Broadway producer Jerry Flynn is anxious to recapture the magic and reclaim the crowds after a set of costly flops. Outside his theater one night, Flynn meets a young boy who just might save the day. Inside a small box the boy shows Flynn his pride and joy: a caterpillar named Curly that dances to Yes Sir, That's My Baby. Word quickly spreads about the amazingly talented hoofer, and the caterpillar becomes a symbol of hope for wartime America. Soon, offers are pouring in to capitalize on this sensational insect.
A newspaper columnist and host of his own national network radio program, interviewing more film personalities on his show than any other commentator, is searching for a story for a Sunday column carried by newspaper from coast to coast. Hanging out in Hollywood's famed Trocadero restaurant and night-spot, he gets his story when "Troc" owner and band-leader Eddie LeBaron, relates to him the sage of the famed screenland nitery. And hears plenty of music furnished by four of the top name-bands in the land, including that of Bob Chester, who formed his own swing band in 1935 after being top saxophonist with the bands of Ben Pollack and Ben Bernie. Singer Ida James and the Chester band led off with "Shoo Shoo Baby" in their screen debut.
Jimmy O'Brien (Robert Lowery)and Sammy Rubin (Sidney Miller), write jingle commercials for radio, and meet Mary Adams (Dona Drake), who wants to break into radio as a soloist for a band.
Radio singer Joan Abbott, known as the "Crunchy-Wunchy Thrush", does not want to renew her contract with the cereal sponsor, as she wants to go to college. But her guardian, her Uncle Willie signs the contract in order to pay off his own debts. But this time Joan won't take no for an answer and enrolls under an assumed name. When Joan goes missing, the radio institutes a search for Joan via a publicity stunt.
A down-on-his luck actor teams up with a singing barber to do a vaudeville act. Its success eventually leads them to Broadway, but things start to go awry.
In WW I dancer Jerry Jones stages an all-soldier show on Broadway, called Yip Yip Yaphank. Wounded in the War, he becomes a producer. In WW II his son Johnny Jones, who was before his fathers assistant, gets the order to stage a knew all-soldier show, called THIS IS THE ARMY. But in his pesonal life he has problems, because he refuses to marry his fiancée until the war is over.
A young soldier on a pass in New York City visits the famed Stage Door Canteen, where famous stars of theatre and film appear and host a recreational center for servicemen during the war. The soldier meets a pretty young hostess and they enjoy the many entertainers and a growing romance.
Muggs' rich Uncle Pete is coming to visit. Unfortunately, Muggs' late father had bragged that he had seven kids, so Muggs recruits the members of the gang to pose as his family. Things turn sour, however, when a local mobster finds out about Muggs' deception and threatens to expose it.
Tim McGuerin and Eddie Corbett operates a big taxi-fleet company together and because of a misunderstanding Tim's wife Sadie thinks he is having an affair with his secretary, Ms. Lucy Gibbs. To annoy Tim, Sadie starts taking classes with a fitness instructor, Samson, and later going with him to his out-of-town health club. To sort out all the misunderstandings both Tim and Eddie go to the health club as well.
The East Side Kids find a young girl in the apartment of a man who has just been murdered. Believing her to be innocent, they hide her in their clubhouse while they try to find the real killer. The killer, however, used a baseball bat as his murder weapon, and the bat has the fingerprints of one of the gang on it.
Sisters Ruth and Eileen Sherwood move from Ohio to New York in the hopes of building their careers. Ruth wants to get a job as a writer, while Eileen hopes to succeed on the stage. The two end up living in a dismal basement apartment in Greenwich Village, where a parade of odd characters are constantly breezing in and out. The women also meet up with magazine editor Bob Baker, who takes a personal interest in helping both with their career plans.
Hilarity ensues when a falsely accused fugitive from justice hides at the house of his childhood friend, which she has recently rented to a high-principled law teacher.