In Acapulco, Hercule Poirot attends a dinner party in which one of the guests clutches his throat and suddenly dies. The causes seem to be natural until another party with most of the same guests produces another corpse.
| Actor | Role |
|---|---|
 Peter UstinovHercule Poirot | Hercule Poirot |
 Tony CurtisCharles Cartwright | Charles Cartwright |
 Emma SammsEgg | Egg |
 Jonathan CecilCapt. Arthur Hastings | Capt. Arthur Hastings |
 Fernando AllendeRicardo Montoya | Ricardo Montoya |
 Pedro Armendáriz Jr.Col. Mateo | Col. Mateo |
 Lisa EichhornCynthia Dayton | Cynthia Dayton |
 Dana ElcarDr. Strange | Dr. Strange |
 Frances Lee McCainMiss Milray | Miss Milray |
 Marian MercerDaisy Eastman | Daisy Eastman |
 Diana MuldaurAngela Stafford | Angela Stafford |
 Nicholas PryorFreddie Dayton | Freddie Dayton |
 Concetta TomeiJanet Crisp | Janet Crisp |
| JJacqueline EvansMrs. Babbington | Mrs. Babbington |
| ÁÁngeles GonzálezHousekeeper | Housekeeper |
| PPhilip GuilmantReverend Babbington | Reverend Babbington |
 Claudia GuzmánRosa | Rosa |
| RRodolfo HernándezMiguel | Miguel |
 Martin LaSalleDoctor | Doctor |
| AAlma LevyNurse | Nurse |
| JJulio MonterdeManager | Manager |
| RRené PereyraWaiter | Waiter |
 José ChávezWatchman | Watchman |