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Louis Jourdan as Dr. David Sorell |
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Lynda Day George as Barbara Anholt (as Lynda Day) |
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Carroll O'Connor as Myles Donovan |
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Bradford Dillman as Paul Varney |
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Wilfrid Hyde-White as Harry Snowden |
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Marsha Hunt as Mrs. Varney |
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Katherine Woodville as Ingrid Dorne (as Katharine Woodville) |
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Harry Davis as Mr. Wyant |
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Ivor Barry as Lecturer |
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Jeanne Buckley as Miss Bamett |
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Robert Sampson as First Party Guest |
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Lyn Peters as Second Party Guest |
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Susan Brown as Third Party Guest |
| Writing | Richard Alan Simmons | Writer |
| Directing | Paul Wendkos | Director |
| Writing | Guy Endore | Story |
| Camera | Andrew J. McIntyre | Director of Photography |
| Sound | Billy Goldenberg | Original Music Composer |
| Production | Richard Alan Simmons | Producer |
| Production | David Levinson | Associate Producer |
| Editing | Byron Chudnow | Editor |
| Editing | Richard Belding | Supervising Editor |
| Art | Howard E. Johnson | Art Direction |
| Art | John McCarthy Jr. | Set Decoration |
| Art | Joseph J. Stone | Set Decoration |
| Costume & Make-Up | Bud Westmore | Makeup Artist |
| Costume & Make-Up | Larry Germain | Hairstylist |
| Production | George Lollier | Unit Manager |
| Sound | Denvil L. Daniels | Sound |
| Directing | Kenny Williams | Assistant Director |
| Costume & Make-Up | Helen Colvig | Costumer |
| Sound | Stanley Wilson | Music Supervisor |
