The CW has released the first trailer for the season 2 finale of Supergirl from the episode entitled Nevertheless, She Persisted: “Supergirl challenges Rhea (guest star Teri Hatcher) to battle to save National City. Meanwhile, Superman (guest star Tyler Hoechlin) returns and Cat Grant (guest star Calista Flockhart) offers Supergirl some sage advice.” https://www.youtube.com/watch?v=XKh0lDJkgho