Supergirl is DC Comics product, a female version of Superman.
One of the, if not the most important and recognizable character in DC Universe.
Kara (Kara Zol-El) was sent from planet Krypton to Earth in order to protect her infant cousin Kal El (Superman).
After her spacecraft got knocked in Phantom Zone, she was trapped there and couldn`t escape for 24 years.
TV show picks off from that point on, meanwhile, infant Kal-El, that she supposed to protect already became Superman.
Stunning visuals for a TV show, interesting characters and their development and connection to Superman universe makes this show worth watching