Directed by
| Clive Donner | ||
Writing Credits
| Gene Roddenberry | ... | (screenplay by) and |
| Samuel A. Peeples | ... | (screenplay by) |
| Gene Roddenberry | ... | (based on an original story by) |
Cast (in credits order)
| Robert Culp | ... | William Sebastian | |
| Gig Young | ... | Dr. Ham Hamilton | |
| John Hurt | ... | Mitri Cyon | |
| Gordon Jackson | ... | Inspector Cabell | |
 |
Ann Bell | ... | Anitra Cyon |
| James Villiers | ... | Sir Geoffrey Cyon | |
| Majel Barrett | ... | Lilith | |
| Jenny Runacre | ... | Sydna | |
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Angela Grant | ... | Butler |
| Penny Irving | ... | First Maid | |
| Vicki Michelle | ... | Second Maid | |
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Lindy Benson | ... | Third Maid |
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Sally Farmiloe | ... | Fourth Maid |
| Michael Latimer | ... | Co-pilot | |
| Rest of cast listed alphabetically: | |||
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Stephen Calcutt | ... | Ritual Attendee (uncredited) |
| Carl Rigg | ... | Policeman (uncredited) | |
| Kim Schmidt | ... | Police Woman (uncredited) | |
Produced by
| Gene Roddenberry | ... | executive producer |
| Gordon Scott | ... | producer (as Gordon L.T. Scott) |
| Danny Steinmann | ... | associate producer |
Music by
| John Cameron | ||
Cinematography by
| Arthur Ibbetson | ... | director of photography |
Editing by
| Peter Tanner | ||
Art Direction by
| Albert Witherick | ||
Costume Design by
| Judy Moorcroft | ||
Makeup Department
| Graham Freeborn | ... | makeup artist |
| Kay Freeborn | ... | makeup artist |
| Stuart Freeborn | ... | makeup artist |
| Nick Maley | ... | special makeup effects crew |
Second Unit Director or Assistant Director
| Ken Baker | ... | assistant director |
| John Downes | ... | assistant director |
Art Department
| Terry Wells | ... | stand-by property master |
| Barry Wilkinson | ... | stand-by props |
Sound Department
| Claude Hitchcock | ... | sound recordist |
Stunts
| Peter Diamond | ... | stunts (uncredited) |
Camera and Electrical Department
| Freddie Cooper | ... | camera operator |
| John Jay | ... | still photographer |
Costume and Wardrobe Department
| Babs Gray | ... | Wardrobe Mistress |
| Keith Morton | ... | wardrobe assistant |
Script and Continuity Department
| Gladys Goldsmith | ... | script supervisor |
Additional Crew
| Bill Finch | ... | production accountant |
| Stuart Freeborn | ... | creature designer |
| Jean Garioch | ... | publicist |
| Linda Nettleton | ... | producer's secretary |
| Monica Rogers | ... | production assistant |
