在太古時代，來自宇宙的神秘能源蓋塔射線突然降臨地球，導致地面上絕大多數恐龍滅絕，剩餘的逃入地底進化為恐龍人類；早乙女研究所把這未知的能源視為人類新的希望加以開發。但也因為如此，畏懼蓋塔射線的恐龍帝國把早乙女研究所視為必除的眼中釘。為了保住蓋塔射線也只有與恐龍帝國交戰了。於是早乙女博士研發了以爬蟲人類的弱點——以蓋塔射線作為動力源的超級機器人。但也因動力過於強大根本沒人可以駕駛。後來他發現了在全國空手道大會大鬧一場的空手道家的流龍馬、企圖引發革命來霸佔學園的學生運動家神隼人，藉以對抗恐龍帝國；在經歷幾度的交戰之後柔道家——巴武藏也志願成為蓋塔的第三位駕駛員，無止盡的防衛戰就此揭開……。
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