Doctor (later Professor) John Hardy is a forensic scientist who works not only for the police but also for other interested parties.
| Season | From | To | Episodes |
|---|---|---|---|
| All Seasons | |||
| Specials | 0 | ||
| Season 1 | July 1968 | September 1968 | 13 |
| Season 2 | April 1969 | September 1969 | 26 |
| Season 3 | January 1971 | March 1971 | 13 |
| Season 4 | September 1976 | November 1976 | 10 |
| Unassigned Episodes | 1 |
| Season | From | To | Episodes |
|---|---|---|---|
| Unassigned Episodes | 63 |
| Season | From | To | Episodes |
|---|---|---|---|
| Season 1 | 0 | ||
| Unassigned Episodes | 63 |
| Name | Number of Episodes | Dates | |
|---|---|---|---|
| N.J. Crisp | 2 | 09/05/1969 - 09/24/1976 | |
| John Gould | 2 | 04/11/1969 - 03/28/1971 | |
| Ray Jenkins | 1 | 02/14/1971 | |
| Jane Baker | 1 | 11/26/1976 | |
| Allan Prior | 1 | 10/15/1976 | |
| Robert Barr | 1 | 07/04/1969 | |
| Henry Lincoln | 1 | 09/19/1968 | |
| Pip Baker | 1 | 11/26/1976 | |
| Mervyn Haisman | 1 | 09/19/1968 |
| Name | Number of Episodes | Dates | |
|---|---|---|---|
| Ronald Wilson | 2 | 09/19/1968 - 07/04/1969 | |
| Prudence Fitzgerald | 2 | 09/05/1969 - 03/28/1971 | |
| Hugh David | 1 | 04/11/1969 | |
| Gerard Glaister | 1 | 09/24/1976 | |
| Ben Rea | 1 | 02/14/1971 | |
| Gerald Blake | 1 | 11/26/1976 |
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