Lionel Luthor is a fictional character portrayed by John Glover in the television series Smallville. The character was initially a special guest in season one, and became a series regular in season two and continued until being written out of the show in season seven. The character returned to the show in season ten again in a special guest role as a parallel universe (Earth-2) version of the character. In Smallville, Lionel Luthor is the father of Lex Luthor (Michael Rosenbaum), and founder and CEO of LuthorCorp. Lex Luthor's father was first introduced in Superman comics by Jerry Siegel in 1961 and has since appeared in other Superman-related media under different names. Smallville is the first appearance in which the character has been an intricate part of a Superman adaptation. Series developers Alfred Gough and Miles Millar created Lionel Luthor for Smallville to provide an antithesis to the parenting style of Jonathan Kent (John Schneider) and Martha Kent (Annette O'Toole). In the DC Comics, Lex Luthor's father was originally named Jules Luthor, but later was renamed Lionel Luthor some time after Smallville. He debuted in Superman's Girlfriend, Lois Lane #23 (February 1961) and was created by Jerry Siegel and Kurt Schaffenberger. During the story of Smallville, Lionel evolves from being a nemesis of Clark Kent (Tom Welling) who develops multiple schemes to uncover Clark's secrets, to becoming an ally who eventually dies to protect Clark's secret from his own son. Lionel has a strained relationship with Lex and regularly tries to test him. He attempts to develop a romantic relationship with Martha Kent following the death of Jonathan Kent, helping her advance toward the United States Senate. A parallel universe version of the character is later introduced in the show's final season, who serves as Clark and his allies' adversary and plays a pivotal role in bringing Lex back from his presumed death. Lionel's development from a main antagonist to an ally was difficult for the writers, who felt the character's arc failed to achieve the status they wanted. Although they continued with the story arc, Lionel returned to using deception to protect Clark rather than exploit him. He is characterized as a sinister character who tried hard to further his own ambitions. Lionel's relationship with his son has been likened to that of Harry Osborn and Norman Osborn from Spider-Man comics. Role in Smallville In 1989, Lionel visits Smallville