Bud Baxter is a minor clerk in a huge New York insurance company, until he discovers a quick way to climb the corporate ladder. He lends out his apartment to the executives as a place to take their mistresses. Although he often has to deal with the aftermath of their visits, one night he's left with a major problem to solve.
| C.C. Baxter | Jack Lemmon |
| Fran Kubelik | Shirley MacLaine |
| Jeff D. Sheldrake | Fred MacMurray |
| Joe Dobisch | Ray Walston |
| Dr. Dreyfuss | Jack Kruschen |
| Al Kirkeby | David Lewis |
| Mrs. Margie MacDougall | Hope Holiday |
| Sylvia | Joan Shawlee |
| Mrs. Mildred Dreyfuss | Naomi Stevens |
| Karl Matuschka | Johnny Seven |
| The Blonde | Joyce Jameson |
| Mr. Vanderhoff | Willard Waterman |
| Mr. Eichelberger | David White |
| Miss Olsen | Edie Adams |
| Office Worker (uncredited) | Dorothy Abbott |
| Office Worker (uncredited) | Ralph Moratz |
| Office Maintenance Man (uncredited) | Joe Palma |
| TV Movie Host (uncredited) | Bill Baldwin |
| Charlie - Bartender (uncredited) | Benny Burt |
| Elevator Supervisor with Clicker (uncredited) | Lynn Cartwright |
| Bit Part (uncredited) | Mason Curry |
| Messenger (uncredited) | David Macklin |
| Man in Santa Claus Suit (uncredited) | Hal Smith |
| Office Worker (uncredited) | Paul Bradley |
| Restaurant Patron (uncredited) | Steve Carruthers |
| Bar Patron (uncredited) | Dick Cherney |
| Office Worker (uncredited) | Franklyn Farnum |
| Restaurant Patron (uncredited) | Herschel Graham |
| Office Worker (uncredited) | Lars Hensen |
| Office Worker (uncredited) | Eugene Jackson |
| Mrs. Lieberman (uncredited) | Frances Weintraub Lax |
| Executive (uncredited) | William Meader |
| Office Worker (uncredited) | Monty O'Grady |
| Bar Patron (uncredited) | Paul Power |
| Executive (uncredited) | Tony Regan |
| Restaurant Patron (uncredited) | Clark Ross |
| Office Worker (uncredited) | Norman Stevans |
| Williams (uncredited) | Sid Troy |
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