A fisherman crosses paths with a diamond-smuggling gangster–who is his doppelgänger—and inadvertently takes his place at a resort hotel where he meets a special girl.

Eccentric bellhop Stanley Belt is recruited unexpectedly by the comedy team of a recently deceased entertainer. Stanley struggles to become a song-and-dance man as the team grooms him to become a star. But as the date of a high-stakes appearance on the Ed Sullivan Show grows near, they begin to fear that the only astonishing thing about Stanley is his utter lack of talent.

A timid, nearsighted chemistry teacher discovers a magical potion that can transform him into a suave and handsome Romeo. The Jekyll and Hyde game works well enough until the concoction starts to wear off at the most embarrassing times.

Stanley is a bellboy at the Fountainbleau Hotel in Miami Beach, where he performs his duties quietly and without a word to anyone. All he displays are facial expressions and a comedic slapstick style. And anything that can go wrong, does go wrong when Stanley is involved. One day, Jerry Lewis arrives at the hotel and some of the staff notice the striking resemblance.