Answer
Chyler Leigh plays the role of Alex Danvers in the television series Supergirl. Alex is the adoptive sister of Kara Danvers, who is secretly the superhero Supergirl. Alex is a skilled scientist and agent of the Department of Extranormal Operations (DEO), a government agency that deals with extraterrestrial threats. She is a strong, intelligent, and compassionate character who is fiercely loyal to her family and friends.