Matthias Duval is in love, but he can't choose between the two twin sisters Betty and Liz Kerner. To pick up the two sisters, he invents his own twin brother and will play both characters.

• Les Productions de la Guéville
• Fideline Films
• Pierre Richard
• Camilla More
• Carey More
• Jean-Pierre Kalfon
• Andréa Ferréol
• Jacques Frantz
• Jean-Pierre Castaldi
• Paul Le Person