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Lloyd Bridges as Charlie Englehardt |
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Jeremy Slate as Astronaut Capt. Rick Lawrence |
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Jim McMullan as Astronaut Ben Pelham |
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Morgan Paull as Astronaut Dave Anderson |
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Michael Link as Eli 'E.J.' Mackernutt, Jr. |
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John Carradine as Jacob Avril |
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Jack Callahan as Dr. Jack Smathers |
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Charles Conrad as Himself |
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Walter Brooke as Whitehead |
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Keene Curtis as Tom Estes |
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Edward Faulkner as Eli Mackernutt, Sr. |
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Jon Cedar as Hans Hartman |
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Barbara Faulkner as Mrs. Mary Mackernutt |
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Stephen Rogers as Joey Williams |
| Writing | Jon Boothe | Writer |
| Directing | Andrew V. McLaglen | Director |
| Art | Allen E. Smith | Art Direction |
| Sound | Patrick Williams | Original Music Composer |
| Camera | J.J. Jones | Director of Photography |
| Production | John Cutts | Producer |
| Editing | John F. Schreyer | Editor |
| Writing | William R. Shelton | Novel |
| Production | Carl Kugel | Associate Producer |
| Production | Maurie M. Suess | Unit Production Manager |
| Production | Mark Evans | Production Supervisor |
| Art | Robert De Vestel | Set Decoration |
| Sound | Lionel Newman | Music Supervisor |
| Crew | Joe Zomar | Special Effects |
| Production | Jack Baur | Casting |
| Crew | Joseph Silver | Post Production Supervisor |
| Directing | Jack Barry | Assistant Director |
| Crew | Joe W. Schmitt | Technical Advisor |
