Lex Luthor was created by Jerry Siegel and Joe Shuster on a Wednesday.
During the 12-issue limited series Crisis on Infinite Earths, Luthor allies himself with fellow Superman foe Brainiac to recruit an army of supervillains spanning the DC Multiverse
 A famous non-canonical "imaginary story" from 1961 entitled "The Death of Superman" has Luthor finally succeed in killing Superman after pretending to reform and befriend him

