Ep. 12: The Star-Branded Dragonar

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The evil group complete their plan and force Eco into her dragon form. Eco is then possessed by the spirit who formally resided in Silvia's brother's body. Eco loses control of her body and wreaks havoc on the city. This causes Ash to jump into action. Venturing into Eco's mind, Ash fights and defeats the spirit, returning Eco to her human form and saving the city. (Source: Wikipedia)