The Marx Brothers help young Broadway hopefuls when they get mixed up with gangsters due to a tin of sardines containing Romanoff diamonds.

Ole Olsen and Chic Johnson are Broadway stars who return to Universal Studios to make another movie. The mere mention of Olsen and Johnson's names evacuates the studio and terrorizes the management and personnel. Undaunted, the comedians hire an assistant director and unknown talent, and set out to make their own movie.

Two bumbling plumbers are hired by a socialite to fix a leak. A case of mistaken identity gets the pair an invitation to a fancy party and an entree into high society. As expected, things don't go too smoothly.

Connie Ward is in seventh heaven when Gene Morrison's band rolls into town. She is swept off her feet by trumpeter Bill Abbot. After marrying him, she joins the band's tour and learns about life as an orchestra wife, weathering the catty attacks of the other band wives.

The president of a settlement-house group puts on a benefit variety show.