A scientist is conducting experiments with a machine that can shrink objects. To play it safe, he decides to carry out the tests a little way from home—but makes the mistake of bringing his dog along.

The Corgi accidentally pulls the lever and shrinks down to the size of an insect. Thus begins an epic journey back home, as he battles through huge challenges, enemies, and bosses along the way—including spiders, ants, rats, bees...