The Supergirl of the 853rd Century was an indestructible, unstoppable, cheerful little girl, who didn't understand the consequences of her actions until an alien named Dura reluctantly agreed to be her mentor.
Ariella Kent was the daughter of Linda Danvers of New Earth, who had tried to take the place of the Earth-One Supergirl and in doing so accidentally created a split timeline where Superman fell in love with her. The two married and Ariella was their daughter.
When The Spectre came to send Linda back to her own parallel reality, Linda agreed on the condition that Ariella would be spared. The Spectre agreed to her terms, and Ariella was left alone to wander the universe.
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