A mad scientist grandfather invents a genetic transformation machine and his 4 year old grandson accidentally turns his body into that of a 30 year old man. Baby Bobby escapes and runs around town as his siblings try to catch him before their parents get back from vacation AND before the bad guys get to him first. The machine is worth a lot of money and they only have a day before the machine loses its capabilities to change baby bobby back.

博物馆新展出的文物--青铜古剑，遭到了各方势力的垂涎，国际女盗萝拉受雇神秘买家而来，初次进城的笨贼兄弟李风和刘黄却阴差阳错辅助萝拉得手宝物，但是交易途中宝物落入心狠老练的黑帮老大茂哥手中，萝拉布局“美人计”夺回宝剑却惹怒茂哥，于是暗藏黑心的茂哥手下黑子派笨贼兄弟追拿萝拉和宝剑，在前有黑帮势力的堵截，后有警察追踪的一路上，各方势力展开了明争暗斗的较量，神秘买家到底是谁？最终宝剑又会落入谁手？

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A mad scientist grandfather invents a genetic transformation machine and his 4 year old grandson accidentally turns his body into that of a 30 year old man. Baby Bobby escapes and runs around town as his siblings try to catch him before their parents get back from vacation AND before the bad guys get to him first. The machine is worth a lot of money and they only have a day before the machine loses its capabilities to change baby bobby back.