Professor Julius F. Kelp / Buddy Love / Baby Kelp

Jerry Lewis

Acting

Stella Purdy

Stella Stevens

Acting

Dr. Hamius R. Warfield

Del Moore

Acting

Gibson, College Student

Henry Gibson

Acting

Millie Lemmon

Kathleen Freeman

Acting

Man in Gym (uncredited)

Richard Kiel

Acting

Football Player

Norman Alden

Acting

Mr. Elmer Kelp

Howard Morris

Acting

Edwina Kelp

Elvia Allman

Acting

Dr. M. Sheppard Leevee

Milton Frome

Acting

Rube

Doodles Weaver

Acting

Gym Attendant (uncredited)

Murray Alper

Acting

Bartender

Buddy Lester

Acting

Football Player

Med Flory

Acting

Bored Man

Seymour Cassel

Acting

Waitress (uncredited)

Stephanie Hill

Acting

English Student

Marvin Kaplan

Acting

Football Player

Skip Ward

Acting

Plumber (uncredited)

Billy Bletcher

Acting

College Student (uncredited)

Robert Donner

Acting

Narrator (voice) (uncredited)

Art Gilmore

Acting