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sonic x episode 77
In the world of Sonic X, Cosmo was a member of the Metarex, an evil organization that sought to conquer the universe. However, she soon realized the error of her ways and defected from the Metarex, joining forces with Sonic and his friends. Cosmo's transformation into a powerful dark oak tree was a result of her exposure to the Metarex's dark energy, but it also gave her incredible strength and the ability to control plants.