某日突然现身于静冈的异星文明"Gaizok(ガイゾック)".开始侵略地球的行动.在数百年前逃避追杀而来到地球的神氏家族的后裔们,决意守护这个第二故乡.发动先祖遗留下来的巨大宇宙船"帝皇比亚路(キングビアル)"以及巨大合体机械人"赞波3(ザンボット3)",展开连番恶斗. 然而,神氏家族的付出却被百姓们所厌恶,认为他们就是招来Gaizok的元凶而遭到迫害.尽管被不信任,被出卖,被排挤,胜平一家还是坚持自己的立场,保卫地球......When alien invaders come to Earth, the Jin family reveals its alien nature. Their ancestors came to Earth from planet Biar, after it was conquered by the army of Gaizok, who is now aiming at conquering Earth. With the help of ancient documents they will find the ships of their ancestors and assemble the robot "Zambot 3", to fight their old enemy.
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