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.

Pierre Richardas Matthias Duval / Mathieu Duval
Camilla Moreas Elisabeth 'Betty' Kerner
Carey Moreas Elizabeth 'Liz' Kerner
Jean-Pierre Kalfonas Ernest Volpinex
Andréa Ferréolas Evie
Jacques Frantzas Ralph
Jean-Pierre Castaldias Charlie
Paul Le Personas le clochard jazz
Jean-Claude Bouillaudas l’inspecteur
Henri Labussièreas le maire
Robert Fraisse