Mr. Dithers invites the Bumsteads on a South American cruise. Somehow Dagwood winds up as the female drummer in the ship's band, while Penny Singleton gets to show off her Broadway background in some lively musical numbers.

A scientist spills a new serum in his lab, accidentally inhales its fumes, and turns into a murderous monster who kills anyone he touches.

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.

Horse breeders Adams and Brock are vying for the Army contract. When Adams is killed trying to ride his horse Trigger, Roy saves the horse from being shot. He trains him and then plans to ride him in the race to win the contract.

A lawyer is framed for the murder of a young party girl and tries to clear his name.

Lambert owns the trucking line that ships cattle to market. When he raises his rates Roy decides to ship the cattle on the River Boat. When Lambert and his men are unable to stop the boat, they rustle the cattle.

A radio detective sets out to solve an old murder case, with the help of her sound man and another radio detective. They manage to talk to the people involved in the case, but shortly afterwards the main suspects turn up dead.

A radio saleswoman helps a singing cattleman trap a shady meat buyer with a bogus broadcast.

Carol (Ruth Terry), the cigarette girl at a swank Palm Springs hotel, dreams of singing in the establishment's nightclub. She gets a chance when her well-to-do uncle, "Colonel" Morgan (Alan Mowbray), and a pal blow into town ... until their visit turns out to be a con job. Carol's voice impresses the bandleader (Robert Livingston), but the hotel manager (Franklin Pangborn), still smarting from Morgan's chicanery, isn't ready to give her a chance.

A history of Republic Pictures studios, featuring hundreds of clips plus on-camera interviews with stars, director, stuntman, etc.