第4話: RD、サベッジ・ハンマーの挑戦の中でゼロの合体パートナーとしてファイアー・フェニックスを発見する

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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)