In the second of the Superman: Earth One graphic novels, Dr. Alexandra Luthor and her husband Dr. Alexander Luthor are a pair of brilliant scientists who refer to themselves as Lex Incorporated. While working with the military, Alexandra researches ways of killing Superman as an intellectual exercise, while Alexander is more compassionate and questions the ethics of developing weapons to harm a man who has not given cause to be feared. In the third installment, Alexander sacrifices himself to help Superman battle Zod. Alexandra is consumed by grief, blaming the Man of Steel and vowing to destroy him. Claiming the "old Alexandra" died alongside her husband, she adopts the new name "Lex."