| Walter Brooke | ... | Gen. Samuel T. Merritt | |
| Eric Fleming | ... | Capt. Barney Merritt | |
| Mickey Shaughnessy | ... | Sgt. Mahoney | |
| Phil Foster | ... | Jackie Siegle | |
| William Redfield | ... | Roy Cooper | |
| William Hopper | ... | Dr. George Fenton | |
| Benson Fong | ... | Imoto | |
| Ross Martin | ... | Andre Fodor | |
| Vito Scotti | ... | Sanella | |
| John Dennis | ... | Donkersgoed | |
| Michael Fox | ... | Elsbach | |
| Joan Shawlee | ... | Rosie McCann | |
| Iphigenie Castiglioni | ... | Mrs. Heinz Fodor | |
| rest of cast listed alphabetically: | |||
| Dan Barton | ... | Crewman (uncredited) | |
| Kei Thin Chung | ... | Japanese Replacement (uncredited) | |
| Rosemary Clooney | ... | Musical Number (archive footage) (uncredited) | |
| Don Dunning | ... | Replacement Soldier (uncredited) | |
| Fred Essler | ... | Assistant Station Announcer (uncredited) | |
| Rand Harper | ... | Rocket Pilot (uncredited) | |
| Maurice Hart | ... | Radio Announcer (uncredited) | |
| Jack Iversen | ... | American Soldier (uncredited) | |
| Mike Mahoney | ... | Operator (uncredited) | |
| John Mansfield | ... | Turkish Soldier (uncredited) | |
| George Marshall Jr. | ... | Soldier (uncredited) | |
| Neyle Morrow | ... | Crewman (uncredited) | |
| Harvey Parry | ... | Crewman (uncredited) | |
| Tom Selden | ... | Officer (uncredited) | |
| Richard Shannon | ... | Crewman (uncredited) | |
| Bob Templeton | ... | Crewman (uncredited) | |
| David Vaile | ... | Announcer (uncredited) | |
| Jamieson Ward | ... | Crewman (uncredited) | |
Directed by | |||
| Byron Haskin | |||
Writing credits | ||
| Chesley Bonestell | (book) and | |
| Willy Ley | (book) | |
| Philip Yordan | (adaptation) and | |
| Barré Lyndon | (adaptation) and | |
| George Worthing Yates | (adaptation) | |
| James O'Hanlon | ||
| Wernher von Braun | book "Mars Project" (uncredited) | |
Produced by | |||
| Frank Freeman Jr. | .... | associate producer | |
| George Pal | .... | producer | |
Original Music by | |||
| Van Cleave | |||
Cinematography by | |||
| Lionel Lindon | (director of photography) | ||
Film Editing by | |||
| Everett Douglas | |||
Art Direction by | |||
| J. McMillan Johnson | (as Joseph MacMillan Johnson) | ||
| Hal Pereira | |||
Set Decoration by | |||
| Sam Comer | |||
| Frank R. McKelvy | (as Frank McKelvy) | ||
Makeup Department | |||
| Wally Westmore | .... | makeup supervisor | |
Production Management | |||
| C. Kenneth Deland | .... | production manager (uncredited) | |
Second Unit Director or Assistant Director | |||
| Daniel McCauley | .... | assistant director | |
Art Department | |||
| Chesley Bonestell | .... | astronomical art | |
Sound Department | |||
| Gene Garvin | .... | sound | |
| Harold Lewis | .... | sound | |
| Ralph Hickey | .... | sound editor (uncredited) | |
| Carl Mahakian | .... | sound editor (uncredited) | |
Visual Effects by | |||
| Ivyl Burks | .... | special photographic effects | |
| Jan Domela | .... | special photographic effects | |
| Farciot Edouart | .... | process photography | |
| John P. Fulton | .... | special photographic effects | |
| Paul K. Lerpae | .... | special photographic effects (as Paul Lerpae) | |
| Irmin Roberts | .... | special photographic effects | |
Music Department | |||
| Sidney Cutner | .... | orchestrator (uncredited) | |
| Maurice De Packh | .... | orchestrator (uncredited) | |
| Gil Grau | .... | orchestrator (uncredited) | |
| Leo Shuken | .... | orchestrator (uncredited) | |
Other crew | |||
| Richard Mueller | .... | technicolor color consultant | |
| Robert S. Richardson | .... | technical advisor (uncredited) | |
| Wernher von Braun | .... | technical advisor (uncredited) | |
| Dorothy Yutzi | .... | script supervisor (uncredited) | |
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| Solaris | Planet of the Apes | Apollo 13 | Contact | Sunshine |
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| Full cast and crew | Company credits | External reviews |
| News articles | IMDb Sci-Fi section | IMDb USA section |
Although not the caliber of Pal's earlier space operas, "Conquest of Space" is still highly enjoyable. Besides the unique experience of viewing our future through the eyes of our past, it's interesting to see how many things they got right (and wrong) about space exploration. One of the most interesting devices, especially in light of the International Space Station, whose construction is supposed to commence in 1998, is "The Circle" a rotating, doughnut-shaped space station circling the earth, that is the main setting for the first half of the film. Along side The Circle is being built an enormous rocket ship that resembles a Northrop Flying Wing with a V-2 rocket strapped on it's back.
Sadly, Pal's special effects budget was cut short on this project leaving him somewhat short ended on the spectacle. All in all, however, this film is well worth a look.