Alexander Joseph "Lex" Luthor is one of the main antagonists of the DC Universe, specifically serving as one of the main antagonists of both the Superman and Justice League franchises.
He is the archenemy of Superman and one of the most iconic members of the Man of Steel's rogue's gallery, alongside General Zod, Brainiac, Doomsday and Darkseid. He also serves as a recurring adversary to the Justice League, being the leader of many supervillain groups, most notably, the Legion of Doom and the Secret Society of Super Villains.
Initially depicted as a war profiteer and later a mad scientist, Lex was eventually rewritten as a genius billionaire and the founder and CEO of LexCorp, ruling over a vast criminal and legitimate business empire in Metropolis, earning him great power and influence. Following Superman's debut to the world, he would become his sworn archenemy, viewing the Man of Steel as a threat to both his criminal operations and humanity at large; at the same time, he is deeply jealous of his nemesis' abilities and popularity, fueling his obsession with usurping him as humanity's savior and protector overall.
Over the years, Luthor's characterization has often shifted from being a ruthless mastermind and at other times, a misguided anti-hero/anti-villain. However, his unwavering animosity towards Superman has remained constant throughout. His high profile as a supervillain has also put him into conflict with many other heroes of the DC Universe, including Batman and various members of the Justice League.
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New Earth comic
As US president
Superman: Birthright
Prime Earth comics
As God of Apokolips
Lex as Gene Hackman in Superman 1978 film
Lex as Kevin Spacey in Superman Returns
Lex in promotional poster of Batman vs Superman: Dawn of Justice
Lex injecting himself with Kryptonite in Batman/Superman: Public Enemies
Crisis on Two Earths
John Shea in Lois and Clark
Michael Rosenbaum as Lex Luthor in Smallville
Jon Cryer as Lex Luthor in the Arrowverse
Lex Luthor as seen in Superfriends as the leader of the Legion of Doom
Lex Luthor as he appears in Superman: The Animated Series
Lex Luthor as he appears in Krypto the Superdog the cartoon series