I haven't watched this episode yet.
The character list below is from Wikipedia's cast list.
This episode is often cited as Season 3, Episode 1
| Location of first appearance | Title / Profession | Character | Gen-der | Age | Hair Color | Hair direction / style | Notes |
| Detective | Hercule Poirot | M | 50 | Dark | Back, thinning | Neat moustache | |
| Captain | Arthur Hastings | M | 50 | Light grey | Back left | ||
| Chief Inspector | James Harold Japp | M | 50 | Greying dark brown | Right combed | Thick Moustache | |
| Secretary | Felicity Lemon | F | 40 | Orange | Right, Wavy | ||
| Valet | George | M | 60 | Grey | |||
| Crime novelist | Ariadne Oliver | F | 50 | Light orange | Wavy curly | ||
| John Cavendish | |||||||
| Lawrence Cavendish | |||||||
| Mary Cavendish | |||||||
| Mrs | Emily Inglethorp | ||||||
| Alfred Inglethorp | |||||||
| Evelyn Howard | |||||||
| Edwin Mace | |||||||
| Cynthia Murdoch | |||||||
| Mrs | Dainty | ||||||
| Mrs | Raikes | ||||||
| Dr | Wilkins | ||||||
| Dorcas | |||||||
| Phillips | |||||||
| Summerhaye | |||||||
| Tindermans | |||||||
| Wells | |||||||
| Army Officer | |||||||
| Chemist | |||||||
| Clerk of the Court | |||||||
| Foreman of the Jury | |||||||
| Hire Car Driver | |||||||
| Judge | |||||||
| Nurse | |||||||
| Soldier | |||||||
| Vicar | |||||||