两年前阴差阳错之下，三只花栗鼠艾尔文（贾斯汀·朗配音）、西蒙（马修·格雷·库伯勒配音）与西奥多（杰西·麦卡尼配 音）成功帮助一个事业失败的作曲家戴夫·塞维利亚（杰森·李饰）重新振作起来。如今光阴似箭，三个可爱的家伙已经彻底适应 了人类社会，和戴夫的相处也算是愉快，当然花栗鼠们也没忘记间或捉弄戴夫……如今的戴夫已经是一位知名作曲家，而他的生活 也开始忙碌起来，甚至没空管管自己的侄子托比（扎克瑞·莱维饰）的生活。
托比最近遇到了一个麻烦事，他所在的校园举办了一个音乐比赛，而他因为某个原因，必须要赢得比赛的25000美元奖金。为 了让自己能够赢得比赛，他向叔叔戴夫求助，不过忙得要死的戴夫实在分身乏术，因此这个重任就落在了三只花栗鼠身上。艾尔文 、西蒙和西奥多开始过起了校园生活，而他们在校园里也遇见了另外三只同样热爱音乐的女花栗鼠--布列塔妮（克里斯蒂娜·艾伯 盖特配音）、埃莉诺（艾米·波勒配音）与珍妮特（安娜·法瑞丝饰）。浪漫的火花一触即燃…
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