A couple of pivotal casting descriptions have come out regarding the new Supergirl TV series, which CBS has given an official series commitment. Based on the characters from DC Comics, Supergirl will follow Kara Zor-El. Born on the planet Krypton, Kara escaped amid its destruction years ago. And since arriving on Earth, she’s been hiding the powers she shares with her famous cousin. Now TVLine.com has revealed some of the key casting details for both Kara Zor-El (aka Kara Danvers) and...Kara's foster sister Alexandra “Alex” Danvers. Continue reading…