Robert and Françoise Monier make a hot air balloon to fly to the stratosphere. After a visit to Venus, they return home, but have only aged 15 days whereas 25 years have passed on Earth.
Françoise Monier, aeronaut
Robert Monier, Françoise's husband
Lucien Marchand, laboratory boy
First smooth-talker
Banker Antoine
Béatrice
Director
Marie
Pépin
Gaby
