Zoid是生活在银河系中并且愿意战斗的金属生物。

地球已尽头，人类将地球作为第二故乡，但由于Zoid因素的失控和意外的时间扭曲，Zoid突然出现在21世纪的地球上。地球曾经因Zoids的破坏和反复的地壳运动而被破坏。

里奥（Leo）和莎莉（Sally）一起冒险之旅，她是一个影响着地球未来的女孩，她发现了自己的野兽装备。

　　「洛伊德」被評為擁有金屬身軀、動物本能的最強機械生命體。是先古時代留下來的高科技遺產，具有遠古猛獸的外形和復雜的生物機能的鋼鐵戰士。牠們活躍的時代是處於生態系頂點，部份人類將牠們的骨骸從地底挖掘並復原。當人類與「洛伊德」能夠人機融為一體時，「洛伊德」便可以使出「本能解放」的特別能力，進而施展必殺技。

　　邪惡的死亡金屬帝國挖掘並控制了大部分的索斯機獸，企圖稱霸地球。少年嵐和他的索斯機獸搭檔「狂野白獅」在尋找「古大秘寶 Z」的過程中，與同樣充滿正義感的個性迥異的小夥伴們相遇相知，一起組成強大的團隊與邪惡的死亡金屬帝國鬥爭！

In the 21st century planet Earth was rendered inhospitable to life, and people mass-migrated to Planet Zi, the natural home of metallic life forms known as Zoids. Many years later, Zi faces its end. Its inhabitants partake the journey to migrate back to Earth. Attempting to regenerate the Earth to make it hospitable, the migrants come up with a "Zi-Forming" scheme. However, the plan fails and Earth is left in its state of turmoil. Overrun by Zoids and blanked by unstable weather phenomena, the migrants are faced with a difficult life. The Empire and Republic settlements attempt to uncover Zoids buried within the Earth to bolster their respective armies. The story picks up following second-generation Earth citizens: Leo Conrad and Buzz Cunningham, who have a chance encounter with a girl Sally Land as she flees the clutches of the Empire.

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