| William Jordan | ... | Major Jake Gatlin | |
| Caskey Swaim | ... | Staff Sergeant Harry Fitz | |
| Jim Davis | ... | Earl Clay | |
| BarBara Luna | ... | Helen Ramirez (as Barbara Luna) | |
| Mills Watson | ... | Barney Tomlinson | |
| David Yanez | ... | Pauley Ramirez | |
| Colby Chester | ... | Jim | |
| Parley Baer | ... | Tom Fairly | |
| Olan Soule | ... | George La Tourette | |
| Bill McLean | ... | Lew | |
| Bert Holland | ... | Al Henshaw | |
| C. Lindsay Workman | ... | Benjamin Talbot, M.D. (as Lindsay Workman) | |
| Sean Kelly | ... | Mark |
| Episode Crew |
Directed by | |||
| Robert M. Leeds | (as Robert Leeds) | ||
Writing credits(in alphabetical order) | ||
| Harold Jack Bloom | writer | |
Cinematography by | |||
| Robert Wyckoff | (director of photography) | ||
Film Editing by | |||
| Michael Berman | |||
Art Department | |||
| Ron Greenwood | .... | leadman | |
| Joe Olsen | .... | prop man | |
Visual Effects by | |||
| Bill Hansard | .... | visual effects advisor | |
| Brick Price | .... | spacecraft | |
| William Stark | .... | visual effects supervisor (as Wm. Stark) | |
Editorial Department | |||
| Daniel T. Cahn | .... | assistant editor (as Daniel Cahn) | |
| Series Crew These people are regular crew members. Were they in this episode? |
Directed by | |||
| Jack Webb | |||
Writing credits(in alphabetical order) | ||
| Dirk Wayne Summers | writer | |
| Jack Webb | creator | |
Produced by | |||
| William T. Coleman | .... | producer | |
| Gene Levitt | .... | executive producer | |
| Jack Webb | .... | executive producer | |
| Michael Friedman | .... | associate producer (uncredited) | |
Visual Effects by | |||
| Tim Donahue | .... | visual effects artist: Film Effects of Hollywood | |
Stunts | |||
| Tom Elliott | .... | stunts | |
| Hubie Kerns Jr. | .... | stunts | |
Camera and Electrical Department | |||
| Joseph Cosko Jr. | .... | second assistant camera | |
Music Department | |||
| Daniel J. Johnson | .... | music editor | |
Other crew | |||
| Art Scholl | .... | pilot | |
| Main series | Episode guide | Full cast and crew |
| Company credits | IMDb TV section | IMDb Sci-Fi section |