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As an infant girl, Jo miraculously survived a near-fatal airplane crash over the Amazon. After this traumatic experience, she was taken in and raised by wild wolves. As she grew and matured, Jo gained physical attributes that were three times greater than that of a normal human.
However, soon after her "mother's" death, she began to torment the neighboring villagers, at which point Jo was branded with the monkier "Man-Eating Wolf Girl." Her life took a turn for the worse when she was captured and subsequently imprisoned.
While imprisoned, Jo frequently became enraged, exhibiting her unconrollable power to supervising officers. As luck would have it, the Red Scorpion began to hear rumors of this "Man-Eating Wolf Girl." The Red Scorpion then took her from prision and unleased her on an unsuspecting world to seek out Ehrgeiz.