| Andrew Craig | 保罗·纽曼
 | |
| Inger Lisa Andersson | 艾尔克·萨默
 | |
| Dr. Max Stratman/Prof. Walter Stratman | 爱德华·罗宾逊
 | |
| Emily Stratman | 黛安·贝克
 | |
| Dr. Denise Marceau | 米谢琳·普雷斯勒
 | |
| Dr. Claude Marceau | 杰拉尔·乌里
 | |
| Dr. John Garrett | 凯文·麦卡锡
 | |
| Daranyi Dark Henchman (as Sacha Pitoeff) | 莎查·皮托夫
 | |
| American Reporter (uncredited) | 安娜·李
 | |
| Dr. Carlo Farelli | Sergio Fantoni | |
| Count Bertil Jacobsson | Leo G. Carroll
 | |
| Monique Souvir Dr. Claude's 'Secretary' | Jacqueline Beer | |
| Hans Eckhart | John Wengraf | |
| Ivar Cramer Light Henchman | Don Dubbins | |
| Mrs. Bergh Chaperon | Virginia Christine | |
| Mr. Bergh Chaperon | Rudolph Anders | |
| Saralee Garrett | Martine Bartlett
 | |
| Hilding (Welcome Basket) | Karl Swenson | |
| Oscar (Welcome Basket) | John Qualen | |
| Clark Wilson U.S. Ambassador | Ned Wever | |
| Davis Garrett (uncredited) | Larry Adare | |
| Amy Garrett (uncredited) | Robin Adare | |
| German correspondent (uncredited) | John Banner | |
| Oscar Lindblom Dead Make-up Artist (uncredited) | Sven Hugo Borg | |
| Swedish Man (uncredited) | Peter Bourne | |
| Steen Ekberg (Airport) (uncredited) | Martin Brandt | |
| Deck Hand (uncredited) | Paul Busch | |
