------银行小职员斯坦利（金•凯瑞 Jim Carrey 饰）老实本分，过着和所有老实人一样的平凡生活。一次，斯坦利在接待金发美女蒂娜（卡梅隆•迪亚茨 Cameron Diaz 饰）时深深恋上了对方，不料蒂娜却是黑帮头目多利安（彼得•格林纳 Peter Greene 饰）抢劫银行前派来打探地形的。多利安随后成功抢劫了斯坦利所在的银行。一晚，斯坦利意外获得了一个奇怪的面具。戴上面具后的斯坦利变得力大无比、身手敏捷。斯坦利开始四出捉弄平日欺负他的人，并抢走了多利安劫得的巨款，与蒂娜在夜总会尽情飞舞。多利安知道了面具的威力后，用计夺走了面具，斯坦利则被关进了监狱。斯坦利最后能否凭自己的智慧夺回面具，与蒂娜有情人终成眷属?

Jim Carrey was once the king of movie comedies, but he's been something of a recluse on the big screen over the last several years. His last string of starring roles came in 2013 and 2014 with the releases of "The Incredible Burt Wonderstone," "Kick-Ass 2," and "Dumb and Dumber To," all of which misfired with critics and struggled at the box office. Although he appeared in a supporting role in this year's "The Bad Batch," he was unrecognizable and rejected all press opportunities to support the film. The documentary finds Carrey hard at work in his art studio, and it features some truly jaw-dropping paintings made by the actor. Carrey picked up art six years ago as a way to "heal a broken heart," and it's produced some of his best work ever.
—Peter-Patrick76

查理（金•凯瑞 饰）是一名善良的巡警，他的妻子与别人偷情生下三个儿子后与情人私奔了。可是查理仍把三个儿子视为己出，儿子们也十分尊敬这个老爸。镇上的人们都欺负查理的善良，终于隐藏在查理体内的另一个狠角色——阿庆出现了。阿庆与查理截然不同，他到处捣乱，到处生事。
警方为查理检查，发现他患上了精神分裂，需要用药物治疗。这时查理要护送美女伊莲（芮妮•齐薇格 饰）回去纽约，可是伊莲的前老板狄克所做的不法事情被举报了，他认为举报者就是伊莲，于是狄克买通了警察等人，誓要杀死伊莲。
伊莲求助与查理，于是两人还有阿庆一起开展了一段亡命之旅。查理的药却丢在了旅馆里，于是一路上查理与阿庆毫无预兆的更换着，更复杂的是查理与阿庆都爱上了伊莲，查理与阿庆争风吃醋，争斗不断。而警察与狄克一直穷追不舍查理他们……