Kara Klones Kause Krisis

Linda Danvers II was the product of a genetic experiment, spawned by an adversary of the Earth-One Supergirl in order to make six miniaturized clones of the heroine. After battling them, Supergirl used Gold Kryptonite to drain them of their superhuman abilities, and kept them in stasis. However, the mental bond that existed between them allowed them to merge into one unified individual.

Karen Starr II was in actuality the original Kara Zor-L, who rather than being cloned into a new life form from cells of the original, was kept alive and youthful as her cells replicated continually for decades. During these forty years in outerspace, another Kara was spawned within the Symbioship's fabricated artificial reality which replicated Krypton-Two's Kandor-Two including her parents. Once Kara arrived on Earth-Two and reunited with her cousin Kal-L aka Superman, the duplicate Kara within her mind was erased from existence while her body began to age normally once more.

For a brief period of time, “Linda Danvers” used her mental abilities to cloud the memories of Supergirl, causing the Girl of Steel to forget her alter ego as Linda Lee Danvers. This was with the intent that the clone could live out Linda’s life in peace, while Supergurl carried on her costumed career full time. However, Kara Zor-El regained her senses and pieced together fragments of memories until she deduced who was the culprit behind her temporary amnesia. Once she confronted her with the truth, Supergirl proposed to “Linda” that both women could live out their lives independent of one another.

Due to the protective radiation generated by her three comrades when traveling back to Earth-Two from Earth-Prime, they along with Power Girl became temporal clones of earlier versions themselves. Younger versions of Green Lantern, Doctor Fate and Starman* were operating as costumed crusaders in 1942. Meanwhile, Power Girl’s earlier version of herself was rocketing through space while residing for decades within the life-sustaining vessel known as the Symbioship.

Of course, there were other versions of Kara Zor-El and Kara Zor-L. Their counterpart of Earth-Three, raised in the Kandor of Krypton-One, became Supergirl's arch-enemy Lesla Lar. The Kara Zor-L of post-Crisis Earth-0 merged her mind with a warrior princess in the notional reality version of Asgard, located high above Earth-Two. 

Then, there were the Kara’s’ dream doppelgängers:  Satan Girl aka Nightflame of the Innerverse dream reality within Supergirl’s mind, and the Power Girl from Earth-Two's future was journeyed to 1942 as well as the Power Girl who split from her during the Crisis on Infinite Earths.

* The Earth-One versions of the Earth-Two'sGreen Lantern, Starman and Doctor Fate’stemporal clones were two ofT.O. Morrow'sGreen Lantern temporal clones (his third Green Lantern mirrored the Earth-Two Conqueror’s Green Lantern clone) and his T.O. Morrow clone. As for the Huntress, Justice Leaguers and Crime Syndicators…  they were not alive in 1942, and would not have had temporal clones.