Lana Lang (Krisitn Kreuk) was introduced since the pilot of Smallville as a potential love interest for Clark Kent. During the first season she's dating Whitney Fordman, but by season two she and Clark grow closer. He eventually pushes her into the arms of Lex Luthor by hiding secrets about his true identity. However, the soon rekindle things just before Lana is set to marry Lex. Eventually, Lana realizes the only way for Clark to be the best superhero would be if she left Smallville. She left the show as a series regular.