Mary and Larry are are a modestly successful skating team. Shortly after their marriage, Mary gets a picture contract, while Larry is sitting at home, out of work.
An orphan is provisionally adopted by the manager of a hotel populated by show business people. The hotel's owner doesn't like the entertainers and wants the girl returned to the orphanage.
When the representative of the Paris International Dance Exposition arrives in New York to invite the Academy Ballet of America to compete for monetary prizes, the taxi driver mistakenly brings him to the Club Ballé, a nightclub on the brink of declaring bankruptcy. The owners, Terry Moore and Duke Dennis, jump at the chance to go, despite being aware of the mistake. They hire ballet teacher, Luis Leoni, and his only pupil, Kay Morrow, to join the group, hoping to teach their two dozen show girls ballet en route to Paris by ship. Also going along and rooming with Kay is Mona, Terry's ex-wife, who wants to keep an eye on her alimony checks. Naturally, Kay and Terry fall in love.
Classical violinist, Roger Grant disappoints his family and teacher when he organizes a jazz band, but he and the band become successful. Roger falls in love with the band's singer, Stella, but his reluctance to lose her leads him to thwart her efforts to become a solo star. When the World War separates them in 1917, Stella marries Roger's best friend and, when Roger returns home after the war, an important concert at Carnegie Hall brings the corners of the romantic triangle together.
Rebecca's Uncle Harry leaves her with Aunt Miranda who forbids her to associate with show people. But neighbor Anthony Kent is a talent scout who secretly set it up for her to broadcast.
Lady Alyce Marshmorton must marry soon, and the staff of Tottney Castle have laid bets on who she'll choose, with young Albert wagering on 'Mr. X'. After Alyce goes to London to meet a beau she is restricted to the castle to curb her scandalous behavior. Albert then summons Jerry to Alyce's aid in order to 'protect his investment'.
Nina Maria Azara is the beautiful and alluring singing spy for Spain during the Napoleonic Wars. Her mission is to seduce French officers, in order for them to reveal Napoleon's intentions toward Spain. She is sent to Bayonne, France to gather military secrets. Prior to this, she meets Don Diego while performing at a club. Unknown to her, Don Diego is actually Captain Andre, who is sent to Spain to spy on her. While in France, Nina discovers Diego's true identity, only after she has fallen in love with him. Nina Maria outwits her potential captors, returns to Spain and goes into hiding. Napoleon's troops invade Spain, resulting in Nina's capture. In a strange twist of fate, Nina and Captain Andre are reunited, but the 2 nations are now at war...
Heidi is orphaned and her uncaring maternal Aunt Dete takes her to the mountains to live with her reclusive, grumpy paternal grandfather, Adolph Kramer. Heidi brings her grandfather back into mountain society through her sweet ways and sheer love. When Dete later returns and steals Heidi away to become the companion of a rich man's wheelchair-bound daughter, the grandfather is heartsick to discover his little girl missing and immediately sets out to get her back.
Winfield College students rebel against a stodgy professor who won't permit "swing" music be played in their varsity show. They appeal to a big Broadway alumnus and have him direct their show. What they don't know is that this "star's" last three shows were flops.
Steve Raleight wants to produce a show on Broadway. He finds a backer, Herman Whipple and a leading lady, Sally Lee. But Caroline Whipple forces Steve to use a known star, not a newcomer. Sally purchases a horse, she used to train when her parents had a farm before the depression and with to ex-vaudevillians, Sonny Ledford and Peter Trott she trains it to win a race, providing the money Steve needs for his show.
Doctor Hugo Hackenbush, Tony, and Stuffy try and save Judy's farm by winning a big race with her horse. There are a few problems. Hackenbush runs a high priced clinic for the wealthy who don't know he has his degree in Veterinary Medicine.
The partners of stage-producer J. J. Hobart gamble away the money for his new show. They enlist a gold-digging chorus girl to help get it back by conning an insurance company. But they don’t count on the persistence of insurance man Rosmer Peck and his secretary Norma Perry.
Chin-Ching gets lost in Shanghai and is befriended by American playboy Tommy Randall. She falls asleep in his car which winds up on a ship headed for America. Susan Parker, also on the ship, marries Randall to give Chin-Ching a family.
The three Craig sisters – Penny, Kay, and Joan – go to New York to stop their divorced father from marrying gold digger Donna Lyons and re-unite him with their mother.
On leave, a sailor falls in love with a young lady aspiring to become a Broadway dancer, but their relationship is jeopardized by an established Broadway star, who is also enamored by him.