Dressed in a white suit, Dave (Eddie Murphy Eddie Murphy) looks like a polite middle-aged man. Although he always seems out of place in this era and this metropolis in modern New York, who would have thought that this very real-looking "man" is actually a humanoid spaceship with many 1/4-inch-tall alien villains who come to Earth to find ways to save their own planet? Unexpectedly, after a great test of adapting the spaceship to life on earth, who would have thought that the spaceship had fallen in love with a beautiful earth woman Genna (Elizabeth Banks Elizabeth Banks), and it was more and more difficult to adjust the course of the alien people.