 | Stephen Boyd als Grant |
 | Raquel Welch als Cora |
 | Edmond O'Brien als General Carter |
 | Donald Pleasence als Dr. Michaels |
 | Arthur O'Connell als Col. Donald Reid |
 | William Redfield als Capt. Bill Owens |
 | Arthur Kennedy als Dr. Duval |
 | Jean Del Val als Jan Benes |
 | Barry Coe als Communications Aide |
 | Ken Scott als Secret Service |
 | Shelby Grant als Nurse |
 | James Brolin als Technician |
 | Brendan Fitzgerald als Wireless Operator |
 | Brendon Boone als Military Policeman (uncredited) |
 | James Doohan als Dr. Sawyer (Hypothermia technician) (uncredited) |
 | Kenneth MacDonald als Henry - Heart Monitoring (uncredited) |
 | Christopher Riordan als Young Scientist (uncredited) |
| Ernest Laszlo | Director of Photography |
| Jack Martin Smith | Art Direction |
| Stuart A. Reiss | Set Decoration |
| Otto Klement | Story |
| Leonard Rosenman | Original Music Composer |
| Walter M. Scott | Set Decoration |
| David Duncan | Adaptation |
| Richard Fleischer | Director |
| Saul David | Producer |
| William B. Murphy | Editor |
| Jerome Bixby | Story |
| Dale Hennesy | Art Direction |
| Harry Kleiner | Screenplay |
| Margaret Donovan | Hairstylist |
| Eric Stacey | Unit Production Manager |
| Ben Nye | Makeup Artist |
| Bernard Freericks | Sound |
| Art Cruickshank | Special Effects |
| Harper Goff | Researcher |
| Emil Kosa Jr. | Special Effects |
| Peter Foy | Aerial Coordinator |
| Ad Schaumer | Assistant Director |
| Fred Zendar | Technical Advisor |
| L.B. Abbott | Special Effects |
| Richard Kuhn | Title Designer |
| David Dockendorf | Sound |
| Walter Rossi | Sound Effects |
