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.
Supergirl's classic costume was designed with a blue top, red skirt, cape, and the iconic 'S' shield emblem, setting a visual precedent for the character.
During the 1985-86 Crisis on Infinite Earths series, Supergirl was killed off in the comics to consolidate the multiverse and reboot continuity.
Following Crisis, Supergirl was reintroduced as Linda Danvers, a human merged with an angelic entity, marking a major shift in character portrayal.
A Supergirl TV pilot starring Helen Slater aired in 1984, marking the character's first major live-action adaptation attempt.
Supergirl appeared in various animated series such as 'Justice League' and 'Justice League Unlimited', increasing her presence in popular media.
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.
In the TV series, Supergirl's costume underwent design changes to appeal to modern audiences with a more armored look and darker colors.
Kara Zor-El is born on the planet Krypton, into the House of El.
The planet Krypton explodes, leading to the death of most Kryptonians. Kara's spacecraft is sent to Earth but arrives years after her cousin Kal-El.
Kara Zor-El arrives on Earth and is found by the Danvers family, who take her in and give her the name Kara Danvers.
Kara begins to manifest and develop her superhuman powers under Earth's yellow sun, including super strength, flight, and heat vision.
Kara decides to use her powers to protect humanity and adopts the superhero identity of Supergirl.
Kara begins working with the Department of Extra-Normal Operations (DEO) to fight extraterrestrial threats.
Supergirl faces off against Lex Luthor, who seeks to exploit alien technology for his own gain.
Supergirl confronts Reign, a powerful Kryptonian Worldkiller threatening Earth.
Supergirl teams up with her cousin Kal-El to save the Earth from a catastrophic alien invasion.
