This revised origin makes Luthor's fight with Superman a personal one and suggests that if events had unfolded differently, Luthor might have grown to be a more noble person. Luthor's ego preventing him from personal growth and the tragedy that he and Clark could have been a force for good together are played up in various stories throughout the 1970s and 1980s, particularly in Elliot S. Maggin 's novels Last Son of Krypton and Miracle Monday.