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Kara Zor-El is the last survivor of Argo City, which had survived the explosion of the planet Krypton and drifted through space. The storyline in the first arc of Supergirl depicts a darker, evil version of Kara emerging when Lex Luthor exposes her to Black Kryptonite. The evil Supergirl implies that Kara's family sent her to Earth to kill Kal-El as revenge for a family grudge; at the time, Kara herself refuses to believe this, but later flashbacks indicate that not only is this partly true, but Kara had been physically altered by her father as a child before being involved in several murders on Krypton. This was later revealed to be delusions as a result of kryptonite poisoning. Upon being cured she adopted a personality more like that of her golden age persona.