CW | 9:00 pm

Lena Luthor (Katie McGrath) ponders how far she is prepared to go to stop her brother, Lex (Jon Cryer), as the stakes involving this arch-villain continue to rise in the new episode "A Few Good Women." Meanwhile, Supergirl (Melissa Benoist) and her team face an unprecedented challenge, one that forces Alex (Chyler Leigh) to her breaking point. Jesse Rath also stars.