Earth-Three

In much the same way that Superman and other heroes have evil analogs on the parallel world of Earth-Three, Lex had a heroic counterpart there; he reluctantly decides to adopt a heroic identity to combat the evil Crime Syndicate of America. Lex, who eventually married the Lois Lane of Earth-Three, dies in Crisis on Infinite Earths, but is survived by their son, [http://en.wikipedia.org/wiki/Alexander_Luthor,_Jr. Alexander Luthor, Jr.], the future antagonist of Infinite Crisis.

In the JLA: Earth 2 graphic novel, an updated version of Earth-Three and its version of Lex were reintroduced to the post-Crisis DC Universe. Unlike the pre-Crisis version, this Lex does not sport a goatee, resembling more in appearance to the pre-Crisis Earth-One version from the 1983s Action Comics (including the green battlesuit). In this version of events, the heroic Lex traveled from his Earth (located in the anti-matter universe rather than being an alternate positive-matter one) to the mainstream DC Earth, posed as his villainous counterpart, and subsequently asked the Justice League to help him rebuild his world. However, since "evil always wins" in this alternate world, the attempt failed, and Lex resigned himself to being the only noble character on his Earth, although the Syndicate Rules story arc in JLA featured another group of heroes named the Justice Underground; there was also a mention of the Luthor of Earth Two awaiting a mock trial before his public execution. At the end of the story, the JLA released all the CSA's prisoners before returning to Earth One. It is not known, although very probable, that Lex was among the released prisoners.
 * Alexander Luthor, Jr. is the son of Earth-Three's Lex. Before his world was destroyed, he was sent to the monitor where he rapidly aged to adulthood. Along with Kal-L, Lois Lane, and Superboy-Prime, he saved the newly formed merged universe before disappearing into a paradise dimension. They later returned as the antagonists of Infinite Crisis. Alexander_Luthor_Earth_3-1-.png