| Photos (see all 23 | slideshow) | Videos |
| Stephen Boyd | ... | Grant | |
| Raquel Welch | ... | Cora | |
| Edmond O'Brien | ... | General Carter | |
| Donald Pleasence | ... | Dr. Michaels | |
| Arthur O'Connell | ... | Col. Donald Reid | |
| William Redfield | ... | Capt. Bill Owens | |
| Arthur Kennedy | ... | Dr. Duval | |
| Jean Del Val | ... | Jan Benes | |
| Barry Coe | ... | Communications Aide | |
| Ken Scott | ... | Secret Service | |
| Shelby Grant | ... | Nurse | |
| James Brolin | ... | Technician | |
| Brendan Fitzgerald | ... | Wireless Operator | |
| rest of cast listed alphabetically: | |||
| Brendon Boone | ... | MP (uncredited) | |
| Kenneth MacDonald | ... | Henry - Heart Monitoring (uncredited) | |
| Christopher Riordan | ... | Young Scientist (uncredited) | |
Directed by | |||
| Richard Fleischer | |||
Writing credits | ||
| Harry Kleiner | (screenplay) | |
| David Duncan | (adaptation) | |
| Otto Klement | (story) and | |
| Jerome Bixby | (story) (as Jay Lewis Bixby) | |
Produced by | |||
| Saul David | .... | producer | |
Original Music by | |||
| Leonard Rosenman | |||
Cinematography by | |||
| Ernest Laszlo | (director of photography) | ||
Film Editing by | |||
| William B. Murphy | |||
Art Direction by | |||
| Dale Hennesy | |||
| Jack Martin Smith | |||
Set Decoration by | |||
| Stuart A. Reiss | |||
| Walter M. Scott | |||
Makeup Department | |||
| Margaret Donovan | .... | hair stylist | |
| Ben Nye | .... | makeup artist | |
Production Management | |||
| Eric Stacey | .... | unit production manager | |
Second Unit Director or Assistant Director | |||
| Ad Schaumer | .... | assistant director | |
Sound Department | |||
| David Dockendorf | .... | sound | |
| Bernard Freericks | .... | sound | |
| Walter Rossi | .... | sound effects (uncredited) | |
| Richard Sperber | .... | sound effects editor (uncredited) | |
Special Effects by | |||
| L.B. Abbott | .... | special photographic effects | |
| Art Cruickshank | .... | special photographic effects | |
| Emil Kosa Jr. | .... | special photographic effects | |
| Greg C. Jensen | .... | special effects (uncredited) | |
Visual Effects by | |||
| Marcel Delgado | .... | miniatures (uncredited) | |
Stunts | |||
| Donna Garrett | .... | stunts (uncredited) | |
| Sol Gorss | .... | stunts (uncredited) | |
Transportation Department | |||
| Chris Haynes | .... | driver (uncredited) | |
Other crew | |||
| Peter Foy | .... | technical adviser: flying sequences | |
| Harper Goff | .... | creative production research | |
| Richard Kuhn | .... | titles | |
| Fred Zendar | .... | technical adviser | |
| Marie Kenney | .... | script supervisor (uncredited) | |
| Christopher Riordan | .... | leg double: Steven Boyd (uncredited) | |
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To answer everyone's question about how did Issac Asimov resolve the Proteus issue at the end of the movie; in his novelization of the film (which is a very good sci-fi book on its own), the sub comes out with everyone else in the teardrop along with "a very surprised white blood cell." The scene with Donald Pleasance gave me chills when I saw it as a child and having recently seen it again, it still is creepy. I think this is due to Pleasance's performance more than anything else. I do have to say that seeing Stephen Boyd being driven around the LA Sports Center (subbing for the top secret research center; they had to have everything removed by 5:30 in the afternoon the week they filmed there because sporting events were going on at night) in a golf cart seemed a bit silly but I guess that showed how important he was. With these kinds of films, one has to ignore all certain types of questions about how come this did or didn't happen when the scientists did this and just relax and enjoy it.