Supergirl

Supergirl is the 2015 TV series based on the DC character Kara Zor-El, Superman's cousin.

Though produced by the same producers of The Flash and Arrow the show was initially developed for CBS and filmed in Los Angeles. The network cancelled the show after one season but was immediately picked up by The CW, who saw it as an easy fit with it's growing DC Comics-based block. 

In spite of the network change, the show was still set on an Earth from a reality separate from the so-called Arrowverse. The Flash guest starred in season one but had to breach dimensional boundaries to do so. Once the show resumed on The CW network, Supergirl routinely crossed dimensional lines to join crossovers. In the 2020 event Crisis on Infinite Earths, Supergirl's reality was merged with that of the other shows once and or all.

Synopsis from The CW: When she was 12 years old, Kara Zor-El escaped the doomed planet Krypton and was sent to Earth where she was protected and raised by her foster parents, Jeremiah (Dean Cain) and Eliza Danvers (Helen Slater) and her foster sister, Alex (Chyler Leigh). Under their supervision, Kara learned to conceal the phenomenal powers she shares with her famous cousin, Superman (Tyler Hoechlin), in order to keep her identity a secret.

Years later, Kara was living a “normal” life in National City, assisting media mogul and fierce taskmaster Cat Grant (Calista Flockhart) and working with her famous friend, and now Editor-in-Chief of CatCo, James Olsen (Mehcad Brooks). When Alex’s life was threatened in a plane crash, Kara took to the sky to rescue her. In the aftermath, Kara decided she could no longer sit on the sidelines and came out as Supergirl. She now balances her job as a reporter at CatCo Worldwide Media with her work at the Department of Extra-Normal Operations (DEO), a super-secret government agency, which is run by her sister Alex. Supergirl also gets help from her friends J’onn J’onzz aka The Martian Manhunter (David Harewood), Brainiac-5 (Jesse Rath), Nia Nal aka Dreamer (Nicole Maines) and Lena Luthor (Katie McGrath).

Based on characters from DC created by Jerry Siegel and Joe Shuster, Supergirl is from Berlanti Productions in association with Warner Bros. Television, with executive producers Greg Berlanti, Sarah Schechter, Robert Rovner and Jessica Queller.