Ultron is the Avengers' greatest enemy. One reason for the enmity is that the villainous android was created by one of Earth's Mightiest heroes — Dr. Hank Pym, aka Ant-Man. Robots created by humans going rogue is a common soft sci-fi trope, an evolution of Mary Shelley's Frankenstein.
However, this story of creation doesn't end with Ultron himself. Since the villainous AI's ultimate goal is to supplant humanity, Ultron has created other androids in his image. Several of these androids have become important characters in their own right.
5 The Vision Is The First And Most Famous Of Ultron's Creation
When noted Golden Age aficionado Roy Thomas wrote The Avengers, he wished to replicate the reintroduction of Namor & Captain America by adding the bygone Timely Comics hero The Vision to the team. That Vision, real name Aarkus, was an alien visitor from "Smokeworld." Per Stan Lee's suggestion, Thomas introduced a new Vision, one with the same name and appearance as Aarkus, but with a much different origin. That origin was revealed in Vision's debut The Avengers #57 — an android created by the then-recently introduced villain, Ultron-5.
Ultron had created the Vision to lure the Avengers to their doom, but the Vision turned on his master and was made an Avenger in the following issue— his reaction proved even an android can cry. Since his introduction, The Vision has been a staple of the Avengers. Thomas' successor, Steve Englehart, would call back to Vision's Golden Age roots by revealing Ultron created his body from the remains of the original, android Human Torch. Thanks to the android Vision's storied comics history and his transition to film with the MCU, he's long since eclipsed the Golden Age Vision in fame. That said, the MCU did change Vision's origin — his body was meant for Ultron, but the Avengers swiped it and uploaded JARVIS into it instead.
4 Ultron Attempted To Create A Robotic Bride With Jocasta
Ultron's fourth major appearance was a two-part story told across Avengers #161-162 (written by Jim Shooter, drawn by George Pèrez). Collectively known as "The Bride Of Ultron," the android first brainwashes his creator into attacking the other Avengers, then using the team's disorientation to ambush and defeat them single-handedly. With the Avengers out of the way, Ultron begins his true plan – directing the still brainwashed Hank Pym to transfer Janet Van Dyne/The Wasp's mind to an android body, ostensibly to save her life but in truth to give Ultron a mate: fittingly named Jocasta.
The plan is only stopped when during a scuffle between the Avengers and Ultron, Iron Man threatens to destroy Jocasta — the gynoid's shell is taken to the Avengers Mansion for storage. A few issues later, in Avengers #170, Ultron remotely activates Jocasta, but in the end, she turns on him too. While Jocasta has been destroyed a handful of times, the one quality she inherited from her maker is a knack for revival.
3 Alkhema Was Ultron's Second Attempt At A Mate
Dissatisfied with how Jocasta turned out, Ultron enacted a second attempt at creating a mate in Avengers West Coast #90 (written by Ultron co-creator Roy Thomas, drawn by David Ross). He again used the brain patterns of a female Avenger as the personality basis for his mate — in this case, Bobbi Morse/Mockingbird. The result was Ultron's third android creation — Alkhema. Unlike Vision and Jocasta, Alkhema did not join the Avengers against her creator and never learned the value of humanity, remaining dedicated to Ultron's goals of destruction.
However, this doesn't mean that Alkhema was a loyal mate. If anything, she was even more sadistic than Ultron, and favored the personal, individualized killing of humanity instead of efficient mass slaughter. Thus, Ultron's creation once again turned on him — in Kurt Busiek & George Pérez's Ultron Unlimited, Alkhema attacks the Avengers in hopes of denying Ultron the satisfaction of destroying his mortal enemies.
2 Ultron's Second Son Was Victor Mancha
Created by Brian K. Vaughan & Adrian Alphona, The Runaways follows a group of teenagers who discover their parents are all super-villains. A later addition to the team, Victor Mancha, is no different — he's the second son of Ultron. Victor was created through a combination of DNA from his mother, Marianella Mancha, and Ultron's nano-technology.
Victor's destiny is to become "Victorious," the villain who will one day destroy the Avengers and conquer Earth. The Runaways tracked down Victor and recruited him to stop this from unfolding. Ultron, infuriated his plans for Victor to infiltrate the Avengers has been ruined, takes control of Victor, but the Runaways still triumph. Victor, aware of his destiny, fears that "Victorious" will come to pass until he dies at the hand of his brother, The Vision, in Tom King and Gabriel Hernandez Walta's Vision series.
1 In Avengers: Earth's Mightiest Heroes, Ultron Created Facsimiles Of The Avengers
When Ultron returned in Season 2 of Avengers: Earth's Mightiest Heroes, his goal had shifted from simply annihilating life on Earth to repopulating the planet with machines of his own ilk. To begin with, he starts abducting the Avengers one-by-one and replacing them with robotic duplicates — as a nod to the comics, he intends to place Wasp's mind in Jocasta, but never gets the chance. It's likely the idea of android duplicates comes from two sources. One is Ultron Unlimited, the comic storyline sharing a title with the Earth's Mightiest Heroes' episode — the comic storyline featured Ultron reanimating the slaughtered citizens of Slorenia as robot zombie shock troops.
The other is Next Avengers: Heroes Of Tomorrow, written by Earth's Mightiest Heroes show-runner Christopher Yost. In that movie, Ultron killed the Avengers before Iron Man whisked away the team's children to safety. While the children grew, Tony built "Iron Avengers," androids modeled after his dead teammates to one day fight Ultron. Ultron, however, takes control of the androids and sets them against the heroes.