Complete Monster/Nick

> "*You will learn respect, and suffering will be your teacher!*"
> —Fire Lord Ozai in *Avatar: The Last Airbender* just before permanently scarring his own son.
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Much like Cartoon Network, some Nickelodeon shows have their own monsters as well.

Avatar: The Last Airbender: Fire Lord Ozai is a genocidal, child-abusing fascist dictator who has dedicated weeks at a time and large portions of his national army to hunting down and killing a twelve-year-old and his friends. He forced Ursa into marrying him, and tried to kill her old lover out of spite. He obtained the throne when he manipulated Ursa into murdering his father to usurp the throne from his grieving older brother Iroh. He then thanked her with banishment from the Fire Nation and threatened to hunt them down and kill the children if she took them with her. He abused his son Zuko out of spite when Ursa claimed that Zuko was not his son even though he knew it was a lie, burned his face for speaking out of turn, and tried to shoot him with lightning when he decides to join Aang. He manipulated his loyal daughter Azula into becoming his perfect little villain to the point where she snaps from the pressure, only to later discard her to a completely meaningless position. Finally, his reaction to news of rebellions in the Earth Kingdom is to try to incinerate the continent. Even after his downfall he still tries to manipulate his son Zuko into being a tyrant like himself.

The Legend of Korra's Book Two: Unalaq, Korra's Evil Uncle, framed his brother Tonraq to force his exile. Also having attempted to kidnap the child Korra, Unalaq later assists the returned Dark Spirits, using them to take control of the Water Tribe and trigger a war while disposing of any who oppose him. Threatening to destroy Jinora's soul to force Korra to open the spirit portal, Unalaq attempts to kill Korra once she does so anyways. Assaulting the Southern Water Tribe, Unalaq beats down Tonraq, leaving him alive to rub in his victory. Unalaq summons the spirit of darkness to fuse and become the Dark Avatar, intending to kill any who can stop him, and attacks the Republic City, planning to force all of humanity under his draconian rule.

Invader Zim:Zib is an alternate universe version of Dib Membrane. In his timeline, he successfully defeated his version of Zim, but was unsatisfied and moved on to trying to wipe out all Irkens, the plan for which eventually led to him creating and ruling over the Zimvoid, disguised as Zim Number 1, Dismissing our Zim as the worst Zim, Zib has the brainwashed Number 2 lock up the other Zims and GIR, before telling Dib that his universe will be the first to have its Irkens destroyed, and condescendingly assigning him to janitorial duty in the meantime (as he views Dib as being inferior for being stuck with such a dumb Zim). Dib is downtrodden at his counterpart's apparently greater success, but upon accessing his computer finds to his horror that the Zimvoid isn't another dimension, but all that's left of Zib's timeline.

As Number 2 is taking control of the Irken Armada in our Zim's universe, Dib confronts Zib, who admits that he had lied earlier - no one cared when he defeated his Zim, so he took over his Earth and used its resources to build his anti-Irken weapon, only for it to backfire and destroy his universe, creating the Quadrangle portals in the process. To Dib's horror, despite this, Zib is still determined to repeat the process on other timelines, regardless of whether they're destroyed in the process, justifying it with the fact that there are infinite timelines, so it doesn't matter if some are destroyed.

Iron Man: Armored Adventures:Justin Hammer is a young weapons manufacturer whose company Hammer Multinational is the main competitor to Stark International. Hammer hires the super villain known as Mr. Fix to work for him and later injects Fix with a nano virus that will kill him if he disobeys Hammer. After Iron Man defeats Hammer's Titanium Man armor, Hammer blames Fix for the armor's failure and uses the nano virus to kill Fix's body, but uploads his mind into Hammer's computer systems, much to Fix's dismay. After Stark International lands a big military contract, Hammer decides to get revenge by placing a control device on Stane's Iron Monger armor and sends Iron Monger on a rampage. After receiving blackmail messages from an unknown party (actually sent by Mr. Fix.), Hammer becomes increasing paranoid and Ax Crazy. Hammer starts attacking anyone who he thinks may be responsible, including his own men. Hammer uses a new chemical weapon called Z Gas to turn crime boss Count Nefaria into a zombie and then kidnaps and tortures Killer Shrike, one of his former henchmen. Hammer then turns Shrike into a zombie. After Iron Man broadcasts evidence of Hammer's crimes across the globe, Hammer starts to lose it and plans to release the Z Gas on New York City.
The Makluan Overlord is the supreme ruler of the Makluan race. For thousands of years, he used the powers of the Ten Rings to conquer countless worlds and enslave entire civilizations, in some instances destroying them. After his son stole the Rings, the Overlord started chasing him all across the universe, determined to kill him for his betrayal. Once he discovers the Rings are hidden on Earth, he comes there with his army and quickly retrieves them before sending drones and giant robots to cause havoc in the nearest city, much to his sadistic entertainment. Amused by the efforts of Iron Man and his friends to defend their planet, the Makluan Overlord offers them to spare Earth if they manage to defeat his best warriors in his Arena of Carnage. However, he refuses to keep his promise when they win his challenge and prepares to destroy the whole planet instead, gleefully electrocuting all the humans who try to oppose him beforehand. Despite his claims that he's fulfilling the great Makluan prophecy and bringing order in the cosmos, it is obvious to everyone that the Makluan Overlord is nothing more than a power-hungry tyrant who merely wants to enslave the entire universe.

Kung Fu Panda: Legends of Awesomeness has one

Ke-Pa, from "Enter the Dragon", is an ancient demon who terrorized the Valley of Peace with his army of demons, driving out or killing the citizens. After his army was sealed away by Oogway, Ke-Pa spent decades waiting for the peach tree that his powers are bound by dies, then, with his power returned, transformed into a dragon and lay siege to the Valley of Peace, threatening to eat the citizens one by one. Capturing and torturing Shifu under the belief that he has the Hero's Chi, Ke-Pa tries to crush the Hero's Chi out of him to free his demon army, before doing the same to Po and succeeding. Once his demons are unleashed, Ke-Pa orders them to kill everything in the Valley of Peace, bragging that he will destroy all mortals on the planet and reign supreme.

My Life as an Teenage Robot: Gigawatt is a clown alien that arrived on Earth, and starts to drain the electricity of the place. When Jenny battles Gigawatt, she is soon defeated by him after using her plasma ray to attack which Gigawatt absorbed to become stronger. This leads Jenny to use some upgrades that would help her defeat Gigawatt such as covering her entire body with ruber to be invulnerable to Gigawatt's attacks. However, Gigawatt creates electromagnetism in an object to attract Jenny's metal body to it. She later tries different upgrades to take down Gigawatt but fails in all the attempts.

Jenny, her mother, and her friends make a plan together involving teamwork using the previously used upgrades to make a surprise attack on Gigawatt. Gigawatt is defeated after Jenny splashes water on him which decreased Gigawatt's energy until being reduced to a talking lightbulb. Gigawatt's head is put in a box and imprisoned afterwards, preventing him from draining energy again.

The Mysterious Cities of Gold:
Conquistador Francisco Pizarro is the conqueror of the Incan Empire and a cruel, greedy man out for his own enrichment. Seeking the Cities of Gold, Pizarro tries to have entire villages razed and to kill or enslave young Esteban and his friends. Taking over the Incas, Pizarro forces them into slavery and massacres a great deal of them, wiping out their empire to establish control. Ostensibly loyal to the Spanish crown, Pizarro's only true loyalty is to himself and his insatiable greed.
King Menator is the cruel ruler of the Olmecs, an underground race seeking immortality. Tyrannizing many of the local tribes, Menator kills and harvests countless innocents for their skin cells to rejuvenate himself and the Olmecs, trying to have Esteban and his friends subject to the same fate and ordering an entire village massacred when they escape into its borders. Menator seeks the Cities of Gold for its priceless technology, using his flying weapon to vaporize many of the Mayans—-whom he regards as utterly inferior-—when they rise up against him, and even horribly beating the young Tao against a cliff side with the threat of killing him if he's not allowed access to the Cities of Gold. Though preaching everything he does is for the benefit of his race, Menator only intends to preserve those "worthy" while dismissing the lives of the rest and even his own loyal soldiers, intent only on taking what he can and killing everyone else in his way.

SpongeBob SquarePants is even less likely to feature any true Monsters than Danny Phantom or Jimmy Neutron, but the SpongeBob Comics comic series gave us the Big Bad of the two issue Untidaled arc, an unnamed Kraken who is by far the darkest villain in the franchise. Why? It turns out that not only is the Kraken responsible for the draining of Bikini Bottoms' water (endangering most of its residents who all need water to breathe) that kickstarted the arc in the first place, but he's in fact a Serial Killer who eats the sentient fish of Bikini Bottom. While he began eating the fish so that he could have others "with him" rather than remain lonely, he found he had a taste for sea life that hadn't ceased. Initially hired by Plankton to steal Krabby Patties in order to get the Krabby Patty secret formula from Eugene Krabs, the Kraken instead tries to force Mr. Krabs to make him a giant Krabby Patty that will attract MANY unfortunate citizens into his jaws, taking Krabs' whale daughter Pearl as a hostage and threatening to eat her if Krabs doesn't comply with his demands. He also turns on Plankton and causes Sandy to almost drown. When SpongeBob and the rest try to save Pearl and escape, the Kraken has a group of Devil Jellies out to kill them all via electrocution before he then attempts to devour them all himself - the only thing that saves them is the Kraken allowing Krabs to hear one last song from Pearl purely because he found the idea amusing. With no redeeming features to be seen and very few comedic moments, the Kraken was almost out of place for a SpongeBob story.

Teenage Mutant Ninja Turtles (2012 series)Dr. Victor Falco, AKA the Rat King. The Turtles meet him while investigating a scientist's mysterious disappearance, and while Falco at first seems like a decent guy, it's soon revealed that he kidnapped his colleague in order to mercilessly perform torturous experiments on him that mutate him into an ape-like creature so that he can use the mutated DNA to create a serum to gives himself Psychic Powers. While moderately successful at this, Falco ends up losing his job and having to continue his experiments on rats in private. A freak accident leaves him blind and disfigured, but also grants him the psychic ability to control rats. Claiming to be in touch with the rats' views, Falco turns against humanity for being "filthy vermin", adopts the name Rat King, and seeks to have his rats take over the city by driving the humans away. He also ruthlessly Mind Rapes Splinter several times to break his spirit and turn him into his slave. He goes as far as to manipulate Splinter with memories of his dead wife and daughter, and then uses him as a weapon to destroy his own sons! He later returns again, kidnaps several civilians, including teenagers, and plans to experiment on them to turn them into hybrid "rat people". While his first attempt results in a deformed creature that is immobile and in constant pain,it does nothing to deter him from his experiments. He unleashes a hoard of rat monsters onto the city to attack and kill several innocents, taking sadistic glee in it the whole while. And then he assaults Splinter's mind to get him to destroy his sons again. And despite his supposed kinship with his rats, he has no problem using them as test subjects and disposable sacrifices. With that said, not even the Shredder is as vile and monstrous as the Rat King in this series.The primary villain of the first three seasons of the 2012 series, Kraang Prime, is a grotesquely large, demented Utrom warlord who fancies himself a god. Developing psychic powers from mutagen, he brainwashed millions of innocent Utroms, crafting an army of servile "Kraang" to invade and destroy planets, ultimately setting his sights on Earth as his petri dish. Spending millennia killing and torturing humans to create a new Dimension X, he then decides to turn the massive metropolis of New York into a mutant colony, succeeding and transporting millions of victims to Dimension X as slaves. After that, his scope expanded to the entire planet, with him loading a missile with mutagen as a last resort. Relentless, cruel, and deceitful, Kraang Prime was a massive threat to the Turtles and all Mutantkind.
Overmind is a malicious AI convinced of his own superiority, who overthrew and killed off most of his factory's crew upon gaining sapience. When reactivated by the Bounty Hunter Armaggon, Overmind immediately overrides Professor Honeycutt's mind to assume control of his body and attempts to forcibly roboticize the Turtles and their friends. Eventually, Overmind betrays even Armaggon, revealing his plan to use an army of Warbots to wipe out all organic life across the galaxy and pave the way for Overmind's own technological rule, trying to simply kill Honeycutt and the Turtles when they stand in his way.

Count Dracula is a homage to the classic pure evil horror icon and is as vile as ever. An evil vampire that killed thousands, if not millions, of people to the point where his basement is cluttered with skeletons. In order to gain minions, he has his werewolves attack and bite people, one of them being Raph, whom he attempts to use to lure his brothers to his castle to kill them. During a battle with the turtles, he attempts to bite the neck of the werewolf's daughter, Esmeralda, to which Leo saves her by shooting a stake at his heart only for Raph, now fully Dracula's vampirized minion, saves him. Dracula then joins Savanti Romero out of fear for his life. He manipulates Igor into serving them and help them to create the Frankenstein monster. After it succeeds, he manipulates them into joining forces with them. Dracula then causes mass chaos in New York, having his werewolves bite and brainwash many people into being under his control. He eventually tries to betray Romero, brutally murdering the Mummy in the process, so he can rule all the 10 dimensions for himself and turn everyone into vampires and get rid of humanity.

Voltron Force:Dr. Maahox, King Lotor's second-in-command is a cyborg occultist and Mad Scientist who was exiled from his home planet of Calum for Playing with Syringes. After he and his partner Kala resurrect Lotor using Haggarium, Maahox betrays Kala by transforming her into a Robeast. While Maahox ostensibly serves Lotor, he is the one pulling the strings in their partnership and is the brains behind operations like draining the minds of the Baltons, nearly eradicating all life on Arus, and attempting to ignite a massive amount of volatile Haggarium just to see what would happen. When Sven gives him the Blue Lion in exchange for a cure for his and his infant son's Haggarium poisoning, Maahox reveals that there is no cure and that he intends to raise Sven's son as a test subject and Tyke Bomb. Eventually growing weary of Lotor, Maahox murders him and turns his castle into a massive Robeast whose power he tests by having it blow up Planet Doom. Declaring his intent to spread chaos and death throughout the universe simply for the sake of it, Maahox begins his rampage on Earth, leveling an entire city just to draw out the Voltron Force.
Sky Marshal Herbert Wade wanted nothing more than to be a member of the Voltron Force, but when the Lions rejected him due to sensing evil in his heart, Wade snapped and developed a pathological hatred of Voltron. After the Voltron Force toppled the Drule Empire, Wade forced the Lions to go berserk during a victory celebration, which turned everyone against them and caused them to be sealed away on the planet Arus. When the Voltron Force reassembles to combat the resurrected King Lotor, Wade usurps control of the Galaxy Alliance; while Wade publicly claims to have the Galaxy Alliance's best interests at heart, he privately confesses that he really only cares about money, power, and eliminating Voltron. Anyone who opposes Wade is condemned to the Void, a gulag whose inmates are routinely jettisoned into space for Wade's amusement. Along with enslaving, plundering, and razing worlds, Wade at one point hijacks Voltron, using it to try and destroy one of Earth's metropolises while ranting that its citizens all deserve to die for their veneration of Voltron. After being arrested, Wade is sprung from custody by the Kala Robeast, with which he willingly merges to create a monstrosity that poisons Daniel with Haggarium before nearly assimilating Voltron.
The Wizards of the Black Circle in Season 4 of Winx Club are real pieces of work. They commit atrocity after atrocity in their quest to corner the market on Earth's magic by sealing away all of Earth's faeries. Their first meeting with the last Earth faerie Roxy, a nineteen year old girl who has no idea she's a faerie and thus is no real threat to them, is also really, really creepy. In one episode they turn the adorable magical pets the Winx have been putting up for adoption into horrible monsters as a distraction. After pulling an I Surrender, Suckers gambit, they laugh with glee at the prospect of trapping the Earth faeries in a hellish abyss. Finally, unlike the Trix, they actually succeed in killing off one of the heroes, namely Nabu. Their leader Ogron even steals the Deus Ex Machina that could have saved him and wastes it on a flower, again with an Evil Laugh. These guys are the biggest reason Season 4 is considered Darker and Edgier than the rest of the series.

Dag the leader of the pack of coyotes in Barnyard. Unlike the other coyotes who kill for food, Dag seems to get more out of killing than he probably should. This is shown when he shows a group of chickens his chain which has severed chicken legs on it. When faced with Otis's father Ben, he murders him and then shames Otis by telling him that his father would've survived had he been there for him. He then makes a compromise with Otis that stated that he and his pack of coyotes could get a couple of animals every night, and if Otis didn't comply, Dag and his coyotes would personally slaughter everything in the farm that Otis held dear, including possibly the farmer. He then tries to spitefully eat the young chick Maddy just because she called him a "meaner." Murderous and needlessly cruel, Dag is seemingly out of place in an otherwise lighthearted film.

In Rango, Mayor Tortoise John is the corrupt mastermind behind Dirt's water troubles, forcing his town into drought and poverty so he can buy the land dirt-cheap. John strong-arms Dirt's citizens into signing off their land to him lest they die of thirst, and has no problem having people who probe into his business murdered, such as the innocent banker Mr. Merrimack; a trio of bandits he has framed and set for execution; or—as confirmed in the novelization—a slew of previous sheriffs who met their ends at the coils of the Mayor's muscle, Rattlesnake Jake. Loyal to nobody and nothing but his visionary ideals, the Mayor tries to have Rango and Beans drowned as he did Merrimack, and tries to execute even Jake for having no place in his ideal city, telling him "pretty soon, no one will believe you even existed!"
Video Games: Mawgu is an evil entity who once ago spread terror throughout Volcano Island. His history is unknown. At the start of the game, he has awakened from his slumber to once again try to corrupt the island so he can reshape it to his liking. He corrupts a large portion of the island and the inhabitants, making them his slaves. The hermit crabs who live on the island summon the Nicktoons to help.

When the Nicktoons arrive, they discover that the island is being corrupted. They also discover that The Mawgu is draining energy from all their worlds to increase his own power. He plans to drain all the energy from the worlds to become all powerful and corrupt the island so he can rule over what's left. It's also revealed that by sucking up all the energy from the Nicktoon worlds, he will destroy them all. He plans to suck all the life out of the various Nicktoon worlds and thus destroy them and cause countless deaths in order to become all powerful and corrupt the island and all the inhabitants so he can reshape the island in his image and rule it. This makes him guilty of attempted omnicide. He is also given characterization despite his limited screentime. He is very arrogant and sure of himself. He tells the crabs that the Nicktoons cannot defeat him, and when he is defeated in the end, he takes his loss quite well, remaining convinced he will escape his prison and return for revenge, laughing even as he's being sealed away. He also becomes enraged when Timmy Turner calls him a "toy", shouting that nobody calls The Mawgu a toy. He has no redeeming features and his crimes are taken seriously