| Name | Character | Episodes |
|---|---|---|
| Randy Stuart | Louise Baker | 26 |
| Alan Hale Jr. | Biff Baker | 26 |
| Charles Bronson | Wilhelm | 6 |
| Lee Marvin | Captain Hollis Michler | 5 |
| Charles Bronson | Czech spy | 1 |
| Robert Warwick | Commander | 1 |
| Lee Marvin | Michler / Captain Hollis | 1 |
| William Boyett | Soldier | 1 |
| Peter Graves | 1 | |
| Henry Brandon | 1 | |
| Alan Napier | Prof. Artemus Beechem | 1 |
| Mort Mills | Soldier | 1 |
| Kenneth Tobey | Tommy Allen | 1 |
| Lawrence Dobkin | Shahab Hussein | 1 |
| Walter Reed | 1 | |
| Leon Askin | Reicher | 1 |
| Terry Frost | Johnson | 1 |
| Lomax Study | 1 | |
| Harry Lauter | George Carlton | 1 |
| Ian MacDonald | Hank | 1 |
| Rick Vallin | 1 | |
| Carl Milletaire | 1 | |
| Charles Stevens | Casmar | 1 |
| Jay Novello | Maurice | 1 |