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