| Name | Character | Episodes |
|---|---|---|
| Anthony Hopkins | Adam Kelno | 2 |
| Juliet Mills | Samantha Cady | 2 |
| Edith Evans | Dr. Parmentier | 2 |
| Julian Glover | Zaminski | 2 |
| Jack Hawkins | Justice Gilroy | 2 |
| Dan O'Herlihy | David Shawcross | 2 |
| Lee Remick | Lady Margaret | 2 |
| Robert Stephens | Robert Highsmith | 2 |
| John Gielgud | Clinton-Meek | 2 |
| Ben Gazzara | Abe Cady | 2 |
| Leslie Caron | Angela Kelno | 2 |
| Anthony Quayle | Tom Banniester | 2 |
| Kristoffer Tabori | Ben Cady | 2 |
| Alan Napier | Semple | 2 |
| Milo O’Shea | Dr. Stanilaus Lotaki | 2 |
| Geoffrey Keen | Magistrate Griffin | 2 |
| Vladek Sheybal | Sobotnik | 2 |
| Michael Gough | Dr. Fletcher | 2 |
| Anthony Andrews | Stephen Kelno | 2 |