Supergirl's Katie McGrath Explains Why Lena Is So Guilt-Stricken Over Kara And confirms Lena is done with LuthorCorp Jolie Lash Supergirl's Lena Luthor has had a lot on her plate. Katie McGrath's Arrowverse character remains wracked with guilt and self-blame since her brother, Lex Luthor (Jon Cryer), sent Kara Zor-El (Melissa Benoist) on a one-way portal ticket to the fractured Phantom Zone in the Season 6 premiere. She also failed in her quest to help National City's district attorney's office bring her brother down by giving testimony against him. Then, there was the whole children's hospital donation that went awry when Lex had his thugs set fire to the medical facility.