Paul Blart is a mild-mannered, dutiful family man who works as a security guard in a New Jersey mall. He has applied to become a cop for years, but he always fails the physical exam because he is overweight. One day, a gang of organized criminals put the mall under siege and take hostages. Blart becomes trapped inside and because he feels that it is his duty, refuses to leave. He becomes the police department's eyes on the inside and attempts to stop the criminals on his own.