一度平静的斯沃罗夫小岛被弗林德·洛克伍德（比尔·哈德 Bill Hader 配音）的天才发明复食机所摧毁。最终他成功破坏复食机，并打算和山姆（安娜·法瑞丝 Anna Faris 配音）他们重建美好家园。这时候，弗林德最崇拜的偶像——丽芙公司老板切斯特 V（威尔·福特 Will Forte 配音）从天而降。切斯特是一个天才发明家，他的公司更是云集了全世界顶尖的科学家。切斯特邀请弗林德加入丽芙公司，并承诺带着岛民前往加利福尼亚，而他的公司将负责清理破败的小岛。为了成为幻想发明家，弗林德拼尽全力开展研发。与此同时，故乡却传来不好的消息。许多清理者被活着的食物所捕获，似乎复食机并未完全摧毁，并且朝着弗林德不曾预料的方向继续发展。在切斯特的命令下，他和山姆、老爹以及其他伙伴们踏上了返乡的旅途，寻找解决麻烦的办法……
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