Jerry Lewis as Peter J. Ingersoll / Fred Dobbs

Peter Lawford as Dr. Scott Carter

Anne Francis as Nancy Ingersoll

Pedro Gonzalez Gonzalez as Perfecto

Jennifer Edwards as Jennifer Ingersoll

Jimmy Miller as Jimmy Ingersoll

Eleanor Audley as Mrs. Durham

Henry Corden as Kenyon Hammercher

Sylvia Lewis as Karlotta Hammercher

Phillip Pine as Head Surgeon

Felipe Turich as Foreign Mortician

Kathleen Freeman as Mrs. Hardtack - Baby Sitter

Scatman Crothers as The Corpse (uncredited)

Byron Foulger as Funeral Director (uncredited)

Al Bain as Burial Spectator (uncredited)

Anthony Larry Paul as Credit Card Man (uncredited)

Art Lewis as Toothpick Man (uncredited)

Frankie Darro as Delivery Man (uncredited)

Elizabeth Germaine as Miss Freitas (uncredited)

Norman Leavitt as Dr. Everson (uncredited)

Harlan Warde as District Attorney (uncredited)

Margaret Teele as Nurse Susan (uncredited)

Ted Smile as Arm Wrestler (uncredited)

Alberto Morin as Portuguese Passport Official (uncredited)

John Stacy as Surgeon (uncredited)

William O'Connell as Hotel Clerk (uncredited)