Once Is Not Enough (1975) — Cast
Cast
| Trudy Marshall | Myrna |
| Michael Millius | Beautiful Lounger |
| Eddie Garrett | Maitre d' |
| Leonard Sachs | Peterson |
| George Hamilton | David |
| Gary Conway | Hugh Hefner |
| Ann Marie Moelders | Klappenjunge 'Morocco' |
| Tony Regan | Bar Patron |
| Kirk Douglas | Damian Wayne |
| Kelly Lange | Weather Forecaster |
| John Roper | Franco |
| Sig Frohlich | Waiter |
| Ethelreda Leopold | (uncredited) |
| Lillian Randolph | Mabel Tanaka |
| Alexis Smith | Deidre |
| Harley Farber | Beautiful Lounger |
| Maureen McCluskey | Beautiful Lounger |
| Phil Foster | Cab Stealer |
| Deborah Raffin | January |
| Brenda Vaccaro | Linda |
| Renata Vanni | Maria Schneider |
| Melina Mercouri | Karla Fry |
| Jim Boles | Scotty |
| Norman Stevans | Bar Patron |
| David Janssen | Colt |
| Tony Ferrara | Beautiful Lounger |
| Mark Roberts | Rheingold |
Crew
| John DeCuir | Production Design |
| Dan Perri | Title Designer |
| Ruby R. Levitt | Set Decoration |
| Hank Edds | Makeup Artist |
| Irving Mansfield | Executive Producer |
| Lee Harman | Makeup Artist |
| Moss Mabry | Costume Design |
| Vivienne Walker | Hairstylist |
| Howard W. Koch | Producer |
| Guy Green | Director |
| Julius J. Epstein | Writer |
| Jacqueline Susann | Novel |
| Rita Roland | Editor |
| John A. Alonzo | Director of Photography |
| Henry Mancini | Original Music Composer |