| Person: | Characters | Episodes | |
| • Paul Trinka | played | 18 Episodes | |
| • Allan Hunt | played | 16 Episodes | |
| • Arch Whiting | played | 10 Episodes | |
| • Richard Bull | played | 8 Episodes | |
| • Paul Carr | played | 5 Episodes | |
| • Mark Slade | played | 4 Episodes | |
| • Patrick Culliton | played | 4 Episodes | |
| • Wayne Heffley | played | 3 Episodes | |
| • Ford Rainey | played | 3 Episodes | |
| • Booth Colman | played | 2 Episodes | |
| • Werner Klemperer | played | 2 Episodes | |
| • Michael Ansara | played | 2 Episodes | |
| • John Zaremba | played | 2 Episodes | |
| • Bert Freed | played | 2 Episodes | |
| • James Frawley | played | 2 Episodes | |
| • Malachi Throne | played | 2 Episodes | |
| • Jan Merlin | played | 2 Episodes | |
| • David Sheiner | played | 2 Episodes | |
| • Robert Cornthwaite | played | 2 Episodes | |
| • Michael Pate | played | 2 Episodes | |
| • Lloyd Bochner | played | 2 Episodes | |
| • James Doohan | played | 2 Episodes | |
| • Alfred Ryder | played | 2 Episodes | |
| • Robert Doyle (1) | played | 2 Episodes | |
| • Robert Lipton | played | 2 Episodes | |
| • Francoise Ruggieri | played | 2 Episodes | |
| • Susan Flannery | played | 2 Episodes | |
| • Harry Davis | played | 2 Episodes | |
| • Vitina Marcus | played | 2 Episodes |