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.

Bud Abbott
as Dexter Broadhurst

Lou Costello
as Sebastian Dinwiddle

Alan Curtis
as Mr. Crawford

Rita Johnson
as Bonita Farrow

Henry Travers
as Capt. Sam Jackson

Lois Collier
as Miss Caroline Jackson

Joe Sawyer
as Bailey

Joe Kirk
as Croupier

Bill Alcorn
as Specialty Dancer (uncredited)

Audley Anderson
as Card Player (uncredited)