| Name | Character | Episodes |
|---|---|---|
| Roddy McDowall | Bobby Ballard | 3 |
| Len Birman | Asher Field | 3 |
| Claude Akins | Walter Kendall | 3 |
| René Auberjonois | Dr. Eugene Lyons | 3 |
| Larry Hagman | Col. Edmund Pace | 3 |
| Gene Evans | Col. Barton | 3 |
| Stephen Collins | David Spaulding | 3 |
| John Huston | Ambassador Henderson Granville | 3 |
| Katherine Woodville | Mrs. Cameron | 3 |
| Pedro Armendáriz Jr. | Lt. Fuentes | 3 |
| Ramon Bieri | Daniel Meehan | 3 |
| John Hoyt | German scientist | 3 |
| Jeremy Kemp | Geoffrey Moore | 3 |
| Werner Klemperer | Franz Altmuller | 3 |
| Lauren Hutton | Leslie Jenner Hawkewood | 3 |
| Isela Vega | Anna | 3 |
| John van Dreelen | Dietrich | 3 |
| Trisha Noble | Irene | 3 |
| William Prince | Alex Spaulding | 3 |
| Ben Wright | Dr. Azevedo | 3 |
| José Ferrer | Erich Rhinemann | 3 |
| Thayer David | Industrialist | 3 |
| Zitto Kazann | Senor Uribe | 3 |
| Charles Siebert | Sergeant | 3 |
| Bo Brundin | Heinrich Stolz | 3 |