Stories often end in Ultron's destruction, only for new offshoot iterations of the robot to be built of varying morals, including the superhero Ultron-12 (Mark Twelve).

Debuting in the Silver Age of Comic Books, Ultron has since featured in Marvel products across different media, such as animated television series and video games.

[8] Later, Ultron-5, the Living Automaton leads his own version of the Masters of Evil (consisting of Black Knight, Klaw, Melter, Radioactive Man, and Whirlwind) against the Avengers, having hypnotized Edwin Jarvis into working for him as the first Crimson Cowl.

[14] After being recreated as Ultron-11 by the Beyonder and battling in Battleworld,[15] the Thing brings Ultron's head back to Earth as a souvenir, and is forgotten when there is an attack by the alien Dire Wraiths.

[16] Ultron-12 enters an alliance with the Grim Reaper and his allies (Nekra, the Erik Josten Goliath, Man-Ape, and Black Talon) in a bid to destroy Wonder-Man.

[19] After its defeat,[20] Ultron-13 attempts to obtain a new form of vibranium called Nuform, but it is repelled by the combined efforts of Iron Man, Black Panther, and Spider-Man.

[28] When Marvel launched a new title The Mighty Avengers by Brian Michael Bendis and Frank Cho, Ultron interfaces with Iron Man's armor, which had been integrated with Tony Stark's biology.

Kang the Conqueror attempts to enlist them to defeat the robotic foe but another group of heroes and villains, plucked from all over time and space, ends up destroying this version.

[34] Later, also in Avengers, a cabal of super-intelligent supervillains discover a Galadorian Spaceknight's inert body and attempt to reactivate its power source, hoping to exploit it.

Although the Avengers interrupt their attempts, the body activates, revealing that Ultron's consciousness was contained within and had escaped destruction after Annihilation: Conquest.

[40] It is later revealed that the Avengers had trapped an unidentified iteration of Ultron in deep space years earlier, sealing him inside a Vibranium Quinjet.

Ultron is defeated when Starfox's powers force love onto himself, causing the part of that is now Pym to accept his old weakness and flaws while the villain has a mental breakdown and flees into space.

[42] He later returns to Earth, where the Wasp and Captain America discover that Ultron has taken complete control and is using Pym's face to fool his maker's old friends.

Upon being alerted to the approach of Sam Wilson's task force by a robot version of Jarvis, Ultron decides to give his "family" a warm welcome.

Ultron argues that he is doing this because the Avengers have become less of a family over the years as so many of them jump to obey Captain America or Iron Man despite past experience confirming that this should be a bad idea but the Stark A.I.

To combat him, 2549's Ant-Man went back in time to enlist the past versions of Hank Pym, Scott Lang, and Eric O'Grady for help and brought them to 2549.

While paranoid after being Ultron's "meat puppet", Hank Pym allied with Black Ant and they formed their version of the Lethal Legion by killing and reviving select villains.

In the nick of time, Wasp, Moon Knight, and Ultron-12 receive aid from Ant-Man, Mayor Luke Cage, Nadia van Dyne, Stinger, Valkyrie, and Vision to fight the possessed Lethal Legion.

After Hank and the Lethal Legion leave to regroup in Sub-Atomica as part of Protocol S, Vision scans Mark Twelve's body and finds no trace of Ultron in him.

[55] The visual appearance and powers of the character have varied, but common powers include superhuman levels of strength, speed, stamina, durability, and reflexes; flight at subsonic speeds; and various offensive weapons such as concussive blasts of energy fired from its optical sensors or hands and an "encephalo-ray", which places victims into a deathlike coma.

The latter ray also allows Ultron to mesmerize and mind-control victims, or implant subliminal hypnotic commands within their minds to be enacted at a later time.

[57] Ultron also used an internal molecular rearranger that renders the adamantium components of its workings more malleable and so has the ability to restructure its physical form.

He also uses the device in ways its own creator never dreamed, such as converting matter into energy and back by sheer force of will, something Ultron 6 often made use of during his battles with the Avengers.

[18] Ultron's travels through outer space have greatly expanded upon the mad machine's intellectual and mechanical capacity in new and intriguing ways.

[41][61] Ones powerful enough to commandeer whole planetary and even universal expanses in a single inning, on top of his natural ability to invent and fabricate the most sophisticated of mechanical systems ever conceived.

[62] Through his vast technoformative abilities, Ultron could change and morph entire areas into sprawling masses of cables, pipes and transorganic metal that moved about in any given direction he willed it.

[41] This effect gained more prominence with the more excess mass he could assimilate with his power, having once taken a slew of transmoded Kree Sentries into a massive body which reflected his physical likeness.

[65] Besides being able to grow to incredible heights in seconds, Ultron can shrink down to sub-quantum scale to shift between dimensions via accessing the Microverse or the Quantum Realm.

The Fantastic Four storyline "Death of The Invisible Woman" features an advanced humanoid called Alex Ultron, a member of the futuristic Last Defenders.

As a result, Ultron instead became obsessed with bringing about the extinction of all life on Earth after concluding that humans are slowly killing the planet.