In the conclusion of the three part arc, Lois and Clark learn that Leslie Luckabee claims to be Lex Luthor's long lost son, and is bent on finishing what Lex Luthor started... marrying Lois and killing Superman. Leslie Luckabee and Mr. Smith, who turns out to be the REAL Lex Luthor Jr, also find out Superman's identity, when they replay a tape recorded by Lex Luthor, revealing Clark Kent is Superman.moreless