Sylvain Berg, a "professional" unemployed who spends his time hiking and mountain climbing, and "model" bank employee Benoît Constant, who has just been fired and does not want his wife to find out, both find themselves in Françoise Duru's office at an employment agency. Françoise is secretly in love with Sylvain, so in order to keep him close she convinces her employer to give Sylvain a job he doesn't want, instead of Benoit who not only wants it but also has the right qualifications.

Les Visiteurs is about the disappearance of a team of six extraterrestrials coming to study Earth. The Empire of the Four Planets dispatch two police detectives to find them. They slip into two human bodies just as they are about to die, those of a Frenchman Jean-Louis and a German woman Renate, and resuscitate them so as to pursue their mission.

A brash and precocious ten-year-old comes to Paris for a whirlwind weekend with her rakish uncle.