 Athena Mulvain (Jane Powell) has attorney Adam Shaw (Edmund Purdom) reeling, and she knows he will marry her because the stars say so. The same goes for her sister Minerva (Debbie Reynolds) and the idol of the bobby-soxers Johnny Nyle (Vic Damone.) But winning the girls also involves their weight-lifting grandfather (Louis Calhern), star-gazing grandmother (Evelyn Varden) and their five beautiful, gymnastic sisters (Virginia Gibson, Nancy Kilgas, Dolores Starr, Jane Fischer and Cecile Rogers.) Adam and Johnny accept the health diet of molasses and yogurt and try to please the rest of the physical culture family, but trouble looms when Adam humiliates Grandpa s "Mr. America" protege (Steve Reeves) in a fight.