Xaver is a rural rube who comes across a disabled spaceship in this light comedy. Alois is the alien who is befriended by Xaver and his busty sweetheart. Alois is disguised as just another Alpine tourist as the three search for a fuel pump to fix the engine of the spacecraft.

Thierry drops out of school to apprentice as a lion tamer at the zoo where he meets Roselyne, who shares his passion. They fall in love and when he loses his job, the young lovers journey across France finding odd jobs at several circuses. In Germany, they fall under the tutelage of ageing big cat trainer, Klint, and while they are closer to realising their dreams, they find that their success drivers them part.