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The Cold War has ended, and the Russian government has decided get rid of a deadly bioweapon sample by returning it to the United States, from whom it had been stolen. Officer Hendricks has been assigned to pick up the virus sample and escort it back to America via submarine. Along the way, however, a gang of terrorists hijack the sub in an attempt to launch a bioweapon attack ...。大卫的爷爷在过81岁生日时许下了一个心愿，愿自己能重返18岁。一次，爷孙俩在车上嬉戏出了车祸，结果爷孙俩的年龄互换了，老人成了大卫，并到大学里重新体验了年轻人的生活。。