| Julian Rome | 詹姆斯·斯派德
 | |
| Dr. Kate Brecher | Janine Eser | |
| Dr. Michael Straub | 约翰·林奇
 | |
| Dr. Alexi Gierach | Nikolai Binev | |
| Nyla Olson | 莱斯利·史蒂芬森
 | |
| Shelly Klein | 爱米·格拉汉姆
 | |
| Abell (as Stu Charno) | Stuart Charno | |
| Grisham | Carl Lewis | |
| Dacia | Svetla Vasileva | |
| Pilot | Anthony Crivello | |
| Co-Pilot (as Kaloyan Vodenicharov) | Kaloian Vodenicharov | |
| Airman | George Stanchev | |
| Navigator | Rufus Dorsey | |
| Dr. John Bachman | 罗伊·多奇斯
 | |
| Sam | Woody Schultz | |
| First Man (as Ronald Krauss) | Ron Krauss | |
| Second Man (as William Skinner) | William Ladd Skinner | |
| Third Man (as Franklin Vallette) | Franklin A. Vallette | |
| Fourth Man | Hristo Aleksandrov | |
| Falkland Man #1 (as Ross Clarkson) | Ross W. Clarkson
 | |
| Falkland Man #2 | Willie Botha | |
| Kitt Peak Man #1 (as Tyron Pinkam) | Tyrone Pinkham | |
| Kitt Peak Man #2 | Atanas Srebrev | |
| Copeland | Joel Polis
 | |
| Secretary Bayer | Keir Dullea
 | |
| Gordon Osler | Bert Emmett | |
| Reporter (as Mariana Stanisheva) | Marianne Stanicheva | |
| Kapitan Sokolov | Dobrin Dosev | |
| Xo Volkov (as Atanas Atanasov) | Atanas Atanasow | |
| Navigator Petrenko | Hristo Shopov | |
