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Stuart Whitman as Dale Nelson / Arthur |
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Carol Lynley as Cynthia Lee Albright |
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Roddy McDowall as Martin Ashley |
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Lauren Bacall as Dr. Edwina Beighley |
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Olive Deering as Mrs. Mellon |
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Ossie Davis as Capshaw |
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Donald Buka as Psychologist |
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Paulene Myers as Dr. Walden (as Pauline Myers) |
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Evadne Baker as Intern |
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Robert J. Wilke as Technician Mike Newton (as Robert Wilke) |
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Bert Freed as Frank Josephson |
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Judith De Hart as Matron |
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Judson Laire as Harley Manning |
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Jonathan Gilmore as A Young Mental Patient |
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Templeton Fox as Miss Lindsey |
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William Douglas as Paranoid Patient |
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Merritt Bohn as Jury Foreman |
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Don Marshall as Singer |
| Directing | Denis Sanders | Director |
| Writing | Sydney Boehm | Screenplay |
| Writing | Winfred Van Atta | Novel |
| Production | Aaron Rosenberg | Producer |
| Crew | Sam Leavitt | Cinematography |
| Editing | Louis R. Loeffler | Editor |
| Art | Hilyard M. Brown | Art Direction |
| Art | Jack Martin Smith | Art Direction |
| Art | Paul S. Fox | Set Decoration |
| Art | Walter M. Scott | Set Decoration |
| Costume & Make-Up | Moss Mabry | Costume Design |
| Costume & Make-Up | Margaret Donovan | Hairstylist |
| Costume & Make-Up | Ben Nye | Makeup Artist |
| Costume & Make-Up | Harry Maret | Makeup Artist |
| Costume & Make-Up | Mary Westmoreland | Hairstylist |
| Directing | Joseph E. Rickards | Assistant Director |
| Directing | Ad Schaumer | Assistant Director |
| Art | Ed Jones | Props |
| Sound | Robert O'Brien | Sound |
| Sound | Elmer Raguse | Sound |
| Crew | L.B. Abbott | Special Effects |
| Crew | Emil Kosa Jr. | Special Effects |
| Lighting | Kenneth Lang | Gaffer |
| Camera | Lou Pazelli | Key Grip |
| Camera | Frank Powolny | Still Photographer |
| Costume & Make-Up | Ollie Hughes | Wardrobe Master |
| Costume & Make-Up | Wesley Trist | Wardrobe Master |
| Directing | Teresa Brachetto | Script Supervisor |
| Crew | Harold Goodwin | Dialogue Coach |
| Sound | Jerry Goldsmith | Original Music Composer |
