A second development for the show was the relationship between Lionel and Martha Kent. As part of season two was about expanding the lives of the adults away from Clark, "Nocturne" saw the beginning of the Lionel/Martha relationship. This relationship allowed for more situations of Schneider and O'Toole doing scenes together that were not about the kids. By the end of the season, each of the main characters reach turning points in their lives. Welling also commented on his character's development over the course of the season, specifically on Clark meeting his biological father and how that affects his life: "To have two very strong father figures telling you different things is a lot to handle, and Clark has to take this information, put it to the test and come to his own conclusion, and it’s not an easy one."