The Expert The Visitor: Part 1: Hypothesis (1968–1976) Online
- Original Title :
- The Visitor: Part 1: Hypothesis
- Genre :
- TV Episode / Crime / Drama
- Year :
- 1968–1976
- Directror :
- Prudence Fitzgerald
- Cast :
- Marius Goring,Ann Morrish,Victor Winding
- Writer :
- N.J. Crisp,Gerard Glaister
- Type :
- TV Episode
- Time :
- 50min
- Rating :
- 6.9/10
| Episode credited cast: | |||
 | Marius Goring | - | Prof. John Hardy |
 | Ann Morrish | - | Dr. Jo Hardy |
| Victor Winding | - | Det. Chief Insp. Fleming |
| Michael Farnsworth | - | Det. Sgt. Ashe |
| Rest of cast listed alphabetically: | |||
 | Harry Beety | - | Insp. Lawrence |
| John Collin | - | Det. Chief Supt. Mowbray |
| Michael Johnson | - | Martin |
| Desmond Jordan | - | Caretaker |
| Clare Kelly | - | Mrs. Clark |
| Anne Kristen | - | Susan |
| Neil McCallum | - | Cooper |
 | Louise Pajo | - | Sally |
 | Geoffrey Palmer | - | Asst. Chief Con. Rogers |
| Veronica Strong | - | Vivien |