在一个阳光明媚的日子里，克林、小八戒、布玛、悟饭（野泽雅子 饰）相约去山里野营。夜深人静，一枚来自外太空的飞行器引发森林大火。克林和悟饭用气吹散大火，并集结七颗龙珠召唤神龙，将被火焚毁的森林恢复原状。悟饭还认识了新朋友快速龙。未过多久，新的敌人向地球逼近，他是与悟空长相极其相似的邪恶赛亚人达列斯。达列斯带着爪牙在宇宙中流浪，到处寻找适合种植神精树的星球。神精树的果实可以成倍提高一个人的战斗力，但这种树也会将该星球的生命力全部吸收耗尽。为了阻止达列斯的阴谋，拯救赖以生存的美丽地球，Z战士团结一致，迎战敌人…
In the year 2149, the world is dying. The planet is overdeveloped and overcrowded, with the majority of plant and animal life extinct. The future of mankind is in jeopardy, and its only hope for survival is in the distant past. An ordinary family goes on an extraordinary journey back in time to prehistoric Earth as a part of a massive expedition to save the human race.
