| 1 | Charles T. | Betterton | Missing famous scientist. aka: Tom. |
| | Colonel | Wharton | Police investigating Tom's missing case. |
| | Olive | Betterton | Tom's wife. |
| | Mr. | Bessop | Security agent. |
| | Dr. | Evans | Tom's wfriend. |
| | Walter | Griffiths | Tom's friend from abroad. |
| | Mark | Lucas | Tom's friend. Research chemist. |
| | Carol | Speeder | Tom's friend from abroad. |
| | Boris | Glydr | Elsa's Polish cousin. aka: Glyn, Glider. |
| 2 | Professor | Manheim | Elsa's father. |
| | Elsa | Manheim | Professor Manheim's daughter. Tom's first wife. |
| 3 | Hilary | Craven | Depressed woman. Pretended to be Olive. |
| | Nigel | | Hilary's former husband. |
| | Brenda | | Hilary's deceased daughter. |
| | Dr. | Grey | Hilary's doctor. |
| 5 | Calvin | Baker | American traveller. Somebody Hilary met at the plane. |
| | Janet | Hetherington | British traveller. Somebody Hilary met at the plane. |
| | Jeane | Maricot | Brunette tourist. |
| 6 | Henri | Laurier | Frenchman that assisted Hilary in Casa Blanca. |
| | Mr. | Aristides | One of the richest men in the world. Philanthropist. |
| 8 | Andrew | Peters | Calvin's friend. Research chemist. |
| | Torquil | Ericsson | Calvin's friend. Physicist. |
| | Louis | Barron | Frenchman traveller. Bacteriologist. |
| 9 | Belga | Needheim | Calvin's friend. Endocrinologist. |
| 11 | Miss | Jennson | Somebody Hilary met in the unit. |
| | Paul | Van Heidem | Assisted Hilary in the unit. |
| 12 | Dr. | Schwartz | Medical examiner in Leper Colony. |
| | Dr. | Rubec | Psychologist. |
| | La | Roche | Assisted Hilary in the dress department. |
| | Dr. | Nielson | Deputy director. |
| 13 | Simon | Murchinson | Doctor. |
| | Bianca | Murchinson | Simon's wife. |
| 14 | M. | Le Blanc | French investigator. |
| 17 | Sidi | | Mohammed's wife. |
| | Mohammed | | African man in Leper Colony. |
| 18 | George | | Hilary's uncle. |
| 19 | Lord | Alverstoke | Minister. |
| | Jeffrey | | English scientist. |
| | | Davidson | English scientist. |
