Trailer
Images
 | Rock Hudson as Dr. Anton Drager |
 | Burl Ives as Dr. Brits Jansen |
 | Gena Rowlands as Els |
 | Geoffrey Keen as Willem Wattereus |
 | Neva Patterson as Louise Kramer |
 | Will Kuluva as Dr. Sordjano |
 | Philip Abbott as Frolick |
 | Larry Gates as Dr. Kramer |
 | Karl Swenson as Insp. Bevers |
 | Edgar Stehli as The Sultan |
 | Judy Dan as Laja |
 | Robert F. Simon as Dr. Martens |
 | Reggie Nalder as Burubi |
 | Ibrahim Pendek as Stegomyia |
 | Leon Lontoc as Dr. Hatta |
 | David Lewis as Maj. Vlormans |
 | Parley Baer as Mr. Boosmans |
 | Fredd Wayne as Van Bloor |
 | Leslie Bradley as Krasser |
 | Barbara Morrison as Mrs. Boosmans |
 | Martin Brandt as Dr. Sander |
| Writing | |
| Jan de Hartog | Novel |
| John Lee Mahin | Screenplay |
| Neil Paterson | Screenplay |
Production | |
| Robert Arthur | Producer |
Camera | |
| Russell Harlan | Director of Photography |
Editing | |
| Russell F. Schoengarth | Editor |
Art | |
| Henry Bumstead | Art Direction |
| Alexander Golitzen | Art Direction |
| Oliver Emert | Set Decoration |
Costume & Make-Up | |
| Rosemary Odell | Costume Design |
| Larry Germain | Hairstylist |
| Bud Westmore | Makeup Artist |
Production | |
| Richard McWhorter | Unit Production Manager |
Editing | |
| Joseph E. Kenney | Assistant Editor |
Sound | |
| Joe Lapis | Sound |
| Waldon O. Watson | Sound |
Directing | |
| Robert Mulligan | Director |
Sound | |
| Joseph Gershenson | Music Supervisor |
Crew | |
| John Datu | Technical Advisor |
Visual Effects | |
| Pacific Title | Visual Effects |
Crew | |
| Bob Herron | Stunts |
Sound | |
| Jerry Goldsmith | Original Music Composer |
