At the end of the recent episode of “Supergirl”, we saw the nefarious CADMUS “doctor” revealed as being the mother of Lena Luthor. In an interview with EW.com, executive producer Andrew Kreisberg further reveals that Lena’s (and presumably Lex’s) mother goes by the name of Lillian Luthor.
“That’s part of why we did it this way,” EP Andrew Kreisberg says. “You’re supposed to be left wondering how involved Lena is. We’ve seen that Lillian Luthor is somebody not to be messed with. She clearly wields a great deal of power and scientific knowhow. What exactly is her relationship with her daughter, and exactly how much Lena is involved with Cadmus, makes up part of the excitement factor for these next few episodes.”