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

리처드 킬

Man in Gym (uncredited)

Skip Ward

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

Seymour Cassel

Bored Man

Stephanie Hill

Waitress (uncredited)

Marvin Kaplan

English Student

Billy Bletcher

Plumber (uncredited)

Robert Donner

College Student (uncredited)