Jerry Lewis
Professor Julius F. Kelp / Buddy Love / Baby Kelp
Acting
Stella Stevens
Stella Purdy
Acting
Del Moore
Dr. Hamius R. Warfield
Acting
Henry Gibson
Gibson, College Student
Acting
Kathleen Freeman
Millie Lemmon
Acting
Richard Kiel
Man in Gym (uncredited)
Acting
Norman Alden
Football Player
Acting
Howard Morris
Mr. Elmer Kelp
Acting
Elvia Allman
Edwina Kelp
Acting
Milton Frome
Dr. M. Sheppard Leevee
Acting
Doodles Weaver
Rube
Acting
Murray Alper
Gym Attendant (uncredited)
Acting
Buddy Lester
Bartender
Acting
Med Flory
Football Player
Acting
Seymour Cassel
Bored Man
Acting
Stephanie Hill
Waitress (uncredited)
Acting
Marvin Kaplan
English Student
Acting
Skip Ward
Football Player
Acting
Billy Bletcher
Plumber (uncredited)
Acting
Robert Donner
College Student (uncredited)
Acting
Art Gilmore
Narrator (voice) (uncredited)
Acting