Jobless sportswriter Eddie Willis is hired by corrupt fight promoter Nick Benko to promote his current protégé, an unknown Argentinian boxer named Toro Moreno. Although Moreno is a hulking giant, his chances for success are hampered by a powder-puff punch and a glass jaw. Exploiting Willis' reputation for integrity and standing in the boxing community, Benko arranges a series of fixed fights that propel the unsophisticated Moreno to #1 contender for the championship. The reigning champ, the sadistic Buddy Brannen, harbors resentment at the publicity Toro has been receiving and vows to viciously punish him in the ring. Eddie must now decide whether or not to tell the naive Toro the truth.

Discovery by Flo Ziegfeld changes a girl's life but not necessarily for the better, as three beautiful women find out when they join the spectacle on Broadway: Susan, the singer who must leave behind her ageing vaudevillian father; vulnerable Sheila, the working girl pursued both by a millionaire and by her loyal boyfriend from Flatbush; and the mysterious European beauty Sandra, whose concert violinist husband cannot endure the thought of their escaping from poverty by promenading her glamor in skimpy costumes.

A charming racketeer seduces the DA's stepdaughter for revenge, then falls in love.

Having to leave Melbourne in a hurry to avoid various marriage proposals, two song-and-dance men sign on for work as divers. This takes them to an idyllic island on the way to Bali where they vie with each other for the favours of Princess Lala. The hazardous dive produces a chest of priceless jewels which arouses the less romantic interest of some shady locals.

Doc and Wishey run into some Nazi-agents, who want to smuggle bombs into the USA from a Mexican border hotel.

Constance Shaw, a Broadway dance star, and Joseph Rivington Reynolds, a keen fan of hers, marry after she breaks up with her fiancé. Connie thinks Joseph owns a gold mine, but he actually works as a presser at a hotel valet shop. When everyone learns what he really is, Joseph is banned from the theater. When he sneaks in again, he learns of a plot to set off a bomb in the adjoining munitions warehouse.

Boyhood friends grow up into different professions: one a dedicated Canadian Mountie, the other a notorious gambler.

Journalist brothers feud over a woman they both fall for while covering World War II in the far east.

A gangster hides out on a farm and falls for the farmer's daughter.

Conniving Broadway starlet Mida King has plenty of enemies, so when she's found murdered at Grand Central Station, Inspector Gunther calls together a slew of suspects for questioning. Mida's shady ex-flame, Turk, seems the most likely culprit, but when smart-mouthed private eye Rocky Custer -- also a suspect himself -- begins to piece together the crime, a few clues that Gunther has overlooked come to light.

Milton Haskins, a math genius known for his infallibility with numbers, quits his job with an insurance company when he discovers he made a mistake, and hooks up with a traveling carnival. His knowledge of mathematics makes him a natural as an assistant at the wheel of fortune. His fiancée begs him to return to his job but he refuses, so she joins the carnival and becomes a striptease artist. When Milton attempts to drag her off the stage, a brawling mêlée breaks out and the entire troupe is arrested by the local police. The carnival is sold but Milton reveals that the new owner has conspired to defraud the insurance company. The insurance company has to accept the carnival in lieu of the money owed, and they allow Milton and his fiancée, Vivian, to stay with and help run the carnival.

Joe Palooka goes blind during a fight. An operation restores his vision, but he's told not to fight for a year. His trainer Knobby has picked up another fighter, but gangsters are pressing him to fix fights. Joe decides to risk his eyesight to save Knobby's honor.

With his high school graduation behind him, Andy Hardy decides that as an adult, it's time to start living his life. Judge Hardy had hoped that his son would go to college and study law, but Andy isn't sure that's what he wants to do so he heads off to New York City to find a job. Too proud to accept any help from Betsy Booth, Andy finds that living on his own isn't so easy. With perseverance he eventually finds a job and even gets to date the pretty receptionist in his office. He also has to face several of life's lessons leading him to conclude that he may still have a bit of growing up to do.

In this "Romance of Celluloid", MGM showcases performers whose careers are just starting. Excerpts from their recently released films are included. The narrator says that moviegoers will have to decide whether these fledgling actors and actresses have that certain quality that made superstars out of MGM players Clark Gable, Spencer Tracy, and Lana Turner.