Synopsis: The Earth shakes violently. The tremors are caused by the undersea Mu Empire,a belligerent dominion seeking to reclaim their rule above sea level. The Muans are aided and protected in their crusade by their God Manda, a gigantic sea serpent dragon.
But all hopes rest on Captain Jinguji (Jun Tazaki) and his super submarine Atragonito stop the Muans - yet the captain has no interest in committing his submarine to battle against the Mu Empire. That is, until the Muans kidnap his daughter. Now the Atragon, equipped withia high-powered freeze ray and the capability of flight, must face the apocalyptic weapons of the Mu Empire to save humanity!
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