An AI made from a copy of the mind of the infant Lena Luthor, Lex Luthor‘s daughter, that was created when Brainiac 13 traded his B13 technology that had advanced Metropolis to that of the technological level of the 64th century to Lex Luthor in exchange for the body of Lena Luthor. When Brainiac 13 left and was no longer controlling the advanced technology himself, he left behind a AI copy of Lena Luthor’s mind to maintain and control the B13 technology. The AI believed herself to be the real Lena Luthor for years and disliked Lex Luthor for his mistreatment of her.
In the Superman: Metropolis maxiseries the AI Lena became focused on finding a purpose for herself outside of controlling the B13 technology and took control of Jimmy Olsen‘s signal watch and fused it to his body so he couldn’t remove it. She created intense situations for people in Metropolis to live through so that she could experience what they experienced, and had Jimmy as a part of many of them.
Lena then made herself a human body and abandoned the B13 technology in order to pursue a romantic relationship with Jimmy Olsen, causing Superman to bring the real infant Lena Luthor to the AI to convince her that she wasn’t the real human Lena Luthor with the intention of getting her to take control of the technology again, which in her absence had stopped working and brought Metropolis to a dangerous stand-still.
Ultimately, Metropolis was downgraded to the technological level of the modern century and the AI Lena was able to safely remain in a human form.