It is after Clark saves his life that the two bond and become friends. "Smallville" plays on his relationship with Clark and how that deteriorates into the mutual enmity that they will have in life. Lionel exhibits many of the same characteristics as Lex's comic-book counterpart, and it is through Lionel's dysfunctional relationship with Lex that "Smallville" attempts to characterize how Lex eventually succumbs to his evil leanings; early seasons focused on Lex's traumatic and love-starved upbringing, a bleak contrast to Clark's idyllic childhood. His mother Lillian Luthor's death occurs when he was a child. In season 2, Lex is shown with a brother, Lucas Luthor, but Lucas was left to live on the streets as part of Lionel's attempt at a "nature versus nurture" test to see how a Luthor coped on his own. Season 3 Revealed he had a younger brother, Julian Luthor, who also died when Lex was young (but it is later revealed that the infant was smothered by Lillian in the throes of postpartum psychosis and the hostility between Lex and Lionel being caused because Lex claimed responsibility as his father might have killed his mother but would not hurt Lionel's only remaining heir) though a clone of his brother appeared in season 7 under the name Grant Gabriel. In season 5, Lex breaks all ties to his friends, including Clark. As resentment between the former friends grows - made even worse after Lex imprisons A.C. for attempting to stop an underwater weapon that was damaging the environment - Lex further alienates Clark by becoming romantically involved with Lana Lang after Clark breaks up with Lana following the death of Jonathan Kent. In season 5's finale, Brainiac (Milton Fine) manipulates Lex into being possessed by General Zod's consciousness. After recovery at the beginning of season 6, Lex focuses on his secret project 33.1 based around capturing and studying people who have been infected by kryptonite in order to recreate their abilities, ostensibly to protect the world against further alien threats, stating on some occasions that he feels anyone with such powers will naturally attempt to put themselves above the rest of humanity. This puts him at odds with Clark and billionaire vigilante Oliver Queen with whom he went to boarding school. At the same time, Lex becomes engaged to Lana after Lana is supposedly pregnant with his child (it turned out that Lana was drugged with a synthetic hormone to simulate pregnancy). They get married late in season 6. In season 6's finale, Lex is arrested for Lana's murder in an explosion triggered by a car bomb.