Alex Danvers (Chyler Leigh) is the loyal older sister of Kara Zor-El, also known as Supergirl. Alex could have easily felt stifled in the shadow of her superpowered sibling, but she's embraced her unique accomplishments and really come into her own as a fellow superhero. In early episodes of Supergirl, Alex's fitted black garb and holster belts evoked a Black Widow-esque vibe, but the character and costume have both evolved.

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