum which caused property damage instead of him hunting down a monster in the area (Nick's suggested story) which causes a riff between them. They reconcile but she learns not to involve Godzilla, [[HeroWithBadPublicity who already has a bad reputation in his hands]].
* BadFuture: According to Mendel, in the Dragma-overrun future, Audrey and her husband (presumably some man she married after Nick disappeared) were last seen planning to travel to New Zealand (apparently there are fewer Dragmas in the southern hemisphere...assuming you survive the ocean crossing).
* ClingyJealousGirl: She expresses jealousy towards Nick's relationship with Elsie.
* TheDeterminator: She'll go through great lengths to get what she wants. This gets [[{{Deconstruction}} Deconstructed]] when her determination nearly caused S.C.A.L.E. to break free all the mutations on Monster Island. Thankfully, Audrey learns from this and promises to not let her goals blind her to the potential consequences.
--> '''Audrey:''' "Blind determination can lead to dire consequences." ''(throws the tape's final cut into her burning fireplace)''
* GoingForTheBigScoop: This actually jeopardizes her relationship with Nick in one episode when Junior was going through his version of growing pains.
* IntrepidReporter: While she does cover normal stuff, she does like a [[GoingForTheBigScoop bigger story]]. This gets [[{{Deconstruction}} Deconstructed]] as her desire to get the scoop has left negative impacts towards her life once or twice, especially with her relationship with Nick.
** She lies in the news about Godzilla's threat level, even though her boyfriend tells her not to do it. This severely strains their relationship and while they do make amends, Nick isn't ready to forgive Audrey yet.
** Her obsession to see Monster Island makes her the perfect UnwittingPawn to an EcoTerrorist and nearly brought about the end of the world.
* ItsAllAboutMe: She's willing to spy on Nick, due to his work with Godzilla and the other mutations, and at one point, even risks Godzilla's life by claiming he's become as dangerous as his predecessor, all just to get a scoop big enough to propel her career. Not surprisingly, this severely strains her and Nick's relationship.
* ItsAllMyFault: She says this to Nick while being held hostage by Springer admitting that she unwittingly lead S.C.A.L.E. to Monster Island.
* OffTheRecord: During the episode where it was done documentary-style and dealing with "eco-friendly terrorists," Audrey destroyed the final tape, citing that some secrets are best kept hidden.
* SuspiciouslySpecificDenial: In the first episode, she rightfully believes Nick was hiding something from her, but denies that what she is doing has nothing to do with their relationship... only to throw her jealousy towards Elsie out in the open, and waking Godzilla up on accident.
* UnwittingPawn: She was this when she unwillingly led S.C.A.L.E. to Monster Island when it turn out the pin Springer gave her was actually a tracking device.
[[/folder]]

[[folder:Victor "Animal" Palotti]]
--> '''Voiced By:''' Creator/JoePantoliano

* DeadpanSnarker: Much like in the movie, Animal frequently snarks at events.
* DisappearedDad: He went missing some time in the BadFuture, leaving behind his young son.
* NervesOfSteel: While most other people are either ducking or scrambling for cover during the latest "Godzilla vs MonsterOfTheWeek" throw down, he ''still'' keeps on taping in the middle of the action and doesn't let go of his camera, come hell or high water.
[[/folder]]

[[folder:Phillipe Rouche]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2022_11_17_225256.png]]
[[caption-width-right:350:]]
--> '''Voiced By:''' Creator/KeithSzarabajka

* {{BFG}}: Carries a missile launcher with a special weapon that causes even a giant monster to [[TakenForGranite be turned to stone-like substance]] before [[LiterallyShatteredLives crumbling to dust]].
* DemotedToExtra: Despite his prominent role in the film, Phillipe's role is greatly reduced in the series, with only three total appearances (one being a voiceless cameo in the opening scene of the first episode and another being to tip off Monique to the DNA Mimic's existence).
* HeroAntagonist: He spends an entire episode trying to kill Godzilla Jr., despite Randy and Monique's protests. At the last moment, he changes his mind and kills the Chameleon.
[[/folder]]

[[folder:Dr. Yukiko Ifukube]]
!!!'''Debut:''' "Competition"
->Voiced By: Page Leong

Scientist for the J.S.D.F. and creator of the Robo-Yeti.
----
* JurisdictionFriction: She is revealed to be the one who tried to prevent H.E.A.T. from entering Japan and later has them arrested by the J.S.D.F. while Robo-Yeti is battling Godzilla, whom she mistakenly believes is behind the disappearance of several Japanese hikers. Only when the King Cobra is revealed to be the real culprit and Robo-Yeti badly damaged in the encounter does she relent to working with H.E.A.T.
* LabcoatOfScienceAndMedicine: She wears a white lab coat over her J.S.D.F. uniform.
* LoopholeAbuse: When Monique protests that Japan's constitution prohibits the J.S.D.F. from possessing offensive weapons, Dr. Ifukube responds that her robot is purely defensive in nature.
* RobotMaster: According to Mendel, Dr. Ifukube is one of the world's leading theorists in robotics. Given she was able to design a voice-operated mechanical ape capable of going toe-to-toe with Godzilla, she certainly lives up to that claim.
* ShoutOut: Her name is almost certainly a reference to Akira Ifukube, the composer for numerous Showa and Heisei-era Godzilla films.
[[/folder]]

!!Other Enemies

[[folder:Cameron Winter]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/screenshot_2022_11_17_225525.png]]
[[caption-width-right:350:]]
!!!'''Debut:''' "The Winter of Our Discontent"
--> '''Voiced By:''' Creator/DavidNewsom

A former college classmate of Nick's turned billionaire CEO, Cameron Winter is responsible for a number of plots to kill Godzilla for profit, and is notably one of the series' few recurring antagonists.
----
* ArchEnemy: To Nick.
* TheBadGuyWins: He got away with giving HumongousMecha to three villains by claiming they stole the mecha from him and even [[spoiler:convinced the government to buy mecha from him]], which was [[CutLexLuthorACheck his goal]] all the time.
* BeardOfEvil: Has a short little beard on his chin.
* BigBad: The closest one in the series.
* CorruptCorporateExecutive: Uses his business in less-than-legal ways.
* CutLexLuthorACheck: Like [[ComicBook/LexLuthor the villain after whom the trope is named]], he isn't above causing major disasters to be able to sell a way to solve it.
* DeadpanSnarker: He's a jerk out to make money, but he's got quite the sense of humor.
--> '''Winter''': (''Watching his Lizard Slayers doing more damage to one another than to Godzilla'') It's official: I've hired Film/TheThreeStooges.
* {{Expy}}:
** Of ComicBook/LexLuthor. CorruptCorporateExecutive with a genius intellect? Check. Attempts to control and/or kill the most powerful creature on the planet? Check. Seemingly limitless resources? Check. [[CardboardPrison Comically short prison sentences]] when he doesn't [[KarmaHoudini avoid prison altogether]]? Check.
** To a lesser extent, of a pre-CharacterDevelopment [[ComicBook/IronMan Tony Stark]]. He even goes on to create mech-suits designed to take out a rampaging [[ComicBook/TheIncredibleHulk menace]]-turned-HeroWithBadPublicity that the military invests in wholesale.
* FauxAffablyEvil: Puts on a facade of manners, but underneath is a greedy man who is only out for money.
* Fiction500: Downplayed. Cameron Winter is the wealthiest man in the world and can afford to create his own anti-Godzilla weaponry, but it's all done fairly realistically.
* FourEyesZeroSoul: He wears glasses and is one of the more sinister antagonists in the series.
* {{Greed}}: He's already stated to be the richest CEO in the world, but that isn't enough for him. He will enact more evil schemes to make more money, with no regard for who gets hurt.
* KarmaHoudini: Despite mind controlling Godzilla into attacking any army base, he got out of prison after a short sentence and his subsequent appearances he gets away with everything he does.
* KarmaHoudiniWarranty: While not in the series itself, in the Fox Magazine web comic, "[[https://wikizilla.org/wiki/FOX_Kids_Magazine_issue_37 Ice Cold Winter]]", he is presumably killed when Godzilla blasts away the ship Winter and his men were on at the end of the comic.
* KnightOfCerebus: Has nothing much funny about him even in spite of his facade and tendency for making witty quips, doesn’t have any redeeming qualities to name, all his crimes are somewhat personal and destructive, and he is repeatedly shown to stand out as one of the most malicious humans to appear in the show, even among a show filled with giant mutated monsters.
* TheNicknamer: Constantly refers to Nick as "Nickels", an insult at Nick's financial prospects from their time in college.
* OmnidisciplinaryScientist: Much like the heroes, it is never specified what Cameron's doctorate is in. His specialties appear to be robotics (hence his creation of the Cyber Flies and Lizard Slayers) and genetics (as he created the Chameleon, a partial clone of Godzilla). The alternative explanation could be that he had subordinates do the work for him after he brainstormed up the ideas.
* {{Sadist}}: He tried to be subtle about it, but it is clear that he is absolutely proud and unapologetic about using Godzilla as a weapon against his will and he deliberately had him and later the three mercenaries he had broken out attack innocents and the military just for his amusement. He even cheerfully explains how much he looks forward to seeing the Chameleon ruin Godzilla’s reputation just to spite Nick.
* TheSociopath: Has no problems with killing anybody or anything that gets in his way. His first appearance had him mind control Godzilla into attacking a military base so he could get a contract for the destroyed weaponry, showing no regard the number of people killed, and in "An Early Frost", he created the Chameleon and had it attack New York City while disguised as Godzilla just to make himself look like a hero when the Chameleon kills the real Godzilla.
* SmugSnake: Very, ''very'' much so.
* VillainWithGoodPublicity: While the heroes know better, to the rest of the world, Winter is just a successful businessman, allowing him to repeatedly avoid jail and profit off his criminal activities.
[[/folder]]

[[folder:Dale, Bill, and Hank]]
!!!'''Debut''': "Cat and Mouse"
->'''Voiced by''': Dale (Creator/RonnyCox), Bill (Creator/TomKenny), and Hank (Creator/BobJoles)

Three redneck hunters who arrive to New York to hunt the giant rats in New York, but Dale aims to hunt down the biggest predator of them all: Godzilla
----
* BullyingADragon: These three Stooges came to New York just to take a shot at Godzilla. Their first attempt was hilariously disastrous when Godzilla doesn't bat an eye at a rocket aiming towards him, and it hits a reconstructed top of the Chrysler Building.
* EvenEvilHasStandards: Hank doesn't like the idea to shoot at the military. Cameron then decides to override his Lizard Slayer to shoot at them instead.
* NotSoHarmlessVillain: Dale, Bill, and Hank in "Cat and Mouse" were incompetent in their debut episode for hunting down Godzilla with just rocket launchers, and didn't even hit him. In "Lizard Season", they managed to give the Big G a few hits until H.E.A.T decides to take each of the Lizard Slayer mechs individually.
* ShoutOut: To ''WesternAnimation/KingOfTheHill'' in which came out one year before this series. They even used the three names, although Dale is the smart one, Bill is the in-between, and Hank is the dumb one.

[[/folder]]

[[folder:Dr. Alexander Preloran]]
!!!'''Debut:''' "Leviathan"
->'''Voiced By:''' Creator/KennethMars

A xenobiologist that leads an expedition to investigate the sunken remains of an alien ship.
----
* AmbiguousSituation: Much of Dr. Preloran's character is left up to speculation. Did he agree with the aliens or were they controlling him psychically? Was he really trying to save everyone by sending them up in the escape pod or was he ensuring that Soppler and Hoffman reached the surface in order to carry out the next stage in the aliens' plans? Was he really willing to sacrifice his life to save the others or was he trying to fake his death, knowing he had a means of escape? Where did the portal he open take him and what ultimately happened to him?
* HeroicSacrifice: Dr. Preloran stays aboard the flooding Leviathan in order to launch the escape pod containing H.E.A.T. and Drs. Soppler and Hoffman.
* UncertainDoom: He is last seen opening a portal aboard the Leviathan and stepping through it, seemingly escaping the flooding ship. His ultimate fate is unknown and he is never mentioned again.
[[/folder]]

[[folder:Leviathan Aliens]]
[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/leviathan_alien.png]]
--> '''Voiced By:''' Creator/RonPerlman

The Leviathan Aliens first appeared in a spaceship stuck at the bottom of the ocean. Later, they take control of two of the scientists who explored their ship, using their telepathy to turn the members of H.E.A.T. against one another. They then took control of most of Earth's known mutations, sending them to attack major cities across the planet to soften them up for their invasion.
----
* AlienInvasion: They orchestrate one during the "Monster Wars" story line.
* AliensAreBastards: They are aliens who want to invade Earth and subjugate humanity.
* ArcVillain: They were the main threat in "Monster Wars" trilogy.
* TheAssimilator: After downloading information about Earth from Soppler and Hoffman, the Leviathan's plan to colonize Earth. During "Monster Wars", Soppler and Hoffman begin mutating into Leviathans as the trilogy progresses, only partially regressing back to human after the invasion is foiled.
* BigBad: Of the "Monster Wars" arc.
* BigNo: Hoffman and Soppler give one when the Leviathan fleet is ordered to retreat.
* BizarreAlienBiology: They have four legs, two forearms extending from each elbow, [[LongNeck a neck able to extend to almost as long as the rest of their body]], and massively bulbuous heads with [[GlowingEyesOfDoom glowing green eyes]] ([[RedEyesTakeWarning red if angered]] or alarmed), downward pointing tusks and perpetually open mouths. They also [[TelepathicSpacemen communicate entirely telepathically]], and they can upload their consciousness into humans, which will then gradually morph into one of them.
* BodyHorror: The two main Aliens were once scientists. Over the course of "Monster Wars", they slowly lose much of their humanity till they look like their alien masters. Only after the invasion fleet was defeated that the two reverted, albeit partially, back.
* CompositeCharacter: They combine elements of the Kilaaks from ''Film/DestroyAllMonsters'' (taking control of the Earth's monsters and sending them to attack major cities) and the Simeons from ''Film/GodzillaVsMechagodzilla''.
* DidntThinkThisThrough: Using the remains of the first Godzilla by reanimating and making him more powerful by installing weapons and his own atomic breath means that he's stronger than he was in life. Unfortunately for them, they used a corpse to fight his much younger and stronger son who manages to defeat him with relative ease.
* EasilyThwartedAlienInvasion: Apparently, all it took was freeing the Earth monsters from their control and destroying a few of their ships to send the entire Leviathan fleet packing.
* TheEndOrIsIt: Even though the invasion was stopped, Nick believed that they'll be back.
* GrandTheftMe: The Leviathan Aliens implanted their minds onto two of their captives before they were destroyed. These two would drive the plot of "Monster Wars" until their defeat.
* HiveMind: Due to sharing a mind link.
* KlingonsLoveShakespeare: They admit to finding human architecture aesthetically pleasing and planned to rebuild as much as they could after the invasion.
* LongNeck: Their necks are able to extend almost as long as their body.
* MedievalStasis: The ones on Earth were stuck there for millions of years, yet when the rest of the species showed up in the "Monster Wars" three-parter, they were shown using the exact same technology as their stranded brethren; the race's society also had apparently not changed at all in all that time, as it immediately heeded the castaways' signal to lay violent siege to the Earth.
* MindManipulation: They uses this in full effect; driving the H.E.A.T. apart, taking control of one of them, the entire US military and all the Earths monsters.
* NoBiochemicalBarriers: Averted; one of the Leviathan aliens ''melts'' when exposed to Earth's atmosphere, which is why they need to upload their consciousness into human bodies in the first place.
* SmugSnake: They clearly think they'll win regardless what their lesser minded opponents would do. Their arrogance costs them dearly.
* SoreLoser: After the invasion fails, Hoffman and Soppler try to kill H.E.A.T. as a means of avenging their defeat, although Major Hicks is able to stop them.
* TelepathicSpacemen: They communicate entirely through telepathy.
* ThisCannotBe: They can only stare in disbelief after Godzilla trashes Cyber-Godzilla.
* TransformationOfThePossessed: Humans who have been mentally assimilated will gradually have their bodies mutate to completely match their alien minds.
* TranshumanAliens: Soppler and Hoffman gradually mutate into Leviathan aliens over the course of "Monster Wars".
* VillainousBreakdown: The two main Aliens scream in horror after H.E.A.T. completely ruins their plans. They even try to kill them in a last attempt at retribution.
[[/folder]]

[[folder:Dr. Jonathon Insley]]
!!!'''Debut:''' "Future Shock"
-> '''Voiced By:''' Creator/NickJameson

Creator of the D.R.A.G.M.A.
----
* DidntThinkThisThrough: He creates an army of virtually unstoppable monsters specifically replace humanity as Earth's dominant species, yet never develops a means of controlling his creation, leading to his death in the BadFuture. This is best exemplified when H.E.A.T. shows up to destroy his work and he releases the D.R.A.G.M.A. and tries to sic them on H.E.A.T., which only draws their attention to him.
* EvilLuddite: Insley believes that mankind's reliance on machinery and technology will be its undoing, and sets out to find a way to bring humanity back to simpler times. The end result is the near extinction of the human race.
* {{Irony}}: He is a scientist whose experiments nearly wipe out the human race. Those very experiments were intended to ''prevent'' humanity from being wiped out by science and technology advancing too far.
* MadScientist: He certainly qualifies, considering he thought creating the D.R.A.G.M.A. was a sensible solution to society's problems.
* TheManBehindTheMonsters: He tries to be this, only to have his creations immediately turn on him.
* NiceJobBreakingItHero: Though calling him a hero is a bit of a stretch, Dr. Insley did have good (if horribly misguided) intentions for creating the D.R.A.G.M.A. His methods nearly result in the global armageddon he was trying to stop.
* WellIntentionedExtremist: In his own mind at least, Dr. Insley is trying to stop humanity from destroying itself through over reliance on technology.
[[/folder]]

[[folder:Maximilian Spiel]]
!!!'''Debut:''' "Cash of the Titans"
-> '''Voiced By:''' Creator/ClancyBrown

A boxing and wrestling promoter who started hosting mutant fights on his private island.
----
* AllPartOfTheShow: He has Nick and Elsie deposited into the arena where Godzilla and Rhinosaurus are fighting in order to dispose of them, forcing his announcer to play it off as part of the act.
* BadPeopleAbuseAnimals: His villainy starts with capturing mutations and holding them prisoner with electrified cages, and only escalates from there.
* BeastlyBloodsports: Taken to the extreme, since the beasts in question that he makes fight each other are building-sized mutations.
* CorruptCorporateExecutive: Audrey alludes to him engaging in shady business practices.
%%* EvilSoundsDeep: God bless you, Mr. Brown.
* FauxAffablyEvil: Starts off as a reasonable, polite, and professional businessman, up until his true colors are revealed to be that of a sadistic, greedy, and sleazy scumbag who would kill both kaiju and human alike for his own elitist purposes.
* {{Greed}}: Money is the primary purpose for turning the nature reserve into a fighting ring. Just like Cameron Winter, he was already established to have great wealth, but he just wants more and is willing to do whatever it takes to extract money from the fights he stages.
* IslandBase: Spiel owns an entire island that he uses to host giant monster fights. To further highlight how much more awful he is, the island in question ''used'' to be a nature preserve.
* LargeHam: His hamminess is justified due to being a fight club announcer.
* MakeItLookLikeAnAccident: His plan to dispose of H.E.A.T. after his henchmen capture them is to dump them into the arena where Godzilla is fighting Rhinosaurus and the Giant Water Beetle, portraying them as professional animal tamers so that their deaths would look like a stunt gone wrong.
* RiggedSpectacleFight: He uses a high-beam spotlight to blind Godzilla while he is fighting Rhinosaurus, giving the latter an unfair advantage until Mendel is able to disable the spotlight.
* {{Sadist}}: He makes no secret that he thoroughly enjoys televising the brutal fights and resulting deaths, and using the carnage to make a profit.
* TheSociopath: Concerned only about his money and his own life, disregards the lives of humans and mutations, treats everyone (even his own audience and subordinates) like disposable tools to be used and abused, and is a shameless elitist.
[[/folder]]

[[folder:Alexandra Springer]]
!!!'''Debut:''' "S.C.A.L.E."
--> '''Voiced By:''' Creator/LindaBlair

An eco-terrorist and leader of the organization S.C.A.L.E., who seeks to free the mutations imprisoned on Monster Island to allow them to take over the planet.
----
* AnimalWrongsGroup: She turns S.C.A.L.E. from a peaceful group into a terrorist organization.
* TheDeterminator: A darker and destructive example. She's so willing to accomplish her goals that she doesn't care about the consequences (if anything, she embraces them).
* EcoTerrorist: She wants Mutations to be the dominant force on Earth even if it means sacrificing humanity to do it.
* FromNobodyToNightmare: S.C.A.L.E was once a peaceful animal rights group until Springer came along and turns it into a group of terrorists.
* HumansAreTheRealMonsters: She is most certainly of this mindset, believing that the new mutations should be the rightful rulers of the planet. Considering the mutations are the direct result of humanity's mistakes, [[JerkassHasAPoint she does have a point]], though her methods are far too extreme.
* LargeHam: Her ferocity is matched by her long-winded rants.
* ManipulativeBitch: Springer spends much of her runtime playing Audrey like a fool, much to the latter's dismay.
* ShadowArchetype: To Audrey, if her obsession for success goes out of control, which Audrey herself lampshades at the end of the episode.
* TakingYouWithMe: After her plan fails, she tries to activate Monster Island's self-destruct mechanism, though a soldier is able to stop her before she reaches the switch.
[[/folder]]

[[folder:Colonel Charles Tarrington]]
!!!'''Debut:''' "Where is Thy Sting?"
->'''Voiced By:''' Creator/MichaelChiklis

The military commander in charge of the project that created the giant scorpion Ts-eh-go.
----
* FriendlyAddressPrivileges: Despite their differences in rank (a colonel being two ranks ahead of a major), he and Major Hicks casually refer to one another as "Chuck" and "Tony", respectively.
* TheManBehindTheMonsters: Colonel Tarrington is behind the creation of Ts-eh-go (or "First Wave" as it's officially known) and its smaller successors, "Second Wave". After both are destroyed by Godzilla, he quickly asks his R&D department how quickly they can get "Third Wave" operational.
* NoPokerFace: When Randy confronts him about the missing smugglers with no evidence, he quickly asks who told him about that and then quickly dismisses H.E.A.T. when Randy continues to pry.
* OldFriend: Major Hicks refers to him as such, and Col. Tarrington does trust him enough to explain his plans for weaponized mutations to him.
* UngratefulBastard: He orders his men to fire on Godzilla immediately after the giant lizard shielded him from Ts-eh-go's acid attack, something Major Hicks is quick to call him out on.
[[/folder]]
----