龙（王力宏 配音）的神秘消失让天庭陷入了混乱之中， 玉帝下达了最后的通缉令，如果众生肖无法在三日之内寻得龙的踪迹，那么生肖就要重新选举，这也就意味着全人类的性格将会因此而发生翻天覆地的变化，这将无异于一场充满了毁灭性的浩劫。而造成这一切的罪魁祸首，是正在筹划一个惊天阴谋的蟑螂。鼠老大、老马哥、猪仔和羊妹踏上了寻龙之旅，它们得知唯一的线索掌握在一位名叫小珍的人类小女孩手中，便前去找她。小珍亦有着自己的烦恼，她的家庭正在濒临破碎的边缘，这是小珍最不愿意看到也最无法接受的。肩负着双重使命，小珍和众生肖一同踏上了冒险之旅。
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