Supergirl
CBS, Mondays, 8 p.m. CBS’s Supergirl is based on Superman’s cousin’s heroic adventures in Los Angeles-like National City. Avoiding the darkness of the DC heroes’ films, Supergirl, like The Flash, is bright and cheery, positive and inspiring. As Kara Danvers and Supergirl, the titular Kryptonian refugee who becomes super-powered under the Earth’s yellow sun, Melissa…