USA
Roy Markham, a former successful New York attorney, becomes a private detective and his cases take him worldwide. For the first two months of the show, Markham had an assistant, John Riggs, but he was dropped and Markham had to do everything himself. - IMDb
| Markham | USA |
| Markham |  South Africa |
| Markham |  Australia |
| Markham |  Canada |
| Markham |  Spain |
| Markham |  Finland |
| Markham |  United Kingdom |
| Markham |  Ireland |
| Markham |  India |
| Markham |  New Zealand |
 |
Bryan Russell [8] | Robby Carson (TV Episode: Sing a Song of Murder) (1960) |
 |
Butch Bernard [12] | Jimmy Standish (TV Episode: The Young Conspirator) (1960) |
 |
Tom Nolan [12] | Jimmy Standish (TV Episode: The Young Conspirator) (1960) |
 |
Terry Burnham [11] | Judy Frost (TV Episode: The Cruelest Thief) (1960) |
