Robert Voets/Warner Bros. Entertainment Inc.
Alex Danvers
Played by Chyler Leigh
Much of Supergirl’s heart comes from the bond between Kara and her adoptive sis (a new, non-DC character), which the Grey’s Anatomy alum feels “is honest” in its portrayal of often-fraught family ties. “I think Alex had this innate jealousy, a feeling that whatever she was doing, she had to be better at it.”