Supergirl (Kara Zor-El) in the context of "Supergirl (1984 film)"

Krypton is a fictional planet appearing in American comic books published by DC Comics, most commonly appearing or mentioned in stories starring the superhero Superman as the world from which he came. The planet was created by Jerry Siegel and Joe Shuster, and was named after the chemical element krypton. It was first mentioned in Action Comics #1 (June 1938) and made its first appearance in Superman #1 (June 1939). Krypton is destroyed immediately after Superman, as the baby Kal-El, is sent from the planet in a spacecraft by his parents, although the exact details of its destruction have varied over publication history.

The planet is portrayed as having been far more technologically advanced than Earth, and having orbited a red sun. Kryptonians were the dominant species on Krypton, and its inhabitants included Kara Zor-El, Krypto, Beppo, Kara Zor-L (in her case, an alternate-universe version designated "Krypton-Two"), and the supervillain General Zod.

Power Girl, also known as Kara Zor-L, Karen Starr, and Paige Stetler, is a superheroine appearing in American comic books by DC Comics, making her first appearance in All Star Comics #58 (January/February 1976). Power Girl is the cousin of the superhero Superman, but from an alternate universe in the fictional multiverse in which DC Comics stories are set. Originally hailing from the world of Earth-Two, first envisioned as the home of DC's wartime heroes as published in 1940s comic books, Power Girl becomes stranded in the main universe where DC stories are set, and becomes acquainted with that world's Superman and her own counterpart, Supergirl.

In common with Supergirl's origin story, she is the daughter of Superman's aunt and uncle and a native of the planet Krypton. The infant Power Girl's parents enabled her to escape the destruction of her home planet by placing her in a rocket ship. Although she left the planet at the same time that Superman did, her ship took much longer to reach Earth-Two. On Earth, as with other Kryptonians, Power Girl discovered she possessed abilities like super strength, flight, and heat vision, using which she became a protector of innocents and a hero for humanity. Though the specifics of how vary over subsequent retellings, Power Girl is later stranded on another Earth when a cosmic crisis affects her home of Earth-Two, and later carves out a separate identity for herself from her dimensional counterpart Supergirl once they are forced to coexist.

Supergirl is an American superhero drama television series developed by Ali Adler, Greg Berlanti and Andrew Kreisberg that aired on CBS from October 26, 2015 to April 8, 2016, and later The CW from October 10, 2016 to November 9, 2021. Based on the DC Comics character created by Otto Binder and Al Plastino, the series follows Kara Zor-El (played by Melissa Benoist), Superman's cousin, and one of the last surviving Kryptonians from the planet Krypton. As Supergirl, Kara uses her powers to protect National City. The series was retroactively incorporated into the Arrowverse beginning with its second season, and became definitively linked with the rest of the franchise in the fifth season.

The series was officially picked up on May 6, 2015, after receiving a full series commitment in September 2014. Following a full season order on November 30, 2015, it transitioned to The CW for its second season going forward.

Alfred John Plastino (December 15, 1921 – November 25, 2013) was an American comics artist best known as one of the most prolific Superman artists of the 1950s, along with his DC Comics colleague Wayne Boring. Plastino also worked as a comics writer, editor, letterer, and colorist.

With writer Otto Binder, he co-created the DC characters Supergirl and Brainiac, as well as the teenage team the Legion of Super-Heroes.