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John Saxon as Capt. Anthony Vico |
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Kathleen Miller as Dr. Allison Crowley |
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Keene Curtis as Dr. William Scott |
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James Olson as Surgeon |
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Martine Beswick as Tana |
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Reb Brown as Sprang |
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Ford Rainey as Sirus |
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Bill McKinney as Badger |
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Gerrit Graham as Daniel |
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Catherine Bach as Lara, the Guide |
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Cynthia Wood as Arana |
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Norland Benson as Hide |
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Richard Farnsworth as Elder |
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Lawrence Greenstein as Mutant (uncredited) |
| Directing | Robert Butler | Director |
| Writing | Ranald Graham | Writer |
| Writing | Walon Green | Writer |
| Writing | Al Ramrus | Writer |
| Production | Ranald Graham | Executive Producer |
| Production | Walon Green | Executive Producer |
| Sound | Richard Clements | Music |
| Sound | Elliot Kaplan | Music |
| Production | Bob Larson | Producer |
| Production | Ric Rondell | Associate Producer |
| Camera | Michael D. Margulies | Director of Photography |
| Editing | David Newhouse | Editor |
| Editing | Melvin Shapiro | Editor |
| Art | Jack Martin Smith | Art Direction |
| Production | Hoyt Bowers | Casting |
| Writing | Gene Roddenberry | Idea |
