What is the name of this fictional supervillain appearing in American comic books published by DC Comics that Clark Kent fights in New York in the novel "It's Superman!?"
It's Superman!: It's Superman! It's Superman!:  is a novel by Tom De Haven based on the comic book superhero Superman. It's Superman!:  The premise tells the tale of Clark Kent's beginnings into becoming Superman, set in the 1930s, where Clark befriends a wrongly convicted photographer named Willi Berg, and is then taken from Kansas to Hollywood and finally in New York where he meets Lois Lane, fights Lex Luthor, as he debuts in his superhero persona. Lex Luthor: Alexander Joseph "Lex" Luthor is a fictional supervillain appearing in American comic books published by DC Comics, though on occasions he has established himself as an antihero.
Lex Luthor