Last Son of Krypton is Elliot S. Maggin's first Superman novel. It tells the "life story" of Superman; from his birth on the planet Krypton, to his childhood in Smallville and his career as Superboy, to his arrival in Metropolis and his career as Superman. The main antagonist in this story is a mysterious alien ruler with ties to Superman's past. Superman and his greatest enemy Lex Luthor must join forces to retrieve a document written by Albert Einstein and stop the alien ruler.