| Name | Character | Episodes |
|---|---|---|
| Cesar Romero | 24 | |
| Dan Seymour | 24 | |
| John Hamilton | 2 | |
| William Henry | 1 | |
| Lester Matthews | U.S. Consul Charlie Edmunds | 1 |
| Carolyn Jones | Sally Towne | 1 |
| George E. Stone | 1 | |
| Frank Puglia | Police Chief | 1 |
| Ted de Corsia | Jan Spolny | 1 |
| Peter Brocco | Dolezal | 1 |
| Nestor Paiva | 1 | |
| Paul Picerni | Eddie Matera | 1 |
| Frank Wilcox | Anderson | 1 |
| Walter Reed | Standish | 1 |
| Hy Averback | Col. Boris Zarkow | 1 |
| Albert Carrier | 1 | |
| George Cisar | Cliff Harding | 1 |
| Virginia Christine | 1 | |
| Carl Esmond | Fabian | 1 |
| Carl Esmond | 1 | |
| Sol Gorss | 1 | |
| John Warburton | 1 | |
| Alexander Campbell | 1 |