A dashing Mississippi river gambler wins the affections of the daughter of the owner of the Show Boat.

Despite her mother's objections, the naive young daughter of a show boat captain is thrust into the limelight as the company's new leading lady.

A young pacifist after refusing on principle to defend her sweetheart's honor and being banished in disgrace, joins a riverboat troupe as a singer, acquires a reputation as a crackshot after a saloon brawl in which the villain of the piece accidentally kills himself with his own gun, falls in love with his former fianceé's sister and finally bullies an apprehensive family into accepting him.

In the gay '90s, cardsharps take over a Mississippi riverboat from a kindly captain. Their first act is to change the showboat into a floating gambling house. A ham actor and his bumbling sidekick try to devise a way to help the captain regain ownership of the vessel.

Margie, singer on a showboat, decides to try her luck in New York inspite of being in love with the owners grandson. She is successful, but suddenly she hears that the showboat is in deep financial trouble, and she calls all the boats former stars to join in a big show to rescue it.

Daydreaming waitress Jennie Hagen fantasizes about becoming a famous actress, while in reality she and her cook boyfriend, Orme Wilson, hope to one day own their own diner. Although Orme loves Jennie, he also has a weakness for stage stars -- so when a riverboat theatrical crew comes to their town, he is smitten by lead actress Lillian Lyons. Desperate to keep Orme, Jennie insists on going onstage to best Lillian, but is soon out of her depth.

A Broadway musical comedy star tires of the same old grind and flees the city. She runs into the skipper of a showboat who befriends her, and they make plans to put together a musical revue. But a competing carnival owner hatches a scheme to put an end to the show before it begins.