| Name | Character | Episodes |
|---|---|---|
| Siân Phillips | Frau Sesemann | 2 |
| Noley Thornton | Heidi | 2 |
| Andrew Bicknell | Herr Sesemann | 2 |
| Jane Seymour | Fräulein Rottenmeier | 2 |
| Lexi Randall | Klara | 2 |
| Jason Robards | Grandfather | 2 |
| Daniel Flynn | John | 2 |
| Patricia Neal | Grandmother | 2 |
| Roger Ashton-Griffiths | Churchman | 2 |
| John Quentin | Pastor | 2 |
| Soo Drouet | Sonja | 2 |
| Edward Highmore | Herr Kandidat | 2 |
| Kate Isitt | Brigitte | 2 |
| Michael Simkins | Doctor | 2 |