The Stooges are small time song-and-dance performers who are having trouble rehearsing due to loud tapping that is going on one story above them. When they go to give the rowdies a piece of their mind, three lovely ladies named Flo (Lindsay Bourquin), Mary (Laverne Thompson) and Shirley (Betty Phares) come to the door. It turns out the girls are performing their tap dance routine.
The six become friends, with the ladies accompanying the boys when they perform at the Noazark Shipbuilding Company to entertain defense workers. The Stooges slay the audience with their hilarious "Niagara Falls" routine ("slowly I turned, step by step, inch by inch..."). When the boys receive word that the headliners (The Castor and Earl Review) have to bail, the Stooges and the girls offer to take their place. The three ladies perform some breathtaking acrobatics, while the Stooges perform "At the Front." The Stooges' agent, Manny Weeks (John Tyrrell), is so enthralled with the boys' performance that he offers to send the trio to Broadway.
The Stooges nearly leave their ladies, but end up getting married first with a honeymoon planned for — where else? — Niagara Falls.