When an aspiring barber becomes inadvertently involved in the theft of a valuable diamond, necessity forces him to masquerade as a 12 year-old child - with humorous consequences.

Dean Martin
as Bob Miles

Jerry Lewis
as Wilbur Hoolick

Diana Lynn
as Nancy Collins

Nina Foch
as Gretchen Brendan

Raymond Burr
as Noonan

Mitzi McCall
as Skeets Powell

Veda Ann Borg
as Mrs. Noonan

Margery Maude
as Mrs. Ella Brendan

Romo Vincent
as Ticket Agent

Nancy Kulp
as Marty's Mother