DC Database

How are you even Superman's number-one villain?! A robosuit?! We have like...eight of those in the Batcave!
Robin src

Lex Luthor was the arch-enemy of Superman.

Luthor called Carpenter, requesting she coat his office with Kryptonite.[1] Later, Lex would battle his arch-nemesis, Superman, during a confrontation between the Society of Super Villains and the Justice League of America.[2]


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Footnotes

Justice League Villain

This character has been primarily an enemy of the Justice League, in any of its various incarnations. This template will categorize articles that include it into the category "Justice League Villains."

Secret Society of Super-Villains member
This character is or was a member of the Secret Society of Super-Villains, a cadre of super-villains who band together to accomplish feats no one super-villain can do alone, in any of its various incarnations. This template will categorize articles that include it into the "Secret Society of Super-Villains members" category.

Superman Villain(s)

This character has been primarily an enemy of Superman in any of his various incarnations, or members of the Superman Family. This template will categorize articles that include it into the "Superman Villains category."