Meet Walter Maninko. He's unsuccessful. Never made anything of himself. Hates his job. And definitely never got the girl. But maybe his luck is about to change. In town to handle his family estate, Walter finds himself hoping to turn things around. And a great place to start would be with his high school sweetheart. That is to assume she's still single all these years later. Doubtful. But that's the least of his worries, as Walter and his friends are interrupted by a monstrous surprise. The small town of Seward, Alaska is suddenly overrun by giant Alaskan king crabs. Where did they come from and how the hell did they get so big? People are dying left and right. Will Walter turn things around, make something of himself, and finally get the girl, or will he fall short like he's always managed to do, and die like everyone else?