"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."
Jerry Lewis
as Professor Julius F. Kelp / Buddy Love / Baby Kelp
Stella Stevens
as Stella Purdy
Del Moore
as Dr. Hamius R. Warfield
Henry Gibson
as Gibson, College Student
Kathleen Freeman
as Millie Lemmon
Richard Kiel
as Man in Gym (uncredited)
Norman Alden
as Football Player
Howard Morris
as Mr. Elmer Kelp
Elvia Allman
as Edwina Kelp
Milton Frome
as Dr. M. Sheppard Leevee
Doodles Weaver
as Rube
Murray Alper
as Gym Attendant (uncredited)
Buddy Lester
as Bartender
Med Flory
Seymour Cassel
as Bored Man
Stephanie Hill
as Waitress (uncredited)
Marvin Kaplan
as English Student
Skip Ward
Billy Bletcher
as Plumber (uncredited)
Robert Donner
as College Student (uncredited)
Art Gilmore
as Narrator (voice) (uncredited)
Walter Scharf
Original Music Composer
Robert R. Benton
Set Decoration
Bill Richmond
Writer
John Woodcock
Editor
Hal Pereira
Art Direction
Edward R. Morse
Casting
Ernest D. Glucksman
Producer
Director
W. Wallace Kelley
Director of Photography
James Grant
Assistant Camera
Ralph Axness
Assistant Director
Edith Head
Costume Design
Sy Devore
Wardrobe Designer
Murray Young
Key Grip
Walter H. Tyler
Arthur P. Schmidt
Associate Producer
Sam Comer
Jack Stone
Makeup Artist
Paul K. Lerpae
Special Effects
Wally Westmore
Makeup Supervisor
Nellie Manley
Hair Supervisor
Martin Pendleton
Property Master
Dorothy Yutzi
Script Supervisor
Marvin Weldon
Dialogue Coach
Charles Grenzbach
Sound Recordist
Hugo Grenzbach
Hal Bell
Assistant Production Manager
Marshall Katz
Producer's Assistant
William Davidson
Production Manager