Know Thine Enemy (1) Superboy : Season 4 Episode 7

Lex Luthor has plans to bring about the end of the world by detonating a network of ""dirty bombs"" that will wipe out the population with a cloud of radiation. And he has a plan to get Superboy out of the way as well. Superboy is drawn to an old lair of Luthor's by a hypersonic signal. There he finds Lana has followed him and they discover a computer program, created by Luthor, known as a ""psycho-disc"". The program allows the user to live out Luthor's life in a virtual reality type environment. Superboy activates the program and becomes Luthor in the VR world. He sees how Luthor lived with an abusive father, and a mother who refused to stand up for herself. The only person Luthor ever loved was his sister Lena. Meanwhile, back in the real world, Lana learns that if Superboy is not removed from the VR world soon, he will be trapped in a never ending loop of Luthor's memories. Lana becomes a part of the program herself, hoping to rescue Superboy.