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
Elvia Allman
Edwina Kelp
Milton Frome
Dr. M. Sheppard Leevee
Doodles Weaver
Rube
Murray Alper
Gym Attendant (uncredited)
Buddy Lester
Bartender
Med Flory
