1. Supergirl Monday, 8 p.m., CBS Melissa Benoist has a hit on her hands. Her new series, “Supergirl,” premiered to big numbers Oct. 26 on CBS, and has continued to draw viewers. Benoist, who played Marley Rose on “Glee,” stars on “Supergirl” as Kara Danvers, who toils by day as the harried assistant to high-powered...