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Robert Foxworth as Questor |
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Mike Farrell as Jerry Robinson |
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John Vernon as Geoffrey Darro |
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Lew Ayres as Vaslovik |
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James Shigeta as Dr. Chen |
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Robert Douglas as Dr. Michaels |
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Dana Wynter as Lady Helena Trimble |
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Ellen Weston as Allison Sample |
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Majel Barrett as Dr. Bradley |
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Reuben Singer as Dr. Gorlov |
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Walter Koenig as Administrative Assistant |
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Fred Sadoff as Dr. Audret |
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Gerald Peters as Randolph |
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Eyde Girard as Stewardess |
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Alan Caillou as Immigration Offical |
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Lal Baum as Col. Hendricks |
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Patti Cubbison as Secretary |
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Ian Abercrombie as Charlie |
| Directing | Richard A. Colla | Director |
| Writing | Gene Roddenberry | Teleplay |
| Writing | Gene Roddenberry | Story |
| Writing | Gene L. Coon | Teleplay |
| Production | Howie Horwitz | Producer |
| Sound | Gil Mellé | Original Music Composer |
| Crew | Michael D. Margulies | Cinematography |
| Editing | Robert L. Kimble | Editor |
| Editing | J. Terry Williams | Editor |
