第 4 集: RD在Savage Hammer的挑戰下發現Fire Phoenix成為Zero的合體夥伴

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RD figures out that the ZOIDS which is able to combine with "Zero" is "Fire Phoenix", and is in the testing process. At that time, "Mach Storm" receives a challenge for a ZOIDS battle from "Savage Hammer." (Source: Zoids Wiki)