ALEX DANVERS: Kara’s gorgeous, brilliant, science-minded foster sister who is 26 years old. Growing up, Alex was partly jealous of her sibling yet also fascinated by her abilities, prompting Alex to learn as much as she could about alien anthropology, sociology and culture. Today, Alex works for a secret government organization and, alongside her heroic sister. One night Kara took Alex flying, where the D.E.O. found out about her and forced Alex's father to work for them instead of taking Kara away. One year later her father died protecting an alien, a martian, from Hank Henshaw. Alex is played by Chyler Leigh.

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