The Eradicator was originally a 200,000 year old Kryptonian artifact and weapon, who later evolved to become a sentient, humanoid being with many, if not all, of Superman's powers. He wishes to force Kryptonian culture on Superman and on Earth; However, his contact with Superman has turned him into a hero of sorts. The Eradicator was created by writer Roger Stern, and first appeared in Action Comics Annual #2 (1989).
The Eradicator's body was created from the genetic template of Superman's, when Superman died at the hands of Doomsday, making him Kryptonian. Being that, the Eradicator possesses similar powers to that of Superman, such as incredible strength, speed, invulnerability, heat vision and flight. He also possesses ultra acute senses but to a limited degree. Being a program from Krypton, the Eradicator possesses extensive knowledge of Krypton, is extremely intelligent, as well as the ability to compute and process information at incredible speed.
But what distinguishes the Eradicator from other Kryptonians is his ability to manipulate energy. Eradicator has vast energy manipulation abilities, ranging from being able to absorb, convert and release various forms of energy as powerful blasts from his hands or eyes.
Although he has enhanced senses, the Eradicator once had to wear a special visor designed to cut down visible light, since his eyes were particularly sensitive to it.
In the distant past, a dying alien race created a number of devices to preserve their culture and sent them into space where they would encounter other civilizations and link their colonies. When a small group of these aliens arrived on the planet Krypton, a militaristic faction, led by Kem-L, killed them and corrupted one of their devices to preserve his ideal of Kryptonian culture; this device would eradicate alien influences, and hence Kem-L called it the "Eradicator."
One of the surviving aliens, the Cleric, took the Eradicator and a group of followers and left Krypton. Unfortunately, his followers died shortly after leaving; Kryptonians have a genetic link to their planet, and will die if they leave it.
The Cleric kept the Eradicator for 200,000 years, until he encountered Superman on Warworld. With the device, the two exchanged memories, and the Cleric had a vision of Superman's death at the hands of Mongul. The Cleric wished to prevent this from happening, and the Eradicator transported them to his asteroid. He noticed that the device changed to protect Krypton's sole survivor, and they used it to heal their wounds, both physical and spiritual. When the Cleric gave the Eradicator to Superman for safekeeping, the old alien passed away.
The Eradicator's Fortress
Back on Earth, the Eradicator caused a number of bizarre events, including altering Jimmy Olsen into a malleable form, causing him extreme pain in the process. Superman threw the device into Antarctica, where it altered the ice to create the Fortress of Solitude, and possessed two scientists to create a portal to the Phantom Zone, where it drew Kryptonian artifacts to the Fortress.
When Superman recovered the Eradicator, he learned that one of his ancestors, Kem-L, created it to prevent aliens from influencing Kryptonian culture. The Eradicator tried to transform Earth into a new Krypton, and erased Superman's memory of the device when he tried to interfere.
Professor Emil Hamilton, who had previously examined the Eradicator, restored Superman's memory, and Superman then went into the Phantom Zone to stop the device. He encountered a projection of Kem-L and learned that only the House of El can control the Eradicator, but he first had to undergo a rite of passage. When Superman completed it, he commanded the Eradicator to shut down, and it complied.
The Krypton Man
In the Day of the Krypton Man arc, the Eradicator altered Superman's psyche, turning him into the ideal Kryptonian and alienating his closest friends. Superman nearly killed Draaga, and when he tried to kill Jonathan and Martha Kent, he broke the programming, fought the Eradicator, and threw it into the Sun.
The Eradicator returned in Superman: The Man of Steel #1 as an energy being. It tried to turn the Sun into a red dwarf (the type of star that Krypton once orbited), but Superman stopped it with help from Professor Hamilton.
The Last Son of Krypton
The Eradicator returned again in Action Comics #687 (June 1993), part of the Reign of the Supermen story arc, as "the Last Son of Krypton." It created a body for itself based on Superman's, and even briefly believed itself to be a Kryptonian. In point of fact, it had deluded itself into believing it was Superman himself. As a humanoid, the Eradicator joined forces with Superman to fight the Cyborg and stop him from destroying Metropolis. This was the second encounter between the two, as the Cyborg had nearly killed the Eradicator in a battle during the obliteration of Coast City. While it's humanoid body was being healed, robots from the Fortress revealed to the Eradicator it's true origins. It was seemingly killed in an attempt to shield Superman from a lethal blast of Kryptonite-based fuel, fully recharging the Man of Steel's powers in the process.
Following Superman's return, the Eradicator's apparently dead body was examined at S.T.A.R. Labs, and merged with Dr. David Connor. The merged Eradicator joined the Outsiders, and occasionally teamed up with Superman. In a 1996 three-part miniseries, the Eradicator dealt with Dr. Connor's personal life, and more of the device's history was revealed, some of which is hard to reconcile with the history from the annual.
The original Eradicator program was revealed to still exist in the Fortress of Solitude's computers and, following the destruction of the Fortress in Superman's battle with Dominus, the Eradicator program took the form of Kem-L, and again attempted to brainwash Superman. The David Connor Eradicator realized that the program was still active, and merged with the remains of the Fortress to control it.
The Fortress-Eradicator took the form of a gigantic Kryptonian battlesuit, and gained a form of multiple personality disorder based on his conflicting programming. When it learnt of the "Krypton" Krypto came from, the shock to the original directive of Kryptonian purity was enough to bring this into control, leading to his hunting down the dog as an anomaly that should not exist. Superman held him in suspended animation in his new Fortress, eventually telling him Krypto's full origin once he had learned it himself.
Most recently, the Eradicator returned to his humanoid state of being. He wears a new outfit which, like the "Krypton Man" costume, is a combination of elements from Superman's costume and Kryptonian robes. He has gained the ability to sense beings that should not be in the DC Universe, such as Mr. Majestic, which may be related to his original programming against alien influences. How his origin has been affected by the Superman: Birthright retcon is unclear.
One Year Later
The Eradicator's fate during the One Year Later storyline (which is set one full year after Infinite Crisis) is unknown. A recent Superman story arc suggests he has turned into a villain, in a possible future.
The aborted Superman movie script, 'Superman Lives', features The Eradicator as a major character.
In the script, it is revealed that The Eradicator was created by Jor-El to probe the core of Krypton to determine if it was going to explode. Additionally, The Eradicator was secretly the rocket that took a young Kal-El to Earth as a baby.
Brainiac's primary mission was also to hunt down the Eradicator and assimilate his technology, using it to create a more stable body for himself.
The Eradicator brings Superman back to life after he's killed by Doomsday. From that point on, the Eradicator becomes Superman's companion of sorts. At first, he doesn't understand Superman's emotional reactions and feelings of caring for humans. However, as the story goes on, the Eradicator begins to understand further Superman's motivations and feel them himself.
The Eradicator also becomes a mechanical, armored suit for Superman, simulating his powers for him, which are temporarily not working due to the sun being blocked out by Lex Luthor.
Unfortunately, the Eradicator gives his life to destroy the machine blocking the sun, thus restoring Superman's powers.
- The Superman Database - Full list of every issue of "Eradicator" ever published w/ cover art, plots, and more.