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Buu's battle with himself within his own brain causes his body to mutate. Having been devoured by Buu, Goku and Vegeta must escape their enemy's body before the mutation process is complete. By the end of the story, the Earth faces a new and deadly threat in the form of the Evil Kid Buu. Although this episode marked the beginning of the "Kid Buu Saga", it was telecast in the United States as the final installment of DragonBall Z's sixth season.