Supergirl was created by writer Otto Binder and artist Al Plastino, making her first appearance in Action Comics #252.
The identity of Supergirl as Kryptonian Kara Zor-El, Superman's cousin, was established in comics to define her origins and connection to Superman.
DC Comics' New 52 reboot in 2011 reintroduced Supergirl with a new origin and costume, revitalizing the character for a new generation.
A new daily TV series starring Melissa Benoist as Kara Zor-El debuted on The CW, significantly raising the character's profile.