More important to comic book fans, audiences learned how Edge was managing to vacate human consciousnesses from their bodies and replace them with Kryptonians: a device, invented by Superman and Edge’s mother, named The Eradicator.
In the TV series, The Eradicator is a device invented by Superman’s mother, intended to save the minds and souls of Kryptonians after the destruction of the planet.
In the comics, The Eradicator is a Kryptonian AI, invented by a distant relative of Superman’s, which was responsible for the deaths of billions when Krypton was destroyed, because it had created a genetic link between Kryptonians and their planet, preventing them from leaving the world.
After bringing it home to his apartment, The Eradicator briefly took control fo Superman, turning him into The Krypton Man — a character who wanted to wipe out Earth and terraform it to suit Kryptonian biology .
After Superman died, there were four “Supermen” who appeared to replace him: a teenage clone , John Henry Irons, and The Eradicator.