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Furious at what she saw as a betrayal by the Turtles, Karai plotted her revenge against them, first attacking them on the psychic plane via Foot Mystics, and later coordinating and leading an assault against them at their lair, which she believed successful. This new Shredder "would retain the traditional iconic elements, but have a different treatment". With Ch'rell gone and dead in the eyes of the world, Karai took over the Foot as well as the mantle of the Shredder (in a deleted scene she even says that Karai "no longer exists", completely replaced by The Shredder) sometime after she and Dr. During this season, she lets her desire for revenge control her. In the fourth season, Karai is one of the three main antagonists (alongside Hun and Agent Bishop). Leonardo and the rest of the Turtles, however, remain unfazed both out of disgust for Karai's involvement and they did not know that she stabbed Leo by accident. Chaplin, Karai cried out to Leonardo: "This is not what I wanted!".
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Chaplin are also captured and sent back to Earth and placed in a prison. Despite her efforts, however, in the end, the Shredder was taken prisoner and exiled by the Utroms, while Karai and the young Foot Tech Division Head Dr. When Leonardo refused to let Shredder go, Karai fought alongside with Ch'rell and (unintentionally) accidentally stabbed Leonardo in the shoulder with his own sword, damaging his carapace, although she later prevented the Ch'rell from killing the Turtles while they were unconscious. As the Turtles were chasing Ch'rell, Karai tried to reason with Leonardo, pleading him to let her father leave. Karai managed to stay in the graces of both sides until the Turtles faced the Shredder again in the season's finale. her loyalty to Ch'rell – was the main thrust of her Season 3 storyline, as she was pulled from both directions to take a side during their various encounters, even working together with the Turtles at times.
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Karai's internal conflict – her loyalty to the Turtles as fellow Bushido-practitioners vs. Despite Leonardo's lack of resistance, she proved unwilling to kill him. Leonardo, Raphael, and Splinter were taken hostage during their encounter, and Karai was forced to fight Leonardo. Realizing that their agreement with the Foot had been recanted, the turtles decided to face the Foot again in their temporary HQ-a ship stationed at the docks. As his first order of business, he deployed a killer robot (disguised as Splinter) to eliminate the turtles. Karai and the Foot reappeared in Rogue in the House, Part 1, where a fully-healed Ch'rell retook control of the Foot. Her disappointment is one of many signs that she is the honorable person she says she is. However, she showed sadness when the Ch'rell vowed to get revenge on the Turtles after she had made a truce with them. However, the end of the story, it was revealed that Karai had been manipulating the Turtles (much to her dismay), and had been working with the not-dead Shredder all along. Together, Karai and the Turtles eventually retook control of the New York Foot and consequently its underworld. Raphael initially refused, although he later recanted. Leonardo, believing that Karai was honorable despite her legacy, convinced Donatello and Michelangelo to aid her.
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When the Purple Dragons, the Mafia, and the Foot were fighting for control of New York City after the Shredder's reported demise, Karai arrived in the city after hearing the news of the gang war taking place and quickly enlisted the aid of the Turtles to stop it, promising an end to the Foot’s vendetta against them in exchange for their assistance. Karai first appears as one of the highest-ranking members of the Foot Clan, similar in status to Hun (who holds a grudge against her for unknown reasons) eventually, she becomes the clan's leader. When the Utroms fled for New York, Karai remained in charge of the Japanese Foot Clan. An aspiring practitioner of Bushido, she became his most trusted follower, even trusted to his true identity as Ch'rell and told her that the Utroms were savagely hunting him (and in his mind they were). He took her in and raised her as his own, teaching her ninjutsu. As a child, Karai was found and adopted by evil alien Ch'rell after her parents abandoned her at a young age.