Benjamin (Jean Tissier) is the irresponsible patriarch of a fun-loving Roman family. Ostensibly the owner of a drug store, Benjamin would much rather rummage through ruins in search of ancient Roman artifacts. While searching for a valuable statue of the great God Jupiter, our hero must contend with his status-seeking wife (Huguette Duflos), who intends to marry off her daughter (Dany Robin) to a wealthy distant cousin. The comic complications come thick and fast when a genial escaped lunatic named Jupiter (Georges Marchal) shows up, and is immediately mistaken for the much-anticipated cousin. Jupiter is a faithful adaptation of a stage play by Robert Bolsey. ~ Hal Erickson, Rovi