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George Segal as Harry Benson |
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Joan Hackett as Dr. Janet Ross |
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Richard Dysart as Dr. John Ellis |
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Donald Moffat as Dr. Arthur McPherson |
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Michael C. Gwynne as Dr. Robert Morris |
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William Hansen as Dr. Ezra Manon |
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Jill Clayburgh as Angela Black |
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Norman Burton as Det. Capt. Anders |
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James B. Sikking as Ralph Friedman |
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Matt Clark as Gerhard |
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Jim Antonio as Richards |
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Steve Kanaly as Edmonds |
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Al Checco as Farley |
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Gene Borkan as Benson's Guard |
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Burke Byrnes as Benson's Guard |
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Fred Sadoff as Police Doctor |
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Robert Ito as Anesthetist |
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Jason Wingreen as Instructor |
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Jack Colvin as Detective |
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Jordan Rhodes as First Questionnaire |
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Ian Wolfe as Priest |
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Dee Carroll as Night Nurse |
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Rutanya Alda as Nurse |
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Lee de Broux as Reporter |
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George Holmes as Reporter |
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Michael Jeffers as Reporter |
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Joe Pine as Reporter |
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Bob Harks as Orderly |
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Victor Argo as Orderly |
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Clark Ross as Orderly |
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Michael Santiago as Orderly |
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Nicholas Worth as Orderly |
| Writing | Michael Crichton | Novel |
| Writing | Mike Hodges | Screenplay |
| Directing | Mike Hodges | Director |
| Sound | Glenn Gould | Musician |
| Editing | Robert L. Wolfe | Editor |
| Costume & Make-Up | Donald Brooks | Costume Design |
| Art | Marvin March | Set Decoration |
| Costume & Make-Up | Fred Williams | Makeup Artist |
| Production | Mike Hodges | Producer |
| Costume & Make-Up | Sherry Wilson | Hairstylist |
| Costume & Make-Up | Vittorio Nino Novarese | Costume Design |
| Production | Bruce Fowler Jr. | Production Manager |
| Directing | Margaret Tary | Script Supervisor |
| Art | Fred Harpman | Art Direction |
| Costume & Make-Up | Leo Lotito Jr. | Makeup Artist |
| Production | Michael Dryhurst | Associate Producer |
| Production | Nessa Hyams | Casting |
| Camera | Richard H. Kline | Director of Photography |
| Crew | Ron Riner | Driver |
| Art | Herb Rindenow | Leadman |
| Directing | Robert Dijoux | Second Assistant Director |
| Sound | Raul A. Bruce | Boom Operator |
| Production | Jim Martell | Extras Casting |
| Camera | Al Baerthlin | Assistant Camera |
| Camera | Mel Traxel | Still Photographer |
| Production | R. Anthony Brown | Location Manager |
| Production | Dorothy Naja | Production Secretary |
| Directing | Leonard S. Smith Jr. | Second Assistant Director |
| Editing | Joel Cox | Assistant Editor |
| Editing | Jeremy Hume | Assistant Editor |
| Camera | Edward Morey III | Second Assistant Camera |
| Camera | Ronald Vidor | First Assistant Camera |
| Costume & Make-Up | Charles E. James | Wardrobe Master |
| Art | Harold Broner | Construction Coordinator |
| Lighting | Wilbur Kinnett | Gaffer |
| Costume & Make-Up | Edna Taylor | Wardrobe Master |
| Crew | Loren Janes | Stunts |
| Camera | Albert Bettcher | Camera Operator |
| Sound | Dan Wallin | Scoring Mixer |
| Sound | William Randall Jr. | Sound |
| Costume & Make-Up | Tye Osward | Wardrobe Master |
| Production | Vernon White | Publicist |
| Directing | Dick Moder | First Assistant Director |
| Crew | Douglas Pettibone | Special Effects |
| Production | Kay Hoff | Production Secretary |
| Art | Willie Wiles | Assistant Property Master |
| Sound | Hugh Strain | Sound Mixer |
| Crew | William Koselka | Technical Advisor |
| Art | Marty Wunderlich | Property Master |
| Camera | Kenneth Adams | Key Grip |
| Crew | Glenn Dunn | Craft Service |
| Sound | Nicholas Stevenson | Sound Editor |
| Sound | Charles Randall | Boom Operator |
