Herman and Pat, college youths, are employed after hours in a food market but are fired by the owner. The latter has an old maid sister who has been trying to marry her brother's business rival for years, while Herman is in love with the market owner's daughter, but forbidden to see her. They devise a grandiose plan to solve both problems.

Herman and Pat attend a dance at a co-ed school, with Pat dressing as a girl to become Herman's partner in an effort to avoid two homely girls forced upon them by the dean of women. Herman had been counting on his girl to save him but she hasn't arrived. When she does arrive, Herman is in trouble trying to explain his "date," Pat as a girl.

Pals Herman and Pat, with diamond rings in hand, are all set to make marriage proposals. Pat is bashful, however, so Herman broaches the subject to Pat's girl. The girl's parents think Herman is the suitor, and invite him to dinner. Meanwhile, Herman's own prospective in-laws are hosting a dinner, too, so Herman and Pat dash from one dining room to the other, trying to straighten things out.

When Pat gets married, he receives a raise from his boss. Herman, seeing how simple it is, tells his boss that he's recently married. All goes well until both bosses drop in on both young men to "meet the bride." Pat's bride finds herself playing both wives.

Pat wants to marry Nancy, but her mother refuses. Pat gets Herman to pose as Nancy's new suitor, expecting that he will be refused in favor of Pat. But mother tricks them by welcoming Herman into the family, and Pat has to do some quick thinking to get Herman off the hook.

A miniature vaudeville show, complete with a title card introducing each act, is presented. First up is The On-Wah Troupe, an East Asian group of contortionists. Next, Blossom Seeley and Benny Fields sing a duet of the song, "Why Don't You Practice What You Preach". Third up, father and son Pat Rooney and Pat Rooney Jr. perform a recitation and dance musing about if they will ever be as clever as their dad. And the last act on the bill is The Runaway Four, a group of comic acrobats.

All at Sea is a 1933 American black and white film directed by E.H. Kleinert and written by Ballard MacDonald.

Showcasing many songwriters of the 1890s, including William McKenna, Harry Armstrong, and eighty-six year old Theodore Metz (who wrote "A Hot Time in the Old Town Tonight"). For a special treat, we get to see Maude Lambert sing "When Irish Eyes Are Smiling."