故事以Franklin和Irene York这对爱人为中心，他们多年前发现了一个掩埋在自家后院下的舱体密室，通过它可以去往一个陌生荒芜的星球。从此他们便小心守护着这个秘密，但当一个神秘的年轻男子进入他们的生活后，York一家平静的生活迅速被搅乱了，而他们自以为十分了解的神秘舱体密室，比想象中要复杂得多。

伯尼回来了，孩子们都很高兴。但他们的宿敌温斯顿也一样，他即将绑架这只天才海豚。凯文和霍莉必须在为时已晚之前救出他们那泼辣的朋友。　　The kids are thrilled that Bernie has come back. But so has their old enemy Winston, who's about to kidnap the talented dolphin. Kevin and Holly must rescue their splashy friend before it's too late.