Nigel Marven and his two-man crew shrink themselves to a half an inch tall and explore the small world of bugs. Little do they know, these are like monsters at their miniaturised state. As they venture through the back yard, they encounter many species of bugs and even a frog the size of a dinosaur (from Nigel's point of view). After going through Spider Valley, they learn of the extreme side effects of being miniaturised, and must survive and make it back to their car in twenty-three hours, or remain small for the rest of their short lives. In the climax, it's all up to his assistant Laura to save him.