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