The Eradicator is a fictional comic book superhero (and sometimes supervillain) character having a recurring role in Superman stories published by DC Comics. Originally created as a weapon by an ancient alien race, he is over 200,000 years old and is considered an artifact of Krypton. The character was created by writer Roger Stern, and first appeared in Action Comics Annual #2 (1989).
The Eradicator first appeared in Action Comics Annual #2 in 1989. The Day of the Krypton Man story arc prominently featured the Eradicator in the pages of Superman, Adventures of Superman, and Action Comics. The story arc ran for six issues cover-dated March and April 1990, and was collected in Superman: Eradication! The Eradicator reappeared in Superman: The Man of Steel #1 as a humanoid being composed of energy.
In June 1993, the character, appearing as Superman or The Last Son of Krypton, was the featured character in Action Comics through the Reign of the Supermen story arc, beginning with Action Comics #687-689. The character was "resurrected" in Action Comics v.1 #693 and then featured regularly in Outsiders, first appearing as a member of the team in issue 3. The character was featured in his own three-issue eponymous limited series in 1996.
In the distant past, a dying alien race creates a number of containment devices in which to preserve their culture. They send them into space with contact teams, intent on meeting other civilizations. When a small group of these aliens arrive on the planet Krypton, they are met by the militant Kem-L, who kills them and corrupts one of the devices. Its new mission is to preserve his ideal of Kryptonian culture by eradicating all others — and thus the device becomes known as the "Eradicator."
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Official Site: DC Comics
Links: Wikipedia Entry Eradicator Profile DC Database Profile