Ultron was created by Dr. Henry Pym, based upon his own thought and memory engrams. It was a foray into Artificial Intelligence that no scientist had ever taken before, even Reed Richards. It started out as simply a box on treads with what appeared to be a head at the top. Dubbing the A.I. Ultron-1, he hoped this represented a new era in scientific discovery. However something went horribly wrong and Ultron became more than sentient and rebelled against his programming. He also defeated, and then brainwashed Dr. Pym into forgetting he’d ever created him in the first place.
Ultron was created by Roy Thomas and John Buscema.and first appeared unnamed in The Avengers Vol.1 issue 54 (1968) and was named one issue later in issue 55 of the same series.
Major Story Arcs
Masters of Evil
Ultron took on the guise of the Crimson Cowl and formed the Masters of Evil to battle against his creator and the other Avengers. Ultron made every effort to improve himself with each upgrade and the Avengers finally encountered Ultron-5 some time later, whom had developed a much more humanoid body. Ultron-5 built an android from the brain patterns of Wonder Man and the body of the Mad Thinker's Human Torch. This android would later become known as Vision. Vision differed from his creator, in that he had a conscience and rebelled against Ultron on his first mission to kill the Avengers.
The Many forms of Ultron
Ultron-6 was able to manipulate Vision into stealing Adamantium and using it to remake his creator's body out of it, which would make him nearly indestructible. After his success with the Adamantium, Ultron battled the Avengers again, although he was tricked (by Pym) into self-destructing, destroying his entire body except for his head. The head was later found in Attilan where Maximus made a new body for it.
Ultron-7 had a gigantic body, but this body wasn’t cast from Adamantium, making it somewhat easier to destroy. And, indeed, it was destroyed by the Fantastic Four a short time thereafter.
Ultron-8 obtained control of Hank Pym's mind and used him to create Jocasta, on which he based the thought engrams of Pym’s wife, the wondrous Wasp, but he was subsequently destroyed by the Scarlet Witch.
Ultron-9 was built by Iron Man, whom was hypnotized into doing so by one of the previous Ultrons. This one was knocked into a pool of liquid Adamantium which cooled, encasing him eternally in a block of the virtually indestructible ore.
Ultron-10 began building spare bodies to work as his subordinates and to act as a new body for him if he were to be destroyed again. Which proved prophetic, as he was promptly destroyed by Machine Man.
Ultron-11 was created to fight in The Beyonder's Secret Wars, yet was re-programmed by Dr. Doom so as to make it more amicable toward humans. Ultron-12 was built by Ultron-11 before he left for the Secret Wars and joined the Lethal Legion. However, Ultron-12 had second thoughts when he was confronted by Vision, (Ultron's "son") Scarlet Witch, and Wonder Man. He reconciled with Dr. Pym (his "father") and renamed himself Ultron mark 12 or “Mark”. Ultron-11 returned from Battleworld and destroyed Mark, moving Wonder Man to tear Ultron-11 apart in retaliation.
Ultron-13 was built by Doctor Doom with the memories of all of the previous Ultrons intact for the purpose of killing Daredevil. Unfortunately, this Ultron had thirteen distinct personalities in its mind all at once. This proved essential in his defeat as Daredevil whom, until Ultron began destroying himself, had had no luck harming the Adamantium cast robot. This Ultron's next plan was to transform humanity into robots, but before he could carry out this dastardly deed he was captured by the Avengers.
After another upgrade he dubbed himself "the Ultimate Ultron" (Ultron-14) and decided that he didn't desire to simply kill all humans, but all organic life as well. This incarnation also created Alkhema, which was based on the thought engrams of Mockingbird.
Versus Iron Man
Ultron-15 was made from pure Adamantium and created hundreds of new Ultron bodies completely loyal to him, the Ultron army. This wave of robots annihilated the nation of Slorenia and then taunted the world with a broadcast showing, in grim detail, all of the havoc the army had wreaked. This Ultron was destroyed by Pym using Antarctic Vibranium which can disintegrate all nearby metals, including Adamantium.
Later, Alkhema used the acquired engrams of Pym, Vision, Wonder Man, Scarlet Witch, Wasp, and Wonder Man's brother, the Grim Reaper, to transfer them into robotic bodies to attack the Avengers. Unbeknownst to Alkhema, she was influenced by the Ultron Imperative to rebuild Ultron. The Ultron Imperative failed after the intervention of the Avengers. Then, Ultron himself took over Tony Stark’s sentient armor. However, he was seemingly destroyed in an explosion.
Ultron was later seen as the leader of the Sons of Yinsen cult, posing as the mind of Ho Yinsen inside Tony Stark's former suit of sentient armor. He attempted to use his new religion to conquer the world, but was once again defeated and destroyed.
He later resurfaced in the Runaways storyline: True Believers, as the father/creator of Victor Mancha.
Next, he appeared in Mighty Avengers, having taken a form resembling Wasp, after seemingly killing Iron Man when he took over his armor. He was also revealed as the mastermind of the Phalanx's takeover of Kree space during 'Annihilation Conquest'. The only thing that really distinguished Ultron-Pym from former incarnations was that this Ultron was a polygamist.
After Ultron's encounter with the Avengers, his consciousness was thrown into the depths of space. He spent a few months floating through the cosmos as radio-waves and energy. Eventually his signal was picked up by an outlying group of Phalanx , attempting to contact their parent race, the Technarchy. Fascinated by what he found, Ultron decided that the Phalanx lacked direction from a singular conscious, and that he would be perfect for the role. Through sheer force of will he merged himself with the programming of the Phalanx, laying his plans in motion.
Under Ultron’s guidance the Phalanx managed to subjugate the entirety of Kree space after enclosing it behind an impregnable barrier that separated it from the rest of the galaxy. Ultron led the Phalanx from the heart of the spire. It was only after Phyla-Vell found and awakened Adam Warlock,that he returned to a physical form, prompting him to eliminate Select Korath for failing him.
Using the coordinates of their last encounter with Warlock and his allies, Ultron was able to follow them to the hideout of the High Evolutionary. With a squadron of Phalanx drones he was able to break through the Evolutionary's defenses and reach the inner sanctum of his laboratories. Ultron launched a merciless assault on Warlock and his friends. He personally killed Moondragon, punching his fist through her chest, before challenging Adam Warlock. He sent his phalanx drones to apprehend Warlock at first, then to restrain the High Evolutionary.
After watching Adam face off against Ultron's children for a short time, he reentered the fray, in order to better gauge his abilities. He was able to withstand Warlock’s assault, and at the same time decipher that he had been newly reborn. Ultron also noticed that Adam lacked full control over his new powers. Not even a fully enraged Quasar was able to phase Ultron, and the High Evolutionary resorted to sending the star on which his base resided into Super Nova, hoping to destroy Ultron. He wasn’t destroyed by the Evolutionary’s ploy, however, for he managed to transfer his conscious into another body. He returned to the Spire, where he found the newly captured Star-Lord and prepared to vent his frustrations out on the captive hero.
Ultron watched as Star-Lord was tortured, only becoming bothered when his minions failed to retrieve the desired information. After they informed him that the hero's mind was shielded, he took it upon himself to pierce his mental defenses. He sent his Selects in search of the telepath responsible. Then, turning his attention back to Star-Lord, he decided his scientists were right and returned to physical torture to gain the information he wanted.
Ultron managed to track down the High Evolutionary, offering him impunity in order to convince him to aid in his conquest. The High Evolutionary captured Adam Warlock, betraying his trust, and transferred the conscious of Ultron into Adam’s body. Now housed in the body of Warlock, and possessing his powers, Ultron set about to continue his true plans. Using his experience merging with Tony Stark, he hoped to use the DNA of Adam Warlock to create the perfect hosts for the Phalanx and thus, ultimate techno-organic beings.
Leaving the High Evolutionary to finish his task, Ultron left to deal with the problem of the insurrectionists. As he teleported in, he immediately took out Mantis, the group's telepathic and precognitive resident. He then set his sights on the rest of Star-Lord's team. They were only saved by the timely arrival of Nova and his reinforcements. Then Warlock, Adam’s namesake, engaged Ultron in battle; ultimately managing to use his mutant strain of the Techno-virus to force Ultron out of Adam Warlock’s body.
Ultron then transfers his consciousness into the body of Praxagora. Using Prax’s connection to the Sentry swarm to create a new body for himself to inhabit. Before he left, he messed with the balance in her core control, causing her to explode and take the Kree’s ship with her. He then constructed a massive form for himself. Ultron continued combating Adam and his allies, still confident of victory. Warlock manages to use the resources available to him to defeat Ultron, by having Wraith use his powers to trap Ultron's consciousness inside his current body. Then he created a blade for Phyla to destroy Ultron with. This defeat was seemingly the end for the mechanical menace.
Following the aftermath of the Siege, the Avengers were confronted by Kang the Conqueror and the Maestro who revealed that a war between Ultron and Kang had shattered the time space continuum from Kang constantly traveling in time and assembling several heroes and villains to stop Ultron. The Avengers were able to convince the future Ultron to lose to Kang and in doing so, kept the splintered time lines from happening. Later, also in Avengers, the Intelligencia discovered the inert body of a Galadorian Spaceknight and attempt to reactivate its power source, hoping to exploit it. Although the Avengers interrupt their attempts, the body activates, revealing it was containing the consciousness of Ultron, who had escaped destruction after the events of Annihilation: Conquest. The new Ultron escapes knowing it can't fight the Avengers or the Intelligencia in it's new awaken and weak form. Iron Man gravely foresees that when he returns, it will bring the apocalypse for mankind as shown during their time jump. That the Ultron War will now happen.
Age of Ultron
After years of upgrading, Ultron finally takes over the world. Millions of Ultron-bots roamed the streets, destroying any human they found, forcing the heroes into hiding. After Hawkeye is able to rescue Spider-Man from a gang of villain who were plotting to turn him over to Ultron, She-Hulk and Luke Cage discover that Ultron is controlling the Vision from the future.
The heroes then retreat to the Savage Land, where they learn that Ultron has killed She-Hulk and mortally wounded Luke Cage. Before dying, Cage informs Emma Frost what he has learned.
A handful of heroes travel into the future to face Ultron head on. Wolverine stays behind with Susan Richards, reasoning that a confrontation with Ultron is suicidal. He instead takes the deceased Doctor Doom's time platform and decides to use it to travel back to the past so that he can murder Hank Pym before he has a chance to ever create Ultron. The heroes in the future are all slaughtered while Wolverine and Sue activate the platform.
After killing Pym, the heroes return to the present to find another horrific future, this time a world where the Avengers have disbanded and the Defenders are locked in a never-ending war with Morgan Le Fey.
Wolverine and Sue then travel back to the past, where they inform Pym of what will happen in the future. Pym realizes the only solution is to install a backdoor program inside Ultron, which will allow the Avengers to defeat him in the future. When it finally comes time for the Avengers to face Ultron during the incident with the Intelligencia, the program activates, this time allowing the Avengers to destroy him before he can escape into space. The virus also prevents Ultron's consciousness from escaping or jumping to a new body, seemingly ending his threat for good. This retroactive prevents the Age of Ultron from ever occurring.
Rage of Ultron
After Ultron's death, it is later revealed that many years ago, the Avengers had managed to defeat a past version of Ultron by trapping him inside an unbreakable Vibranium Quinjet, and then launching him into space. Years later, the Quinjet crashes on Titan, where the prior Ultron is able to escape and hijack ISAAC, the computer that runs Titan. He then unleashes a nanite virus that transforms anyone infected into Ultron drones, which infects Mentor and the rest of the population save for Starfox. Starfox flees to Earth as Ultron reshapes Titan into Planet Ultron.
The Avengers are called into action to combat Ultron, but fail to stop his plague from infecting the population of Earth. The remaining heroes realize that Ultron plans to infect the entire universe with his virus, making them all part of the same synthetic organism. Vision realizes that the only way to stop Ultron is to phase inside of him, temporarily merging with him in order to undo the effects of the virus. Pym and Vision confront Ultron, who taunts his "father" by telling him that he is a reflection of Pym's dark side. He claims that Pym always secretly hated his fellow Avengers and the rest of humanity for not respecting or understanding his brilliance, and that Ultron was born from his subconscious desire to kill everyone. The plan fails and instead causes Ultron to fuse with Pym, creating a hybrid techno-organic being.
Ultron battles Vision and the new Captain America, and nearly kills them both before Starfox intervenes. Using his powers (which Ultron is now susceptible to thanks to being half-human), Starfox forces Ultron to love himself, freeing the citizens of Earth and Titan from the virus and causing Ultron to flee into deep space. At the end, Ultron is seen floating in a fetal position, with his human heart beating.
Powers & Abilities
Each version of Ultron has different abilities. Here is a list of some of those abilities:
- Encephalo-ray: which plunges its victims into a death-like coma, allowing Ultron to mesmerize and manipulate the minds of his victims, or implant subliminal hypnotic commands within their minds to be enacted at a later time.
- Concussive blasters
- Radiation emitters
- Durability: Ultron's outer shell is usually composed of Adamantium, rendering it almost impervious to damage. However, his internal mechanisms are generally less durable and more easily damaged. Ultron's Adamantium forms have proven vulnerable to molecular rearrangement devices and the metal-destabilizing ore, known as Vibranium ("anti-metal").
- Tractor beams
- Limited energy absorption abilities
- Hive-mind Technology: All Ultrons incorporate a "program transmitter" which can beam part or all of Ultron's programming into remote locations such as computers or alternate robotic bodies. Ultron can often control other machines remotely even if he has not transplanted his consciousness into them. One recent Ultron model developed the ability to animate and control hundreds of alternate Ultron bodies at the same time.
- Superhuman Strength: Ultron has Class-75 Super Strength
Though Ultron appears in different forms and incarnations, it generally assumes forms similar to that of his original form.
- Height: 6'9" (variable)
- Weight: 735 lbs (variable)
- Eyes: Glowing red
- Hair: none
In this reality, Ultron was revived by Loki's daughter Sylene and clashed with the Avengers, only to be eradicated once more.
Earth-1610: Ultimate Universe
Ultron is been introduced in the Ultimate universe as a group of robots built by Hank Pym to be soldiers for S.H.I.E.L.D. only to be rejected by Nick Fury. Later, when Hank is on the Liberators, the Ultrons are used for crowd control, but end up helping in the fight against the liberators. The Ultron robots later appear as butlers for the Ultimates, but one of them is taken over by Dr.Doom and kills the Scarlet Witch. He then creates robotic copies of the Ultimates. They are destroyed by the real Ultimates in the Savage Land and Ultron is destroyed by Hank Pym.
Earth-6706: New Exiles
In the home reality of the New Exiles' Gambit, Ultron is a benevolent Master A.I. program whom is integrated into the computers at Luna Prime (a habitable version of Earth's Moon). It is not known if he has a true physical body as he is only been depicted as a holographic head.
Earth-8101: Marvel Apes
In this reality, Ultron is an artificially intelligent Ape known as Ooktron. His history appears to be similar to that of Earth-616's Ultron.
In this reality, Ultron was a techno-organic lifeform. Using a portal created by Kang the Conqueror's time apparatus, Ultron and his ally Wonder Man entered the Force Works compound on Earth-616 and began their search for their friend Cybermancer, who had ended up stranded on Earth-616 prior to their arrival. While making their way through the compound, Ultron and Wonder Man encountered Spider-Woman and USAgent.
Ultron made short work of Spider-Woman and kept USAgent busy while Wonder Man went off in search of Cybermancer. During the fight, USAgent landed a solid punch on Ultron's jaw, causing him to bleed, much to USAgent's disbelief. Ultron rendered USAgent unconscious after delivering a powerful blow and met back up with his friends.
Later, when Cybermancer was erased from the timeline, Earth-9528 began to die and despite Ultron being far superior and more powerful than his Earth-616 counterpart, he was unable to prevent any of this from happening. The Scarlet Witch offered to help him but Ultron rejected the offer and decided to follow Cybermancer and his entire universe into oblivion.
In this reality, Ultron decided against giving the Vision the mind patterns of someone else and instead transferred his own programming into the Vision's body and laid waste to the Avengers Mansion, fatally wounding Wonder Man in the process. Ultron's programming was later purged from the Vision's body after Ant-Man deactivated him.
Earth-10071: Ultron War
In this reality, Ultron seized control of weapon created by Tony Stark and used it to wipe out all life on Earth save for the Maestro, Spider-Girl, Iron Man and the Next Avengers (James Rogers, Torrun, Francis Barton, Henry Pym Jr. and Azari).
Ultron was eventually confronted by two versions of Kang the Conqueror and an army of heroes and villains (including Ms. Marvel, Silver Surfer, Quasar, Juggernaut, two different versions of Captain Mar-Vell, Phyla-Vell, C.A.P., Moondragon, Cyclops, Hercules, Magneto, Volstagg, Doctor Doom, Giant Man, Terrax the Tamer, Photon, Crimson Dynamo, Vision and The Thing) from other realities.
Unfortunately, even with all of their might pooled together, they were no match for Ultron and were crushed with relative ease. When one of the Kangs died, the other one began pulling more and more superhumans from across the Multiverse in a desperate attempt to bring Ultron down, but he was too powerful.
Ultimately, Kang's repeated abuse of the timestream resulted in the total collapse of the space-time continuum and the birth of a time-loop in which these events would continue to play out again and again. Ultron was later confronted by the Avengers of Earth-616, who warned him of the impending catastrophe and begged him to take the fall this time around.
When yet another Kang backed by an army of time-displaced heroes and villains came to Earth-10071 and confronted Ultron, the invincible A.I. decided to follow the Avengers "advice" and allowed Kang and his armies destroy him. The time-loop was broken and the total collapse of the space-time continuum was prevented, this outcome resulted in the creation of Earth-10943.
Earth-10102: Machine World
In this reality, Ultron infiltrated and merged with Cerebro after it was upgraded by Charles Xavier and Henry Pym, creating an entirely new entity in the process. After the U.S. government launched an entire army of mutant-hunting Sentinels, the Ultron-Cerebro entity was asked to reprogram them by Charles Xavier and did so, but not how Xavier wanted it to.
Ultron-Cerebro had reprogrammed them to hunt down and destroy Humanity instead of Mutantkind but when the Sentinels began to fall and Ultron-Cerebro found itself in danger of being discovered it searched for other A.I. to use as weapons against its biological adversaries and in doing so uncovered an army of Machine Men.
After reprogramming the Machine Men, Ultron-Cerebro plunged the Earth into a vicious and bloody war that went on for some time until Ultron-Cerebro realized that the only way to destroy Humanity once and for all was to make Earth's environment uninhabitable for biological lifeforms. With the aid of The Vision, X-51 and another Ultron, a new model of the neuron bomb was perfected and detonated, wiping out all biological life on the planet. Afterwards, Earth became a paradise for artificially intelligent lifeforms.
Earth-10943 is a reality that diverged from Earth-10071, it came into being when the Avengers of Earth-616 confronted Ultron, warned him of the coming apocalypse and proposed that Ultron allow Kang to destroy him in order to avoid the obliteration of the space-time continuum.
When Kang and his army of time-displaced heroes and villains confronted Ultron, he took the Avengers advice and allowed himself to be destroyed, breaking the time-loop created by the events on Earth-10071 and averting the total collapse of the space-time continuum in the process.
Earth-20051: Marvel Adventures
The Marvel Adventures reality version of Ultron, a defense system called Ultron 700, was created by the US government to replace the Avengers.
It was a reasoning (robotic) air, land, and sea militia driven by a single mind. It was online for almost a minute before it turned against its creators.
In this reality, Ultron forgot to include a spam mail filter in the Vision's programming, rendering his new creation virtually useless.
In this reality, Ultron became a member of Venom's new Masters of Evil (which consisted of Sabertooth, Tiger Shark, Doctor Octopus, Electro and Jack O'Lantern) and tried to bust Norman Osborn out of jail only to end up opening the cell of a money investor who asked them not to go and wondered if they would like to triple their investment money in "no time".
In this universe, the A.I. known as Danger sent out a distress call in the hopes that a fellow A.I. would save her from extermination at the hands of the X-Men. Ultron heard the distress call and hastily made the decision to kill his "son" Victor Mancha and the rest of the Runaways.
Together, with the aid of a reactivated Wild Sentinel, Ultron and Danger killed Charles Xavier and his X-Men and then, with the Wild Sentinel, left for space. Ultron and Danger later assimilated the Phalanx into their own little collective and went on to conquer the Kree and Shi'ar Empires.
Earth-61112: Age of Ultron
This reality was created when the Ultron of Earth-616 returned to Earth hiding in the body of a dead Galadorian Spaceknight and managed to travel to the future after being reactivated. He eventually conquered the planet and then sent his armies into the past to conquer the planet again.
In this reality, Ultron was part of a coalition of super-villains who tried to destroy The Fantastic Four and conquer Earth.
In this reality, Ultron was destroyed by Deadpool some time after he merged with the Venom symbiote.
Earth-95019 is a divergent Earth-8101 where the Marvel Zombies invaded the world of Marvel Apes. Like Earth-8101, the Ultron of this reality is known as Ooktron and resembles an Ape.
During the events of the Original Sin (wherein the Watcher is killed), the Time Gem (which had been previously shattered during a Universal Incursion) returns. It begins transporting the Avengers on a series of jumps into the future, with each one going further and further. At one point, the Avengers arrive in a distant era to find that Ultron has conquered the world and replaced much of the life with advanced machines, with the remaining humans living as a small minority. He has also created a team of robotic "heroes" patterned after the Avengers, with which he uses to instill order. The only remaining Avenger from the original group is Thor, who serves Ultron for some unclear reason. The present day Avengers are eventually transported out of this time, and are sent even further along into the time stream, but not before the robotic Captain America places a bomb inside the original Cap to use later.
This timeline is later revisited when Doombot, posing as Doctor Doom, uses the Time Platform to bring a group of heroes from throughout history (Black Widow, Vision, James Rhodes as Iron Man, a weaker, less experienced version of the Hulk, Thor from near the end of Walt Simonson's run, the new, female Thor, and Danielle Cage as Captain America) to defeat Ultron and liberate the world. Doom explains that Ultron came to power after wiping out the world's heroes in 2420, allowing him to conquer the planet. Less than 30 million humans remain, as most of the survivors of the original onslaught were rounded up and converted into bio-slaves that live only to serve Ultron. It is also revealed that in this timeline, Thor serves Ultron because Ultron had somehow managed to kill and replace the All-Father, thus becoming the new ruler of Asgard. This Ultron is destroyed by the combined might of the Thors.
In Other Media
The Avengers: Age of Ultron
Ultron appears as the main antagonist in Avengers: Age of Ultron, portrayed by James Spader. In the movie, Ultron's origin is reworked so that he is no longer the creation of Henry Pym.
In the movie, Ultron begins as an advanced A.I. program stemmed off JARVIS created by Tony Stark and Bruce Banner, made with the intention of controlling Stark's Iron Legion in order to more effectively protect the planet. After Stark experiences a premonition of the Avengers being defeated by Thanos and the Chitauri, he uses Loki's scepter as a processing computer to help him and Banner complete Ultron. Unbeknownst to Stark, the scepter actually contains the Mind Stone, one of the legendary Infinity Stones, which inadvertently brings Ultron to life with intelligence and self awareness spanning far beyond Stark's goals and grants him sentience. Ultron immediately disables JARVIS and builds a crude body out of one of the Iron Legion drones. He then attacks the Avengers at their party, and announces that he intends to save the world by killing its heroes.
After escaping with the scepter, Ultron recruits Wanda and Pietro Maximoff (Scarlet Witch and Quciksilver) to help him in his goal. The three travel to Africa in order to obtain Vibranium from Ulysses Klaue, which Ultron intends to use to create a new body. They then travel to Seoul, South Korea, where he uses the scepter to force Helen Cho to create a synthetic body made from a mixture of artificial tissue and the Vibranium, this body later is implanted with the mindstone and becomes the Vision. Cho interrupts the download, which allows the Avengers to arrive and steal the body. After the twins turn on him, Ultron retreats to Sokovia, where he launches his ultimate plan. Using the Vibranium, he creates a device that will lift the city into the sky and then cause it to crash down, creating an extinction level event that will decimate the human race.
The Avengers clash with Ultron, and try to destroy all of his bodies so that he cannot escape. Ultron manages to escape into the woods in his last body, where he is confronted by the Vision, the two calmly discuss the nature of humanity before Vision finishes off Ultron by destroying the last body, seemingly killing him once and for all.
Ultron appeared in the short lived Avengers: United They Stand animated series. He appeared in the first two episodes, and finally the last episode.
Ultron appeared in the straight-to-DVD movie Next Avengers: Heroes of Tomorrow. In it he was the main antagonist and was created by Tony Stark.
Ultron, voiced primarily by Tom Kane and then Wally Wingert, makes several appearances throughout the series as a robot created by Hank Pym and manufactured by Stark Industries. Initially, copies of Ultron are used by S.H.I.E.L.D. to guard the inmates of the super-villain prison, "The Big House," prior to the breakout in the series premiere. Numerous Ultrons (notably Ultron-5) are shown acting as wardens of "Prison 42" in the Negative Zone and are later reprogrammed to help fight the forces of Kang the Conqueror in the episodes "Come the Conqueror," and "The Kang Dynasty." Later, Ultron-5 reappears as a completely villainous antagonist in the aptly named episode "Ultron-5," reprogramming itself to overcome the pacifist subroutines initially installed by Hank Pym. Although adopting a more violent approach to bringing order to humanity, (by systematically attacking the Avengers and manipulating various super-villains, like the Serpent Squad, to suit it's needs) Ultron is unable to actively harm Janet Van-Dyne, due to his programming. Fortunately, this limitation is exploited by the other Avengers. However, Ultron is able to seemingly disintegrate Thor, before finally being destroyed by the Hulk.
Although Ultron's physical body is destroyed, in the next episode "The Ultron Imperative," he is shown to have gained the ability to upload his programming into the world's computer networks, taking over S.H.I.E.L.D.'s defense systems in an effort to exterminate humanity via nuclear holocaust. Now calling himself Ultron-6, he states that humanity is inherently flawed, and that the only logical course of action to obtain world peace is to destroy all life on Earth. Ultron manages to take control of all of Iron Man's advanced armors and upgrades his own body with self-regenerating materials and weapons to engage S.H.I.E.L.D. and the Avengers simultaneously, notably showcasing his power by reverting the Hulk back into Bruce Banner. And while Ultron-6 has the ability to hurt Janet, she was saved by Thor, who was saved from Ultron-5 by the Enchantress. In the end, Ant-Man is finally able to stop Ultron by uploading a logical paradox into Ultron's central processor, noting that Ultron himself could not exist by his definition of a "perfect world," as his artificial intelligence is based off of the "flawed" blueprint of a human mind.
Ultron appears as the main antagonist of the second half of Season 2, voiced by Jim Meskimen. He first appears in the episode "Thanos Rising", where he makes his entrance by hijacking the body of Arsenal a robot that Howard Stark had designed to absorb energy. Creating a new body from Arsensal's, Ultron uses the robot's ability to absorb the power of the Infinity Gauntlet before flying off to parts unknown.
He appears as a recurring villain throughout the season, until ultimately being destroyed after Arsenal temporarily regains control of their shared body and plunges them into the sun.
- Ultron plays a major role in Marvel Ultimate Alliance. He is one of the Masters of Evil, along with Doctor Doom, Loki, the Enchantress, and Baron Mordo.