| Jerry Lewis | Professor Julius Kelp / Buddy Love / Baby Kelp |
| Stella Stevens | Stella Purdy |
| Del Moore | Dr. Hamius R. Warfield |
| Kathleen Freeman | Millie Lemmon |
| Med Flory | Football Player |
| Norman Alden | Football Player |
| Howard Morris | Mr. Elmer Kelp |
| Elvia Allman | Mother Edwina Kelp |
| Milton Frome | Dr. M. Sheppard Leevee |
| Buddy Lester | Purple Pit Bartender |
| Director | Jerry Lewis |
| Producer | Ernest D. Glucksman; Arthur P. Schmidt |
| Writer | Jerry Lewis; Bill Richmond |
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