 | Jerry Lewis als Peter J. Ingersoll / Fred Dobbs |
 | Peter Lawford als Dr. Scott Carter |
 | Anne Francis als Nancy Ingersoll |
 | Pedro Gonzalez Gonzalez als Perfecto |
 | Jennifer Edwards als Jennifer Ingersoll |
 | Jimmy Miller als Jimmy Ingersoll |
 | Eleanor Audley als Mrs. Durham |
 | Henry Corden als Kenyon Hammercher |
 | Sylvia Lewis als Karlotta Hammercher |
 | Phillip Pine als Head Surgeon |
| Felipe Turich als Foreign Mortician |
 | Kathleen Freeman als Mrs. Hardtack - Baby Sitter |
 | Scatman Crothers als The Corpse (uncredited) |
 | Byron Foulger als Funeral Director (uncredited) |
 | Al Bain als Burial Spectator (uncredited) |
| Anthony Larry Paul als Credit Card Man (uncredited) |
| Artie Lewis als Toothpick Man (uncredited) |
 | Frankie Darro als Delivery Man (uncredited) |
| Elizabeth Germaine als Miss Freitas (uncredited) |
 | Norman Leavitt als Dr. Everson (uncredited) |
 | Harlan Warde als District Attorney (uncredited) |
| Margaret Teele als Nurse Susan (uncredited) |
| Ted Smile als Arm Wrestler (uncredited) |
 | Alberto Morin als Portuguese Passport Official (uncredited) |
 | John Stacy als Surgeon (uncredited) |
 | William O'Connell als Hotel Clerk (uncredited) |
| George Marshall | Director |
| Rod Amateau | Story |
| David Davis | Story |
| Rod Amateau | Screenplay |
| Dick Stabile | Original Music Composer |
| Jerry Lewis | Producer |
| Joe E. Stabile | Associate Producer |
| Joe Luciano | Assistant Editor |
| John Beckman | Art Direction |
| Richard M. Rubin | Property Master |
| Hazel W. Hall | Script Supervisor |
| Frank Tuttle | Set Decoration |
| Al Overton | Sound |
| Guy C. Verhille | Wardrobe Designer |
| Hal Bell | Assistant Director |
| Jack Stone | Makeup Artist |
| Arthur Piantadosi | Sound |
| Russel Wiles | Editor |
| Charles J. Rice | Sound Supervisor |
| W. Wallace Kelley | Director of Photography |
| Ben Lane | Makeup Supervisor |
| Virginia Jones | Hairstylist |
| Herb Wallerstein | Unit Production Manager |
